Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/biomimetics9030133

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.32604/cmes.2024.049694

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

<p>In this study, we propose a new feedback control model for insect flight maneuverability, and conduct the numerical analysis using the proposed model. In the proposed model, the feedback control based on the observation for actual insects is introduced to the partitioned analysis model for the wing-body interaction, where the flapping wings and the surrounding air flow coupling is monolithically formulated using a finite element method such that the wing’s characteristic motions are simulated stably, while the one-way coupling from the wings to the body is used assuming a perturbation from the quasi-steady flight state. The roll control, on which we focus here, in our numerical result shows the good agreement with the body’s attitude control of an actual insect observed in the previous experiment. In our future work, we will elucidate a maneuverability mechanism of controlling body’s attitudes in insect flapping flight using the proposed model.</p>

DOI： 10.15748/jasse.11.201

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jasse/11/1/11_201/_pdf

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/NEMS60219.2024.10639876

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/biomimetics8080571

Scopus

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1002/fld.5251

Scopus

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/MEMS49605.2023.10052580

Kyutacar

Scopus

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.32604/cmes.2023.024614

Scopus

CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1007/s10999-022-09635-4

Scopus

CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1080/15502287.2022.2066032

Kyutacar

Scopus

CiNii Research

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>In a micro piezoelectric drive system for insect-mimetic flapping wing nano air vehicles, a small translational displacement of the piezoelectric bimorph is converted to a large angular displacement using a transmission based on the geometric nonlinearity of large bending of the elastic hinges. The piezoelectric bimorph and the transmission strongly interact with each other due to the scale effect. Furthermore, in the piezoelectric bimorph, the direct and inverse piezoelectric effects are coupled with each other. Hence, in the micro piezoelectric drive system, the direct-piezoelectric, inverse-piezoelectric, and structural coupling occurs. In this study, a finite element analysis method based on the block successive under-relaxation method is proposed for the dynamic analysis of this triply coupled phenomena, and the dependency of the convergence property on the relaxation coefficient is investigated.</p>

DOI： 10.1299/jsmecmd.2023.36.os-0202

CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1080/15502287.2023.2291013

Kyutacar

Scopus

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1080/19942060.2023.2271053

Scopus

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmebiofro.2023.34.1f10

CiNii Research

Other Link： https://www.jstage.jst.go.jp/article/jsmebiofro/2023.34/0/2023.34_1F10/_pdf

Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Language：Japanese   Publishing type：Research paper (other academic)

Language：Japanese   Publishing type：Research paper (other academic)

Language：Japanese   Publishing type：Research paper (other academic)

Language：Japanese   Publishing type：Research paper (other academic)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Last author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)

Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/NEMS54180.2022.9791094

Kyutacar

Scopus

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.3390/fluids7010026

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

<p>This study proposed a partitioned method with a feedback control to analyzed maneuvering of insects during flapping flight. This method decomposed the insect flapping flight into wing and body subsystems and then coupled them using feedback control. In the wing subsystem, the strong coupling of the flexible wings and surrounding fluid was accurately analyzed using the finite element method to obtain the thrust forces acting on the insect’s body. The resulting thrust forces were passed from the wing subsystem to the body subsystem, and then rigid body motion was analyzed in the body subsystem. The controlling of wing subsystem is done by the feedback control using the body angular displacement and velocity. The fundamental performance of the proposed method is demonstrated from the comparison between the present results and the actual observation of maneuver.</p>

DOI： 10.1299/jsmecmd.2022.35.12-07

CiNii Research

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1088/2631-8695/ac2bf0

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.compstruc.2021.106572

Scopus

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Language：Japanese   Publishing type：Research paper (other academic)

日本   北九州市   2021.05.26  -  2021.05.28

Language：Japanese   Publishing type：Research paper (other academic)

日本   北九州市   2021.05.26  -  2021.05.28

Language：Japanese   Publishing type：Research paper (other academic)

日本   北九州市   2021.05.26  -  2021.05.28

Language：Japanese   Publishing type：Research paper (other academic)

日本   北九州市   2021.05.26  -  2021.05.28

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/NEMS51815.2021.9451440

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.15748/jasse.8.163

CiNii Article

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Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.23967/wccm-eccomas.2020.163

Scopus

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Language：Japanese   Publishing type：Research paper (scientific journal)

<p>　Heating analysis of CFRP and carbon fiber dry cloth for aircraft structures, which is expected for a medium-sized aircraft, is performed. Comparing the temperature of test pieces between numerical and experimental results, validity of both experimental and analytical methods is confirmed for both aluminum and carbon dry cloth sheet. Analysis is made for the layers of carbon dry cloth sheet and CFRTP plate.</p>

DOI： 10.14243/jsaem.29.576

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130008142891

Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/ICRAE53653.2021.9657802

Kyutacar

Scopus

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>In recent years, energy harvesting from environment has attracted much attention. In particular, piezoelectric bimorph energy harvesters, which are effective as an energy source for MEMS, have been widely studied. In piezoelectric energy harvesters, structure, piezoelectricity, and circuit are strongly coupled in a complicated and hierarchical manner. For the three-field coupling phenomena, unlike two-field coupling phenomena, various partitioned algorithms are possible. Hence, in this study, we develop three partitioned algorithms using hierarchical decomposition: In the first algorithm, all fields are solved implicitly or strongly coupled using the block Gauss-Seidel (BGS) method (fully strong coupling algorithm). In the second algorithm, the structure-piezoelectric interaction is solved implicitly or strongly coupled using the BGS method, and the circuit is solved explicitly or weakly coupled (partially strong coupling algorithm). In the third algorithm, all fields are solved explicitly or weakly coupled (fully weak coupling algorithm). These methods are applied to a typical piezoelectric harvester, namely a cantilevered piezoelectric bimorph, and their performances such as the accuracy and the computational cost are discussed.</p>

DOI： 10.1299/jsmecmd.2021.34.210

CiNii Research

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>In micro-electro-mechanical systems using piezoelectric bimorph actuators such as FWNAV, small displacements given by the actuators can be magnified using a transmission using the flexible structure. Hence, in these systems, coupling among the direct and inverse piezoelectric effects, and the flexible structure occurs. In this study, a partitioned iterative method is proposed based on the block SUR algorithm for this strongly coupled problem, and the basic performances are demonstrated in numerical examples.</p>

DOI： 10.1299/jsmecmd.2021.34.249

CiNii Research

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Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Bonding and forming of carbon fiber reinforced plastic by induction heating are required for medium-sized aircraft manufacturing. In this paper, electromagnetic and thermal conduction coupled finite element analysis method is described for induction heating of carbon fiber dry cloth. Experiments of induction heating are also performed to discuss the validity of analysis method and experimental method. Comparing the temperature of test pieces between analysis and experimental results, validity of both methods is confirmed for both aluminum sheet and carbon fiber dry cloth.</p>

DOI： 10.1299/jsmecmd.2021.34.130

CiNii Research

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Any shape change of insect’s wings during their flapping motion will be passively caused by external forces such as the inertial and aerodynamic forces because the wings have no interior muscle. The camber deformation, which is the focus of this study, plays an important role in the aerodynamic performance of the insect’s flapping flight. In this study, the effect of passive cambering is investigated using a fluid-structure interaction analysis and a pixel wing model using only structured shell elements, which adequately simulates the camber deformation in actual insects.</p>

DOI： 10.1299/jsmecmd.2021.34.176

CiNii Research

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.23967/coupled.2021.031

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DOI： 10.23967/coupled.2021.012

Scopus

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/NEMS50311.2020.9265594

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.compstruct.2020.112284

Kyutacar

Scopus

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DOI： 10.1016/j.cma.2020.113006

Kyutacar

Scopus

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Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1142/S0219876218501463

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Kyutacar

Scopus

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)

<p>Piezoelectric bimorphs in actuator and sensor applications are usually connected to an external circuit. The mechanical behavior of the piezoelectric bimorph is affected by charge from the circuit, and it behaves as a kind of capacitor in the circuit. Therefore, the interaction between the electrical circuit and piezoelectric bimorph forms the multiphysics inverse piezoelectric – direct piezoelectric – circuit interaction problem. This multiphysics coupling should be taken into account in the design process of the actuators and sensors using the piezoelectric bimorph. Here, the novel finite element analysis method is proposed for this inverse piezoelectric - piezoelectric - circuit coupled problem. The inverse piezoelectric and direct piezoelectric analyses are performed using the finite element method with the shell and solid elements, respectively, in order to consider the thin composite structure. Therefore, the transformation method between the solid and shell variables are used. The description of the circuit is a single degree of freedom. The coupled equations for the direct piezoelectric – circuit interaction are proposed from the continuous conditions for the electric potential and the charge. The coupled algorithm is based on the block Gauss-Seidel method. In the inverse piezoelectric analysis, the homogenization method about the bending rigidity and the mass is used. In the direct piezoelectric analysis, the pseudo-piezoelectric evaluation method for the conductor is used. Finally, it is demonstrated that the proposed method can analyze the coupling phenomena in the RC circuit and the shunt damping application accurately.</p>

DOI： 10.11421/jsces.2020.20200015

CiNii Article

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.15748/jasse.7.181

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007855464

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1142/S0219876218501062

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Miyazaki-shi   2019.11.05  -  2019.11.07

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Miyazaki-shi   2019.11.05  -  2019.11.07

Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.finel.2019.02.001

Kyutacar

Scopus

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

日本   札幌市   2019.06.28  -  2019.06.30

Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1007/s40194-018-00699-5

Scopus

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日本   さいたま市   2019.05.29  -  2019.05.31

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

日本   さいたま市   2019.05.29  -  2019.05.31

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.32604/icces.2019.05888

Kyutacar

Language：Japanese   Publishing type：Research paper (other academic)

<p>A piezoelectric bimorph for actuators and sensors is usually connected to a circuit. The piezoelectric bimorph is affected by charge from the circuit in its mechanical behavior, and it also plays a role of a capacitor in the circuit. Therefore, the coupling of the piezoelectric bimorph and circuit as well as the structure - piezoelectric coupling should be taken into account in the design process of the actuators and sensors using the piezoelectric bimorph. Here, the novel finite element analysis method is proposed for this structure – piezoelectric – circuit coupled problem. Structural and piezoelectric analyses are performed using the finite element method with the shell and solid elements, respectively. Circuit analysis is a single degree of freedom. The coupled equations for the piezoelectric – circuit coupling is proposed from the continuous conditions for the electric potential and charge. The coupled algorithm is based on the block Gauss-Seidel method and a novel transformation method between the solid and shell variables. In the structural analysis, the rule of mixtures about the bending rigidity and the mass is used. In the piezoelectric analysis, the pseudo-piezoelectric evaluation method is used.</p>

DOI： 10.1299/jsmecmd.2019.32.276

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007817403

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.15748/jasse.6.67

Kyutacar

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007611945

Language：Japanese   Publishing type：Research paper (other academic)

<p>Resistance spot welding is widely used in manufacturing industries such as automotive industry. In this paper, we propose electric current analysis and thermal conduction analysis with deformation effect for resistance spot welding analysis. Effect of deformation on bonding strength and triply coupled effect for contact deformation, electric current and thermal conduction are discussed.</p>

DOI： 10.1299/jsmecmd.2019.32.227

CiNii Article

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Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1007/978-3-030-14883-6_7

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

<p>Piezoelectric bimorph for actuators and sensors is usually thin and includes conductor layers such as the electrode and the shim plate. Therefore, this study deals with the coupled piezoelectric and inverse-piezoelectric analysis of thin piezoelectric bimorph with the conductor layers. Solid elements can describe the various types of distributions of electric potential along the thickness, while shell elements are more appropriate to analyze the thin structures. Therefore, instead of using piezoelectric solid elements or piezoelectric shell elements for both the piezoelectric and inverse-piezoelectric analyses, the solid and shell elements are used to simulate the electrical and structural fields, respectively. The coupled algorithm is based on the block Gauss-Seidel method and the transformation method between the solid and shell variables. In the structural analysis, the rule of mixtures for the bending rigidity and the mass is used. A pseudo-piezoelectric evaluation method for the conductor is proposed in order to use the existing programs for the piezoelectric and inverse-piezoelectric analyses without any modification. Finally, it is demonstrated that the proposed method shows very accurate potential distributions in the actuator and sensor modes of the thin piezoelectric bimorph with the conductor layers.</p>

DOI： 10.11421/jsces.2019.20190011

Kyutacar

Scopus

CiNii Article

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.32604/cmes.2019.06781

Kyutacar

Scopus

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Language：Japanese   Publishing type：Research paper (other academic)

<p>Piezoelectric energy harvesting from the mechanical vibrations has attracted considerable research interest in the last decade. This work presents a finite element modeling of forced vibration of flexible piezoelectric devices (FPED). The successful design of the FPED depends on the identification of the optimal geometry, material configurations, and loading conditions to achieve maximum power efficiency at a specific band of excitation frequencies. A piezoelectric energy harvesting (PEH) process from the mechanical vibration takes the form of two-way coupling between piezoelectric and inverse piezoelectric effect, while the piezoelectric energy harvesting from the ocean waves takes the form of three-way coupling between fluid, piezoelectric, and inverse piezoelectric effects. There are some experimental and theoretical studies about piezoelectric energy harvesting from the mechanical vibrations as-well as ocean waves in literature. Meantime, performing design optimization via experimental studies is very expensive. An accurate FE modeling of the coupling effects between the fluid, piezoelectric, and inverse piezoelectric effect will reduce the cost-effective design optimization and increase the energy efficiency of the PEH. In the present study, the FE analysis of FEPD is presented. The result obtained with the FE model is compared with the experimental model reported in the literature.</p>

DOI： 10.1299/jsmecmd.2019.32.279

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007817401

Language：Japanese   Publishing type：Research paper (other academic)

<p>The cambering in the insect's flapping wing plays an important role for the improvement of the aerodynamic performance. In this study, the pixel model is proposed for the cambering in the insect flapping wings. In the proposed model, the role of the vein of membrane is given by the pseudo elastic materials The fundamental performance of the proposed model is demonstrated in the comparison with the previous model using the beam and shell element.</p>

DOI： 10.11345/japannctam.65.0_331

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130008100946

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1103/PhysRevE.98.032411

Kyutacar

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Muroran-shi  

Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Language：Japanese   Publishing type：Research paper (other academic)

<p>Insects have developed their high-performance maneuverability using flapping flight in the process of their evolution. In this study, a partitioned method based on our partition model for their flapping flight, which consists of the subsystems of the wings, the body and the control, is proposed to analyze their maneuverability. Here, the proposed method is applied for a maneuver, which is assumed as the perturbation from the static hovering state. In this case, a specific analysis procedure reduced from the proposed method is the one way coupling from the wing to body subsystems, i.e. the insect flapping wings are analyzed using a finite element method for the fluid-structure interaction, the resulted thrust force acts on the insect's body, and its motion is calculated using the equation of motion of a rigid body. The fundamental performance of the proposed method is demonstrated from the comparison between the present results and the actual observation with respect to the yaw, roll, and pitch as three basic modes of maneuver.</p>

DOI： 10.1299/jsmecmd.2018.31.225

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007653641

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmemecj.2018.J0270401

CiNii Article

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Language：Japanese   Publishing type：Research paper (other academic)

<p>In general, piezoelectric bimorph for actuators and sensors is thin and includes electrodes and shim plates. Therefore, this study deals with the thin composite piezoelectric bimorph. Solid elements can describe the various type of distributions of electric potential over the thickness. However, shell elements are more appropriate for the thin structural analysis. Therefore, instead of using piezoelectric solid elements or piezoelectric shell elements, solid elements and shell elements are used to simulate the electrical field and the structural field, respectively. The coupled algorithm is based on the block Gauss-Seidel method and a novel transformation method between the solid and shell variables. In the structural analysis, the rule of mixtures about the bending rigidity and the mass is used. In the electrical analysis, the single piezoelectric solver is used to obtain the potential distribution in the composite piezoelectric bimorph using a pseudo-piezoelectric treatment for the conductor. Finally, this study illustrates the very accurate potential distributions in the actuator and sensor modes of the thin composite piezoelectric bimorph.</p>

DOI： 10.1299/jsmecmd.2018.31.236

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007653661

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this study, a shape simplification modeling of insect flapping wings is proposed in order to reveal the mechanical roles of the veins in their cambering, since it seems to be unclear how the elastic deformation of insect wings caused by the aerodynamic force results in their camber. In the proposed modeling, the veins are divided into the areas according to their functions, and the macroscopic constitutive relationship in each area is described using the corresponding beam. Furthermore, the wing membrane supported by the veins is described using a rectangular shell. The aerodynamic pressure dominant in the cambering is considered in the static deformation of the model wing. The finite element analysis taking into account the geometric nonlinearity is applied to the proposed model with the setup consistent with the actual insect. As the result, the mechanical roles of the veins in the cambering of insect flapping wings are revealed.

DOI： 10.11421/jsces.2018.20180018

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<p>Electrical contact resistance plays important role in melting and bonding of steel sheets interface for resistance spot welding. Although many researchers have proposed theoretical models of electrical contact resistance, microscale structural and electrical coupled finite element analysis is required to evaluate electrical contact resistance because its characteristics depend on the real contact surface, elasto-plastic large deformation contact behavior, electric current and temperature. In this study, we discuss a microscale structural and electrical coupled finite element analysis for the electrical contact resistance. In this analysis, the structural analysis with elasto-plastic, large deformation and contact effect is performed using measured surface based finite element analysis model and temperature dependent material properties. Deformed shape obtained by the structural analysis is used for the electrical analysis considering temperature dependent electrical resistivity. The electrical contact resistance analyses are performed to discuss the SS–RVE (Statistically Similar Representative Volume Element) size and computational cost, and to confirm the validity of the proposed analysis method. The dependency of the electrical contact resistance on the contact pressure and the temperature are compared with those of Babu's model and experimental results from the viewpoint of these path dependencies.</p>

DOI： 10.1299/jsmecmd.2018.31.257

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007653677

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmebio.2018.30.1I12

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007410874

Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1049/mnl.2017.0428

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/NEMS.2017.8017145

Kyutacar

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (other academic)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Korea   Busan   2017.05.25  -  2017.05.26

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

倉敷   2017.05.18  -  2017.05.19

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1088/1748-3190/12/1/016008

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

愛知   2017.01.19  -  2017.01.20

Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.compstruc.2016.09.003

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Resistance spot welding of three steel sheets is used in automotive manufacturing. The determination of welding conditions for three steel sheets welding is more difficult than that for two steel sheets welding because in the former case, two interfaces are simultaneously welded. The welding condition to improve the weld strength of thin and thick sheets' interface is required for thin, thick, and thick sheets welding. In addition, avoiding weld spatter is an important technical concern for the three sheets welding.<br> This paper discusses the triply coupled effects of elasto-plastic large deformation contact, electric current, and thermal conduction for the three sheets welding via triply coupled finite element analyses. The triply coupled effects of thin and thick sheets' interface and those of thick and thick sheets' interface are compared to discuss the special characteristics of the triply coupled effects of three sheets welding.<br> The nugget diameter of the thick and thick sheets' interface is larger than that of the thin and thick sheets' interface because the electrical contact resistance and the base electrical resistance of high-strength steels are higher than those of general-strength steels. Furthermore, the chain of the coupled effects of electrical resistances, Joule heat generation, temperatures, and electrical resistances is strong. As the effect of welding current on temperature by the coupling effect for the thick and thick sheets' interface is stronger than that for the thin and thick sheets' interface, the possibility of spatter increases. Increasing the nugget diameter solely for the thin and thick sheets' interface using electrode force is difficult because the effect of the electrode force on the nugget diameter is approximately the same for both interfaces. On the contrary, material characteristics can affect the nugget diameter solely for either of the interfaces. The possibility of spatter increases for the welding condition with a sheet gap because the temperature of the contact edge for the sheets' interface increases.

DOI： 10.2207/qjjws.35.63

Scopus

CiNii Article

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Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

<p>In this study, a FSI design approach of an insect–inspired MEMS wing is proposed. Similar to actual insects, the proposed design actively uses the FSI to create the passive wing motion. Each design solution has a so-called 2.5–D structure for the MEMS technology. The 3–D unsteady monolithic FSI equation system is solved to find the satisfactory design solutions using a projection method. An area of satisfactory design solutions in a design parameter space is found. Each design solution in this area can generate the thrust sufficient to support the weight of the model insect.</p>

DOI： 10.11345/japannctam.64.0_OS8-02-01

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007510260

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2017.30.284

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130006551242

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2017.30.295

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130006551250

Language：Japanese   Publishing type：Research paper (other academic)

<p>Resistance spot welding is widely used in manufacturing industry. Analysis of resistance spot welding is required for examination of welding mechanism and determination of welding parameters such as weld current, electrode force and weld time because welding parameters are obtained empirically. In this paper, effect of structure–electric current–thermal conduction triply coupled model on resistance spot welding analysis results are examined to make analysis more efficient. Statistically similar representative volume element size and resolution of finite element analysis model are also discussed for microscale electrical contact resistance analysis of multiscale resistance spot welding analysis.</p>

DOI： 10.11345/japannctam.64.0_OS8-02-04

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007510177

Language：English   Publishing type：Research paper (other academic)

DOI： 10.11345/japannctam.64.0_OS8-02-02

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007510311

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2017.30.275

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130006551222

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

Kyutacar

Scopus

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Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmebio.2017.29.2F23

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007123468

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Scopus

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Language：English   Publishing type：Research paper (international conference proceedings)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Korea   Seoul   2016.07.24  -  2016.07.29

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Korea   Seoul   2016.07.24  -  2016.07.29

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2016.29.4_154

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007094354

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2016.29.4_305

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007093965

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2016.29.4_271

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130007093825

Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.14920/jwstaikai.2016f.0_12

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130005435757

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

2015.10.28  -  2015.10.30

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Tokyo   2015.10.26  -  2015.10.26

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Hokkaido   2015.09.16  -  2015.09.19

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

Kyutacar

Scopus

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Language：English   Publishing type：Research paper (scientific journal)

Interactions between elasto-plastic contact deformation, electric current and heat conduction produces complicated triply coupled effect in the resistant spot welding. Since the coupled effect affects weld strength, the coupled finite element analysis is required to determine welding parameters such as welding current, electrode force, welding time and electrode shape.<br>This paper discusses in detail the elasto-plastic contact, electric current and thermal conduction triply coupled analysis method. The coupled analysis method uses modified electrical contact resistance model, modified thermal contact resistance model and iterative partitioned coupled algorithm suitable for strong coupled problem. The validity of the method are discussed under the different condition such as welding current, electrode force, welding time, material and number of the steel sheets. The analysis result of nugget growth curve agrees very well with experimental result for two sheet welding. The validity is confirmed by not only nugget growth curve but also surface temperature of steel sheet and electrode for three sheet welding with high tension steel. The solution convergence is discussed for the iterative partitioned coupled algorithm and the conventional coupled algorithm. Since the coupled effect is strong for between electric current and thermal conduction, the choice of the coupled algorithm is important for the resistance spot welding analysis. Effect of elasto-plastic contact deformation, change of electric current distribution and thermal conduction on resistance spot welding are discussed from the viewpoint of coupled effect. The coupled model with ability to simulate the chain of coupled effect is required to improve the analysis reliability. The importance of temperature dependency of material property, electrical contact resistance, thermal contact resistance and latent heat effect are also discussed.

DOI： 10.2207/qjjws.33.271

Scopus

CiNii Article

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

Kyutacar

Scopus

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Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1299/jsmeapbio.2015.8.66

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110010043721

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

In recent years, Micro Air Vehicles (MAVs) mimicking insects have been developed for the purpose of observation in narrow and disaster areas. Micro Electro Mechanical Systems (MEMS) are typically manufactured using the semiconductor manufacturing technology, and have attracted much attention in various fields. In this study, in order to realize an insect-like MAV, its prototype millimeter wing is developed. The prototype wing is designed based on the mechanics of insect flapping wings and the data of an actual insect. The prototype wing made of a single crystal silicon and a polyimide membrane is fabricated, and its fundamental characteristics are evaluated.

DOI： 10.1299/jsmemnm.2015.7._30pm1-E-5

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110010046076

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2015.28._258-1_

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110010044383

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1088/1748-3182/9/4/046009

Scopus

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)

This study is concerned with aerodynamic effects in passive pitching dynamics of insect flapping wings, which would be based on the Fluid-Structure Interaction (FSI). Thus, we evaluated them using three-dimensional numerical analyses for the FSI based on the finite element method. In the numerical analyses, the FSI in insect flapping wing is broken down into its constituent components in order to find the aerodynamic effects in the passive pitching dynamics as follows: (a) The dipteran passive pitching dynamics is based on the interaction between the wing's elastic and aerodynamic forces, while it is enhanced by the wing's inertial effect. (b) The air damping leads the mode of wing's natural vibration from underdamping to overdamping so as to form the characteristic pitching motion, where the damped natural vibration of the wing appears so as to enhance the wing rotation.

DOI： 10.1299/transjsme.2014cm0106

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130003399154

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

A reliable analysis method is required for strongly coupled problem of fluid and structure. In the dynamically scaled experiment, it is difficult to satisfy the key conditions of non-dimensional numbers simultaneously as the number of conditions increases. In the computation, although it has been developing rapidly, its careful validation is still required. In this study, a fluid-structure interaction simulation using the complementary computation and dynamically scaled experiment is proposed, and it is applied for an insect flapping flight to demonstrate its ability.

DOI： 10.11345/japannctam.63.0_83

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/130005478028

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

DOI： 10.1299/jsmecmd.2014.27.403

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009940260

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

Kyutacar

Scopus

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (other academic)

This study is concerned with air damping effect in passive pitching motion of insect flapping wing, which will be based on the Fluid-Structure Interaction (FSI). Thus, we evaluated it using three-dimensional numerical analyses for the FSI based on the finite element method. From the numerical analysis, we found that the air damping leads the mode of wing's natural vibration from underdamping to overdamping so as to form the characteristic pitching motion.

DOI： 10.1299/jsmemecj.2014._J0220401-

CiNii Article

Other Link： https://ci.nii.ac.jp/naid/110009943479

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this study, performances of a projection method for the interaction system of an incompressible fluid and a flexible elastic structure are evaluated. The proposed projection method splits the monolithic equation system into the equilibrium equations and the pressure Poisson equation (PPE) using the intermediate velocity in the nonlinear iterative procedure. The monolithic equation system has the drawbacks of the large degrees of freedoms and the ill-condition. The proposed formulation reduces these drawbacks. The performance of the proposed projection method is demonstrated using a channel with a flexible flap, which is one of typical test problems, and a flapping flexible wing in a closed tank with comparable fluid and structural mass densities. It follows from the results for these numerical examples that the proposed projection method is efficient for the cases, where some conventional monolithic and partitioned methods would suffer the numerical difficulties.

DOI： 10.11421/jsces.2013.20130017

Scopus

CiNii Article

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

スペイン   イビザ   2013.06.16  -  2013.06.19

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this study a finite element analysis using hierarchal decompositions for the interaction of structural, fluidic and electrostatic fields is applied for vibration analyses of a MEMS structural component. The interaction is partitioned into the electrostatic field and the fluid-structure interaction (FSI) using the block Gauss-Seidel method. The FSI is split into the pressure field and the other using a projection method, where the intermediate state variables are used for the splitting without generating computationally expensive Schur complement matrices. The developed finite element analysis is applied for a micro cantilever beam actuated by the step electrostatic force in vacuum and air. It was demonstrated from the comparisons among the numerical and experimental results that the proposed analyses provide the results consistent with the experimental results. It follows from the present results that the numerical analyses taking into account the interaction of the structural, fluidic and electrostatic fields are required for the accurate predictions of the vibration characteristics of the MEMS structural components.

DOI： 10.1299/kikaia.79.1291

Scopus

CiNii Article

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this study a consistent projection method for the fluid-structure interaction (FSI) was proposed. The intermediate state variables were used to split the monolithic equation system into the equilibrium equations and the pressure Poisson equation (PPE). The incompressibility constraint is asymptotically satisfied by solving the proposed PPE in the iterative solution procedure under the asymptotic agreement of the intermediate velocity with the velocity. Therefore the proposed method is consistent with the monolithic method. The performance of the present method was demonstrated using a channel, which is one of typical test problems, and a flexible wing flapping in the closed fluid domain with the comparable fluid and structural densities.

DOI： 10.1299/kikaia.79.1161

Scopus

CiNii Article

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Japan   Kanazawa   2012.09.09  -  2012.09.12

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)

DOI： 10.1299/kikaib.78.300

Scopus

CiNii Article

Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (other academic)

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

Australia   Sydney   2010.07.19  -  2010.07.23

Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)

2010.05.28  -  2010.05.28

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this study, we evaluated the lift force generated by the crane-fly's flapping wing with the passive pitching using the dynamically scaled model. Since the wing and the surrounding fluid interact with each other, the dynamic similarity between the model and actual crane-fly flights was measured using not only the Reynolds and Strouhal numbers but also the mass and Cauchy numbers. Although there existed the difference between the mass number due to the constant acceleration of the gravity, but the lift coefficient simulated by our model indicated that the flapping wing with the passive pitching produces the enough lift force to support the crane-fly's weight.

DOI： 10.1299/kikaib.76.764_601

Scopus

CiNii Article

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Yokohama   2010.03.29  -  2010.03.31

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1242/jeb.030684

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1242/jeb.020404

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this paper, an incremental formulation of pressure based method for fluid-rigid body interaction using intermediate variable is presented. The present method is based on the method proposed by Matsumoto and Kawahara in previous studies. In their method, the pressure Poisson equation equivalent to the incompressibility constraint is derived by using the intermediate fluid velocity and the approximation of enough small error between the intermediate fluid velocity and the fluid velocity. In the present method, all terms appear in the coupled equation system are evaluated in the same time instant, and unknown variables are solved incrementally by iterative solution procedure in each time step so as to satisfy the coupled equation system defined in the time instant. The present formulation is required when structural nonlinearity such as large deformation should be considered. The present method is applied for the free vibration of a rigid circular cylinder in a quiescent fluid to verify its performance.

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In this paper, a strongly coupled method for interaction of rigid body, incompressible viscous fluid and electrostatic field is developed. The present method is composed of monolithic and partitioned methods. The former solves structure-fluid interaction and the later solves interaction of electrostatic field and the other fields. The difference between the present method and conventional method is the introduction of the iterative solution procedure in the partitioned method. To demonstrate the fundamental performances of the present method, it is applied to simulate a micro membrane actuated by electrostatic force situated in air. The present result agrees well with the theoretical solution when the displacement of the rigid body is small. We also comfirm that the iterative solution procedure makes the present method to be the strongly coupled method through the numerical example.

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Language：English   Publishing type：Research paper (scientific journal)

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

In this paper, a parallel monolithic method for shell-fluid interaction based on the consistent Pressure Poisson Equation (PFE) is developed and its parallel computational efficiency is demonstrated. The previous and present studies show that iterative solvers without preconditioning work well to solve the PPE, even though the coefficient matrix of the original linearized coupled equations becomes to be ill-conditioned. As a consequence, combining with the iterative solvers without preconditioning parallelized based on the mesh decomposition, the developed method can archive efficient parallel computation. To demonstrate the performances of the developed method, it is applied to simulate the vibration of an elastic plate situated in the wake of a rectangular cylinder and a flapping elastic wing in fluid.

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This paper describes an efficient monolithic method for shell-fluid interaction problems based on the fluid pressure Poisson equation (PPE). The PPE is derived so as to be consistent with the coupled equation system for the shell-fluid interaction. In the proposed method, the fluid pressure is derived implicitly so as to satisfy the incompressibility. constraint and all the other unknown variables except those for the shell are derived explicitly. The coefficient matrix of the PPE is well-conditioned even if the structure is very stiff or heavy compared to the fluid, and even if the ill-conditioned submatrix is generated due to the shell elements. These characteristics are successfully utilized to combine the proposed method with the standard conjugate gradient method. To demonstrate fundamental perfermances of the proposed method, it is applied to evaluate the vibration characteristics of a thin elastic cantilever plate in a quiescent fluid.

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In this paper, a novel insect flight model based on fluid-structure interaction is proposed. Incorporating the high compliance of the wing base, which is observed in Diptera, the proposed model can express the automatic control of the wing rotation via fluid-structure interaction and can generate the adequate aerodynamic forces for the insect flight. The fluid-structure interaction is simulated by a monolithic method based on the finite element method. The result given by the proposed model is investigated by comparison with experimental results of the dynamically scaled model of the fruit fly given by Dickinson et al.

Scopus

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1002/nme.1348

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

This paper describes a new monolithic approach based on the Pressure Poisson Equation (PPE) to solve interaction problems of incompressible viscous fluid and an elastic body. The PPE is derived so as to be consistent with the coupled equation system for the fluid-structure interaction (FSI). Based on this approach, we develop two efficient monolithic methods. In both methods, the fluid pressure is derived implicitly so as to satisfy the incompressibility constraint and all the other unknown variables are derived fully explicitly or partially explicitly. The coefficient matrix of the PPE for the FSI has characteristics of (a) symmetric and positive definite feature, (b) reduction of degrees of freedoms to be solved, and (c) less dependence of the condition on material properties. The arbitrary Lagrangian Eulerian method is employed for the fluid to take into account the deformable fluid structure interface. To demonstrate fundamental performances of the proposed approach, the developed two monolithic methods are applied to simulate the vibration of a rectangular cylinder induced by vortex shedding.

DOI： 10.1299/kikaib.71.1565

Scopus

CiNii Article

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Language：English   Publishing type：Research paper (other academic)

ギリシャ   Santorini   2005.05  -  2005.05

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

This paper describes a strong coupling method considering non-conforming mesh on fluid-structure interface. In the present method, a transformation matrix derived from the geometrical relations between non-conforming fluid and structural meshes on fluid-structure interface is directly combined with the formulation of the strong coupling method to satisfy the compatibility and equilibirium conditions on fluid-structure interface. The conjugate gradient method is applied to solve the derived coupled equation system by introducing the consistent pressure Poisson equation. To verify basic characteristics of the proposed method, it is applied for free vibration of a cylinder in quiescent fluid. The added mass and damping coefficients derived by the present method agree well with those by other researchers.

DOI： 10.1299/kikaib.71.1346

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CiNii Article

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

This paper describes an efficient strong coupling method for fluid-structure interaction based on the explicit method for structure and the semi-implicit method for fluid. The solution process of fluid-structure interation system is divided into that of fluid and structure, which is independent to each other except data transfer of the fluid-structure interface. Some existing codes with small modification can be utilized to realize the above two solution processes. Note that the time increment is restricted by the Courant's and diffusive number conditions. The method is applied to solve a loaded cantilever in a flow channel under some conditions. Through the numerical results, characteristics of the method are compared to those of a strong coupling and a weak coupling method

DOI： 10.1299/kikaib.70.3098

Scopus

CiNii Article

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Language：Japanese   Publishing type：Research paper (scientific journal)

Language：Japanese   Publishing type：Research paper (scientific journal)

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

DOI： 10.1016/B978-008044046-0.50336-5

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

DOI： 10.1016/S0045-7949(02)00293-6

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

This paper describes a multi-step strong coupling method to analyze an equation system of incompressible viscous fluid and an elastic body. The procedure is derived based on the following techniques; (a) sub-structuring, (b) velocity-pressure splitting, and (c) time integration of Newmark's family. Only simultaneous equations with well-defined symmetric matrices are solved in the method. To demonstrate fundamental performance of the method, it is applied to solve an impacted beam in fluid. The result shows good agreement with a previous work.

DOI： 10.1299/kikaib.68.2451

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Language：English   Publishing type：Research paper (international conference proceedings)

Austria   Vienna   2002.07.07  -  2002.07.12

Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)

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Language：Others   Publishing type：Research paper (scientific journal)

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)

This paper proposes an automated search method for multidimensional design window (DW), which is defined as an area of satisfactory design solutions in a design parameter space, using both continuous evolutionary algorithms (CEA) and improved K-means clustering. This method consists of two phases: (a) CEA-based search for satisfactory design solutions in an ill-structured design space, and (b) clustering-based identification of DWs from the solutions. To demonstrate practical performance of the method, it is applied to an automated structural design of micro electrostatic actuator for optical memory. © 2001, The Japan Society of Mechanical Engineers. All rights reserved.

DOI： 10.1299/kikaic.67.460

Scopus

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Language：English   Publishing type：Research paper (international conference proceedings)

Tokyo   2000.04  -  2000.04

Event date： 2023.12.16 - 2023.12.17   Language：Japanese   Country：Japan  

Event date： 2023.11.06 - 2023.11.09   Language：Japanese   Country：Japan  

Event date： 2023.10.25 - 2023.10.27   Language：Japanese   Country：Japan  

Event date： 2023.08.29 - 2023.08.31   Language：English   Country：Japan  

Event date： 2023.05.31 - 2023.06.02   Language：Japanese   Country：Japan  

Event date： 2023.04.25 - 2023.04.28   Language：English   Country：France  

Technical Programme consists of 3 Plenary Lectures, 12 Semi-Plenary Lectures, 62 keynote Lectures, 53 Minisymposia, 562 oral presentations, 4 tech talks, namely, 643 presentations overall.

Event date： 2023.01.15 - 2023.01.19   Language：English   Country：Germany  

Event date： 2022.11.16 - 2022.11.18   Language：Japanese   Country：Japan  

Event date： 2022.11.16 - 2022.11.18   Language：Japanese   Country：Japan  

Event date： 2022.11.16 - 2022.11.18   Language：Japanese   Country：Japan  

Event date： 2022.11.14 - 2022.11.16   Language：Japanese   Country：Japan  

Event date： 2022.11.14 - 2022.11.16   Language：Japanese   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.08.31 - 2022.09.02   Language：English   Country：Japan  

Event date： 2022.07.31 - 2022.08.05   Language：English   Country：Japan  

Number of minisymposia: 287, Number of abstracts: 2,069 (Asian Pacific: 1,086, Americas: 370, Europe - Middle East - Africa: 613), Number of participants: 2,346 (Asian Pacific: 1,258, Americas: 408, Europe - Middle East - Africa: 680)

Event date： 2022.07.31 - 2022.08.05   Language：English   Country：Japan  

Number of minisymposia: 287, Number of abstracts: 2,069 (Asian Pacific: 1,086, Americas: 370, Europe - Middle East - Africa: 613), Number of participants: 2,346 (Asian Pacific: 1,258, Americas: 408, Europe - Middle East - Africa: 680)

Event date： 2022.06.01 - 2022.06.03   Language：Japanese   Country：Japan  

Event date： 2021.09.21 - 2021.09.23   Language：Japanese  

Event date： 2021.09.21 - 2021.09.23   Language：Japanese  

Event date： 2021.09.21 - 2021.09.23   Language：Japanese  

Event date： 2021.09.21 - 2021.09.23   Language：Japanese   Country：Japan  

Event date： 2021.09.01 - 2021.09.03   Language：English  

Event date： 2021.09.01 - 2021.09.03   Language：English  

Event date： 2021.09.01 - 2021.09.03   Language：English  

Event date： 2021.09.01 - 2021.09.03   Language：English  

Event date： 2021.09.01 - 2021.09.03   Language：English  

Event date： 2021.05.26 - 2021.05.28   Language：English  

Event date： 2021.05.26 - 2021.05.28   Language：English  

Event date： 2021.05.26 - 2021.05.28   Language：English  

Event date： 2021.05.26 - 2021.05.28   Language：English  

Event date： 2021.04.25 - 2021.04.29   Language：English  

Event date： 2021.01.11 - 2021.01.15   Language：English  

Event date： 2020.09.27 - 2020.09.30   Language：English  

Event date： 2019.11.05 - 2019.11.07   Language：English  

Event date： 2019.11.05 - 2019.11.07   Language：English  

Event date： 2019.09.16 - 2019.09.18   Language：Japanese  

Event date： 2019.09.16 - 2019.09.18   Language：Japanese  

Event date： 2019.09.16 - 2019.09.18   Language：English  

Event date： 2019.06.28 - 2019.06.30   Language：Japanese  

Event date： 2019.06.03 - 2019.06.05   Language：English  

Event date： 2019.06.03 - 2019.06.05   Language：English  

Event date： 2019.05.29 - 2019.05.31   Language：Japanese  

Event date： 2019.05.29 - 2019.05.31   Language：Japanese  

Event date： 2019.03.25 - 2019.03.28   Language：English  

Event date： 2018.11.23 - 2018.11.25   Language：Japanese  

Event date： 2018.11.23 - 2018.11.25   Language：Japanese  

Event date： 2018.09.18 - 2018.09.20   Language：English  

Event date： 2018.09.18 - 2018.09.20   Language：English  

Event date： 2018.09.09 - 2018.09.12   Language：Japanese  

Event date： 2018.06.11 - 2018.06.15   Language：English  

Event date： 2018.06.06 - 2018.06.08   Language：English  

Event date： 2018.05.23 - 2018.05.25   Language：Japanese  

Event date： 2017.09.16 - 2017.09.18   Language：Japanese  

Event date： 2017.09.16 - 2017.09.18   Language：Japanese  

Event date： 2017.09.16 - 2017.09.18   Language：Japanese  

Event date： 2017.08.22 - 2017.08.24   Language：Japanese  

Event date： 2017.08.22 - 2017.08.24   Language：Japanese  

Event date： 2017.08.22 - 2017.08.24   Language：English  

Event date： 2017.05.18 - 2017.05.19   Language：Japanese  

Event date： 2017.01.19 - 2017.01.20   Language：Japanese  

Event date： 2016.09.22 - 2016.09.24   Language：Japanese  

Event date： 2016.09.22 - 2016.09.24   Language：Japanese  

Event date： 2016.09.22 - 2016.09.24   Language：Japanese  

Event date： 2015.10.28 - 2015.10.30   Language：Japanese  

Event date： 2015.10.10 - 2015.10.12   Language：Japanese  

Event date： 2014.11.22 - 2014.11.24   Language：Japanese  

Event date： 2014.09.26 - 2014.09.28   Language：Japanese  

Event date： 2014.09.07 - 2014.09.10   Language：Japanese  

Event date： 2014.08.28 - 2014.08.30   Language：Japanese  

Event date： 2014.06.11 - 2014.06.13   Language：Japanese  

Event date： 2014.05.21 - 2014.05.23   Language：Japanese  

Event date： 2013.11.02 - 2013.11.04   Language：Japanese  

Event date： 2013.11.02 - 2013.11.04   Language：Japanese  

Event date： 2013.09.08 - 2013.09.11   Language：Japanese  

Event date： 2010.11.01   Language：Japanese  

Event date： 2010.09.05 - 2010.09.08   Language：Japanese  

Event date： 2010.08.17 - 2010.08.19   Language：Japanese  

Event date： 2010.05.26 - 2010.05.28   Language：Japanese  

Event date： 2010.05.26 - 2010.05.28   Language：Japanese  

Event date： 2009.09.13 - 2009.09.16   Language：Japanese  

Event date： 2009.04   Language：Japanese  

Event date： 2009.04   Language：Japanese  

Event date： 2009.03.18   Language：Japanese  

Event date： 2009.03.18   Language：Japanese  

Event date： 2009.03.18   Language：Japanese  

Event date： 2009.03.09   Language：Japanese  

Event date： 2009.03.09   Language：Japanese  

Event date： 2009.03.09   Language：Japanese  

Event date： 2008.11.01 - 2008.11.03   Language：Japanese  

Event date： 2008.11.01 - 2008.11.03   Language：Japanese  

Event date： 2007.11.26 - 2007.11.28   Language：Japanese  

Event date： 2007.09.09 - 2007.09.12   Language：Japanese  

Event date： 2006.11.03 - 2006.11.05   Language：Japanese  

Event date： 2006.11.03 - 2006.11.05   Language：Japanese  

Event date： 2006.08.22 - 2006.08.23   Language：Japanese  

Event date： 2006.07.16 - 2006.07.22   Language：English  

Event date： 2006.06.12 - 2006.06.14   Language：Japanese  

Event date： 2006.06.12 - 2006.06.14   Language：Japanese  

Event date： 2006.05.26   Language：Japanese  

Event date： 2005.05.12   Language：Japanese  

Event date： 2005.05   Language：Japanese  

Event date： 2005.05   Language：Japanese  

Event date： 2005.04   Language：Japanese  

Event date： 2005.04   Language：Japanese  

Event date： 2005.04   Language：Japanese  

Event date： 2005.04   Language：Japanese  

Event date： 2005.03.11   Language：Japanese  

Event date： 2004.11   Language：Japanese  

Event date： 2004.11   Language：Japanese  

Event date： 2004.11   Language：Japanese  

Event date： 2004.05   Language：Japanese  

Event date： 2003.07   Language：English  

Event date： 2003.05   Language：Japanese  

Event date： 2002.09   Language：Japanese  

Event date： 2002.09   Language：Japanese  

Event date： 2002.05   Language：Japanese  

Event date： 2002.01   Language：Japanese  

Event date： 2001.11   Language：Japanese  

Event date： 2000.08   Language：Japanese  

Event date： 2000.04   Language：Japanese  

Event date： 1999.11   Language：Japanese  

Event date： 1999.11   Language：Japanese  

Event date： 1999.07   Language：Japanese  

Event date： 1999.06   Language：Japanese  

Event date： 1999.01   Language：Japanese  

Event date： 2013.03.06 - 2013.03.08   Language：Japanese   Presentation type：Keynote lecture   Venue：東京  

Presentation type：Keynote lecture   Venue：東京工業大学大岡山キャンパス  

Presentation type：Invited lecture   Venue：金沢大学  

Presentation type：Invited lecture   Venue：大阪  

Presentation type：Invited lecture  

Presentation type：Invited lecture  

Presentation type：Invited lecture   Venue：福岡  

Presentation type：Invited lecture   Venue：福岡  

Presentation type：Invited lecture   Venue：東京  

Presentation type：Invited lecture   Venue：福岡  

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：Japan

Country：United States