研究者詳細 - 瀨部　昇

論文 - 瀨部　昇

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Strong feasibility of the dual problem of linear matrix inequality for H-infinity output feedback control problem 査読有り国際誌

Waki H., Sebe N.

SICE ISCS 2018 - 2018 SICE International Symposium on Control Systems 47 - 53 2018年03月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Japan Tokyo 2018年03月09日 - 2018年03月11日

© 2018 The Society of Instrument and Control Engineers - SICE. Strong feasibility (a.k.a. strict feasibility) of the dual problem of a given linear matrix inequality (LMI) is an important property to guarantee the existence of an optimal solution of the LMI problem. In particular, the LMI problem may not have any optimal solutions if the dual is not strongly feasible. This implies that the computed solutions by SDP solvers may be meaningless and useless for designing the controllers of H∞ output feedback control problems. The facial reduction is a tool to analyze and reduce such non-strongly feasible problems. We introduce the strong feasibility of the dual and facial reduction and provide the necessary and sufficient condition on the strong feasibility. Furthermore, we reveal that the condition is closely related to invariant zeros in the plant.

DOI： 10.23919/SICEISCS.2018.8330155

Scopus

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外部非負システムへの変換による離散時間線形時不変システムのH2解析査読有り

蛯原義雄, 瀬部昇, 増淵泉, 脇隼人, 管野政明, 椿野大輔

システム制御情報学会論文誌 ( 一般社団法人システム制御情報学会 ) 31 ( 2 ) 75 - 84 2018年02月

記述言語：日本語掲載種別：研究論文（学術雑誌）

In this paper, we explore H2 analysis techniques of general, not necessarily positive, discrete-time linear time-invariant (LTI) systems by means of positive system theory. While externally positive systems are a particular class of systems whose impulse responses take only nonnegative values, we often encounter such impulse responses even in the analysis of general LTI systems. A typical example is the computation of the H2 norm where we focus on squared impulse responses. In view of this observation, we first clarify that we can construct an SISO externally positive system whose impulse response is given by the square of the impulse response of a given SISO LTI system. This system conversion allows us to reduce the H2 norm computation problem of a general LTI system to the l∞-induced norm computation problem (or l1 problem in short) of the resulting externally positive system. It also turns out that this problem reduction enables us to derive various alternative formulas for the H2 norm of general discrete-time LTI systems.

DOI： 10.5687/iscie.31.75

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130006734448

A bias fault estimation of actuators and sensors by optimization with l0 norm constraint 査読有り国際誌

Ichikawa M., Sebe N., Suyama K., Indriawati K.

2017 Asian Control Conference, ASCC 2017 1443 - 1448 2017年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Australia Gold Coast 2017年12月17日 - 2017年12月20日

© 2017 IEEE. This paper proposes a bias fault estimation method by a single observer, which is based on the compress sensing. Fault-tolerant control of systems becomes increasingly important to keep safety of systems. The bias fault estimation is one of the most important technologies in fault-tolerant control theory, especially for passive fault-tolerant servo systems. For the bias fault estimation problem, the disturbance observer approach has been proposed. However, this approach cannot be applied to the estimation of all faults at both actuators and sensors by a single observer. In this paper, a bias fault estimation method based on the compress sensing is proposed. Under the assumption that only one device fault occurs at a time, the bias fault estimation method by a single observer can be formulated as an optimization problem with l0 norm constraint. This paper gives a numerical example to demonstrate the effectiveness of the proposed estimation method.

DOI： 10.1109/ASCC.2017.8287385

Scopus

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Effectiveness of higher order controllers for uncertain systems 査読有り国際誌

T. Tada, Y. Izumiguchi, N. Sebe

2017 Asian Control Conference, ASCC 2017 582 - 587 2017年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Australia Gold Coast 2017年12月17日 - 2017年12月20日

© 2017 IEEE. This paper demonstrates the effectiveness of higher order controllers for uncertain systems. Gain scheduling control is a powerful control strategy for robust control, if the uncertainty is measurable. If the uncertainty is not measurable, uncertainty might be estimated by using filters. Using such estimation filters gain scheduling controllers can be regarded as higher order controllers. Accordingly, higher order controllers might achieve better performance for uncertain systems. This paper considers a design problem of robust dynamical state feedback, as an example of higher order controller. This paper also demonstrates the effectiveness of it.

DOI： 10.1109/ASCC.2017.8287235

Scopus

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Reduction of H-infinity state feedback control problems for the servo systems 査読有り国際誌

H. Waki, N. Sebe

2017 Asian Control Conference, ASCC 2017 2244 - 2249 2017年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Australia Gold Coast 2017年12月17日 - 2017年12月20日

© 2017 IEEE. We study the strict feasibility of the linear matrix inequality (LMI) and its dual for H∞ state feedback control problem for the multi-input multi-output (MIMO) servo system. Then we show that weighting functions with unstable zeros improve the numerical accuracy. We discuss the relationship between the zeros in the weighting function and the strict feasibility of the dual LMI. This is closely related to the numerical accuracy of LMI solvers because algorithms implemented in LMI solvers require the strict feasibility for both the LMI and its dual. Furthermore, we provide closed-form expression of the performance limitation when given plants have one or two unstable invariant zeros. The non-strict feasibility of the dual plays an essential role in the expression.

DOI： 10.1109/ASCC.2017.8287524

Scopus

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Controller Reset Strategy for Anti-Windup Based on Switching L2 Gain Analysis 査読有り

Koichi Suyama,Noboru Sebe

Asian Journal of Control 19 ( 6 ) 1877 - 1890 2017年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd When the calculated value of a control input approaches its limitations, resets of controllers are often used to prevent windup. However, an automatic reset should only be performed after confirmation that it will not adversely affect the transient performance and lead to another windup. In this study, we apply a switching L 2 gain analysis to a more appropriate evaluation of transient responses after a reset in order to propose an improved strategy for the automatic resets of controllers, such that windup does not accompany resets.

DOI： 10.1002/asjc.1530

Scopus

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Support technology for safe preventive maintenance of control systems 査読有り国際誌

Koichi Suyama,Noboru Sebe

20th IFAC World Congress (IFAC-PapersOnLine) 50 ( 1 ) 10369 - 10376 (IFAC-PaperOnLine) 2017年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

France Toulouse 2017年07月09日 - 2017年07月14日

© 2017 On the basis of fault-tolerant control theory and switching L 2 gain analysis, we propose a new maintenance support technology to implement an operating state suitable for safely performing preventive maintenance of each subsystem, where the safety of the bidirectional transitions between normal operation and an operating state is guaranteed.

DOI： 10.1016/j.ifacol.2017.08.1690

Scopus

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Simultaneous estimation of optical flow and its boundaries based on the dynamical system model 査読有り国際誌

Michishita Y., Sebe N., Enokida S., Nobuyama E.

VISIGRAPP 2017 - Proceedings of the 12th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications 6 377 - 385 2017年02月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Portugal Porto 2017年02月27日 - 2017年03月01日

© 2017 by SCITEPRESS - Science and Technology Publications, Lda. Optical flow is a velocity vector which represents the motion of objects in video images. Optical flow estimation is difficult in the neighborhood of flow boundary. To resolve this problem, Sasagawa (2014) proposes a modified dynamical system model in which one assumes that, in the neighborhood of flow boundaries, the brightness flows in the perpendicular direction, and considers the resulting corrections to the brightness constancy constraint. However, in that model, the correction is occurred even in place where the flow is continuous. We propose a new model, which switches the conventional model and the proposed model in Sasagawa (2014). As a result, we expect improvement of the estimate accuracy in place where the flow is continuous. We conduct numerical experiments to investigate the improvements that the proposed model yields in the estimation accuracy of optical flows.

DOI： DOI: 10.5220/0006101303770385

Scopus

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Switching L2 Gain for Analyzing the Magnitude of a System Switch 査読有り

Koichi Suyama,Noboru Sebe

55th IEEE Conference on Decision and Control 6395 - 6402 2016年12月

Reduction of SDPs in H-infinity Control of SISO Systems and Performance Limitations Analysis 査読有り国際誌

Hayato Waki,Yoshio Ebihara,Noboru Sebe

55th IEEE Conference on Decision and Control 646 - 651 2016年12月

Evaluation of the ease of restarts in fault-tolerant control systems using multiple switching L2 gains 査読有り

Koichi Suyama,Noboru Sebe

Proc. of the 42nd Annual Conference of the IEEE Industrial Electronics Society paper ID: TTC-CSA4-6 (8 pages) 2016年10月

Dual LMI Approach to H-infinity Performance Limitations Analysis of Sensitivity and Complementary Sensitivity Functions 査読有り国際誌

Yoshio Ebihara,Hayato Waki,Noboru Sebe

Proc. of the IEEE Multi-Conference on Systems and Control 1440 - 1445 2016年09月

H-Infinity Performance Limitations Analysis for SISO Systems: A Dual LMI Approach 査読有り国際誌

Yoshio Ebihara,Hayato Waki,Noboru Sebe

54th IEEE Conference on Decision and Control 6629 - 6634 2015年12月

Robust Fuzzy Observer-Based Fault Tolerant Tracking Control for Nonlinear Systems with Simultaneous Actuator and Sensor Faults: Application to a DC Series Motor Speed Drive 査読有り

Katherin Indriawati,Noboru Sebe,Trihastuti Agustinah,A. Jazidie

International Review of Automatic Control 8 ( 6 ) 375 - 385 2015年12月

Tolerance against multiple fault modes and its application to corrective maintenance of faulty actuators in servo systems 査読有り国際誌

Koichi Suyama,Noboru Sebe

20th IEEE International Conference on Emerging Technologies and Factory Automation paper ID: 9 (8 pages) 2015年09月

Application of Facial Reduction to H-infinity State Feedback Control Problem 査読有り国際誌

Hayato Waki,Noboru Sebe

8th IFAC Symposium on Robust Control Design 112 - 118 2015年07月

New Switching L2 Gain Analysis for a Restart with Controller Resets after Maintenance 査読有り国際誌

Koichi Suyama,Noboru Sebe

8th IFAC Symposium on Robust Control Design 348 - 355 2015年07月

Rotation Matrix Optimization with Quaternion 査読有り国際誌

Shogo Katsuki,Noboru Sebe

Proceedings of Asian Control Conference 2015 paper ID:1570074907 (6 pages) 2015年06月

Effects of Diagonal Dominance on Performance of Passive Fault Tolerant Servo Systems 査読有り国際誌

Kenta Toyoda,Noboru Sebe,Koichi Suyama

Proceedings of Asian Control Conference 2015 paper ID:1570074897 (6 pages) 2015年06月

Lower bound analysis of H-infinity performance achievable via decentralized LTI controllers 査読有り国際誌

Yoshio Ebihara,Noboru Sebe

International Journal of Robust and Nonlinear Control 24 ( 16 ) 2423 - 2437 2014年11月

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