畠中 清史 (ハタケナカ キヨシ)

HATAKENAKA Kiyoshi

写真a

職名

講師

研究室住所

福岡県飯塚市川津680-4

Scopus 論文情報  
総論文数: 0  総Citation: 0  h-index: 2

Citation Countは当該年に発表した論文の被引用数

取得学位 【 表示 / 非表示

  • 東京大学 -  博士(工学)  1998年09月

学内職務経歴 【 表示 / 非表示

  • 2019年04月
    -
    継続中

    九州工業大学   大学院情報工学研究院   知的システム工学研究系   講師  

  • 2008年04月
    -
    2019年03月

    九州工業大学   大学院情報工学研究院   機械情報工学研究系   講師  

専門分野(科研費分類) 【 表示 / 非表示

  • 設計工学・機械機能要素・トライボロジー

 

論文 【 表示 / 非表示

  • 簡易熱流体潤滑モデルにもとづく真円軸受の新しい設計法

    畠中 清史, 本田 あおい

    トライボロジスト  ( 一般社団法人 日本トライボロジー学会 )  66 ( 7 )   2021年07月  [査読有り]

     概要を見る

    <p>This paper proposes a new THL bearing design method based on an improved version of a precedent method. The precedent method used a model expression prepared in advance to easily and quickly find a crucial predicted data of the maximum bearing temperature. Three expressions were prepared for three different values of journal eccentricity ratio, 0.25, 0.5, and 0.75. Which one of the three should be used was determined, based on the preliminarily obtained value of journal eccentricity ratio derived from the initially assumed bearing specifications. Two dimensionless temperature-rise parameters <i>κ</i><sub>1 </sub>and <i>κ</i><sub>2 </sub>were introduced for the common variables of the expression. On the other hand, the new improved method uses a single expression, which is obtained by applying multiple regression analysis and <i>t</i>-test, for the crucial temperature for any value of journal eccentricity ratio. Furthermore, the new expression explicitly includes the four well-known dimensionless numbers used in THL analysis, that is, Sommerfeld number, bearing width-to-dimeter ratio, Peclet number and Khonsari number. The model expressions for other bearing characteristic performances were obtained in the same way. Compared with some measurements in test rigs of cylindrical bearings, the new improved method is confirmed to predict reasonably accurate bearing performances of cylindrical bearings faster and more easily than the precedent method over a wide range of operating conditions.</p>

    DOI CiNii

  • バンプフォイル軸受の理論最大負荷容量に及ぼすトップフォイル変形解析モデルの影響(第2報):―アイソパラメトリックシェル要素の適用―

    畠中 清史

    トライボロジスト  ( 一般社団法人 日本トライボロジー学会 )  66 ( 5 ) 372 - 383   2021年05月  [査読有り]

     概要を見る

    <p>Bump foil journal bearings are prospective applicants that can support a small-sized rotor of high-speed rotating machinery. The performance characteristics of the bearings are predicted by using a model bearing. When the air film thickness can be assumed to be uniform in the axial direction, a finite element (FE) model using curved beam element is appropriate to be applied in analyzing the displacement of bearing surface which is referred to as top foil. On the other hand, the top foil need be replaced with a thin shell in order to predict the performances of the bearing that has non-uniform air film thickness in the direction. In this study, an isoparametric shell element, which can couple the membrane and the bending effects of top foil, is introduced into the deformation analysis instead of a plate shell element adopted in the previous paper. The replacement of FE model is found to have a large influence on the bearing performance because of the change in the air film characteristics. It is concluded that the isoparametric shell element is appropriate in predicting the performance of the bearing that has non-uniform air film thickness in the axial direction.</p>

    DOI CiNii

  • 簡易熱流体潤滑理論にもとづく軸受最高温度の時刻歴

    畠中 清史

    トライボロジスト  ( 一般社団法人 日本トライボロジー学会 )  66 ( 5 ) 384 - 396   2021年05月  [査読有り]

     概要を見る

    <p>An overshoot phenomenon of bearing temperature in hydrodynamic journal bearings may be observed during a sudden start-up experiment. This phenomenon implies that the maximum bearing temperature in acceleration operation may exceed the predicted one which can be predicted accurately by applying a state-of-the-art steady-state thermohydrodynamic lubrication (THL) model. This paper presents the maximum bearing temperature including the one during acceleration operation by using a simplified THL model that is newly proposed for a transient THL analysis. It is found that the overshooted temperature can be qualitatively predicted by using the transient THL model that incorporates properly the interaction between the motion of journal center and the viscous dissipation, even if it is a simple model. Next, the transient temperature during slow acceleration operation and also those toward higher dimensional steady-state journal rotational speed are calculated and they are found to be in qualitative agreement with the measurements. The oil film characteristics such as oil film pressure, temperature and thickness after reaching the steady-state equilibrium do not depend on the value of initial journal eccentricity ratio in the transient analysis. However, when the values are different, the characteristics immediately after starting rotation change largely. In the case of the value 1.00, it is found to give a prediction that agrees qualitatively with the characteristics measured in the experiment.</p>

    DOI CiNii

  • A New Design Chart Method of Journal Bearings Based on a Simplified Thermohydrodynamic Lubrication Theory

    Kiyoshi Hatakenaka

    Tribology Transactions    63 ( 5 ) 935 - 945   2020年10月  [査読有り]

     概要を見る

    © 2020 Society of Tribologists and Lubrication Engineers. This article proposes a new thermohydrodynamic (THD) bearing design method based on an improved version of a precedent method. The precedent method used two charts prepared in advance to easily and quickly find two crucial predicted data of the maximum bearing temperature and the effective temperature of the bearing oil film to be used later in an isoviscous Reynolds equation. Three sets of charts were prepared for three different values of journal eccentricity ratio, 0.25, 0.5, and 0.75. Which set should be used was determined based on the preliminarily obtained value of journal eccentricity ratio derived from the initially assumed bearing specifications. Two dimensionless temperature rise parameters (Formula presented.) and (Formula presented.) were introduced for the common coordinate variables of the two charts. On the other hand, the new improved method uses a single set of charts for the two crucial temperatures for any value of journal eccentricity ratio. Furthermore, the two coordinate variables for each chart explicitly include the four well-known dimensionless numbers used in THD bearing analyses; that is, Sommerfeld number, bearing aspect ratio (L/D), Peclet number, and dimensionless temperature–viscosity index of the lubricant oil. Compared with some measurements in test rigs of cylindrical bearings, the new improved method is confirmed to predict reasonably accurate bearing performances of cylindrical bearings faster and more easily than the precedent method over a wide range of operating conditions. In conclusion, the new method is simpler, easier, and more straightforward for bearing design use than the precedent method.

    DOI Scopus

  • A new THL model for high accuracy of predicted journal surface temperature

    Hatakenaka K., Baba Y., Kameyama Y.

    Tribology Online    15 ( 4 ) 194 - 200   2020年07月  [査読有り]

     概要を見る

    2018年5月に公表された和論文「ジャーナル表面温度の予測精度を高める新たな熱流体潤滑モデル」の英訳版.オリジナリティはないものの,和論文とは別の校閲過程を経ている.
    A thermo-hydrodynamic lubrication (THL) theory is applied to journal bearings that support large-sized high-speed rotary machineries and it is confirmed that the maximum pad surface temperature under operation is below an allowable limit value. The temperature predicted by the traditional THL model is in good agreement with the measurement. However, the predicted journal surface temperature is not comparable with the measurement. In the present paper, it is firstly shown that the amount of heat, which is generated by the shear flow in the oil film and is discharged out of the film, is evaluated appropriately in the film near the pad surface while it is evaluated excessively in the film near the journal surface. Secondly, a new THL model is proposed that the oil film temperature near the pad surface and the temperature near the journal surface are obtained independently, that is, the conventional energy equation for the oil film is solved for the former temperature while the equation described in the relative coordinate system with the journal surface as the reference one is used for the latter temperature. Lastly, it is shown that the THL model can predict the journal surface temperature comparable with the measurement without deteriorating the accuracy of the predicted maximum pad surface temperature.

    DOI Scopus

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口頭発表・ポスター発表等 【 表示 / 非表示

  • 高速すべり軸受の油膜幅縮小に関する研究(第1報)― 油膜観察実験 ―

    上月康史,畠中清史

    日本機械学会九州支部第74期総会講演会  (Web開催(福岡大学工学部))  2021年03月  -  2021年03月    日本機械学会九州支部

     概要を見る

    講演番号C24

  • 動圧フォイル軸受の流体潤滑特性に及ぼすトップフォイル変形解析モデルの影響

    畠中清史

    トライボロジー会議2020秋 別府  (日本 Web開催)  2020年11月  -  2020年11月   

  • 簡易熱流体潤滑理論にもとづく真円軸受の新しい設計法

    畠中清史,本田あおい

    トライボロジー会議2020秋 別府  (日本 Web開催)  2020年11月  -  2020年11月   

  • 簡易熱流体潤滑理論にもとづくパッド表面最高温度の時刻歴

    畠中清史

    トライボロジー会議2020秋 別府  (日本 Web開催)  2020年11月  -  2020年11月   

  • 動圧型空気フォイル軸受の流体潤滑特性

    畠中清史

    トライボロジー会議2019春 東京  (日本 東京)  2019年05月  -  2019年05月   

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科研費獲得実績 【 表示 / 非表示

  • 超高速浮動ブッシュ軸受に関する研究

    若手研究(B)

    研究期間:  2002年04月  -  2004年03月

    研究課題番号:  14750101

 

担当授業科目 【 表示 / 非表示

  • 2020年度  解析Ⅱ

  • 2020年度  サーモダイナミックス

  • 2020年度  解析Ⅰ・同演習

  • 2019年度  トライボロジー特論

  • 2019年度  解析Ⅱ

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