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李, 連進 ; 長屋, 幸助
概要:
application/pdf<br />Journal Article<br />This paper presents a method for optimizing vibration absorbers on a flexible beam by means of a neural network procedure. Analytical results for the response of the beam with multi-absorbers
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have been obtained using a transfer matrix method. To achieve optimal control, a cost function composed of second-order nonlinear forms in terms of the displacement, strain, and frequencies was used. A method of minimizing the function was presented, in which input values, weights and output function were effectively controlled on the basis of the back-propagation procedure of the neural network method. Numerical calculations were carried out for an example problem. It is ascertained that the present method gives a better result than that obtained by the previously published method. The validity of the method and the analytical results was confirmed by experimental tests.
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| 2.
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長屋, 幸助 ; 横田, 勇
概要:
application/pdf<br />Journal Article<br />In the preceding related paper, the authors discussed a plate-type magnetic damper with alternative magnetic poles. The paper presented the analytical expressions of eddy currents in the conductor
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and the damping coefficients for the single row of alternative poles. The damping effects of the damper having alternative poles of a number of rows and columns are different from those of the previous model. The present article discusses the damping increasing mechanisms for the plate-type damper with alternative magnetic poles of a number of rows and columns. The analytical expression for finding the eddy current patterns and the damping coefficient are obtained. Numerical calculations are carried out for some important examples. Since the present article gives the analytical expression and the numerical data of dimensionless damping coefficients, the results may be used directly in the practical design of such devices as vibration absorbers.
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| 3.
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長屋, 幸助 ; 関口, 肇
概要:
application/pdf<br />Journal Article<br />A magnetic damper in which opposite poles are arranged by turns has great deal of damping effects as compared with a normal magnetic damper. However the reason of it has not been clarified, and the
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analysis has not been reported. To clarify the mechanisms of increasing dampings for the damper, this paper presents an analytical results for the eddy current, and the damping coefficient. Numerical calculations are carried out for some important examples, and the results are compared with those of the normal magnetic damper.
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長屋, 幸助 ; 小島, 宏行 ; 岩田, 浩明 ; 伊藤, 美津夫 ; 太田, 幸一
概要:
application/pdf<br />Journal Article<br />磁気ダンパとサーボモータを用いた,コンピュータによるパルス信号制御の開ループ位置決め系を提示し,この系の妥当性を検討した.解析では軸振動の影響を考慮し,ばね
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と連続体についての両結果を誘導して両者の比較検討を行い,通常の制御速度でのばね系による解析の妥当性を明らかにした.また軸を剛体とした場合の結果を示して軸振動の影響を検討した.さらに軸の強度設計の観点から,軸のねじりモーメントを与える式をも示した.
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