著者

中原 健志 佐藤 美紀子 紫合 治 並木 美太郎

雑誌

研究報告システムソフトウェアとオペレーティング・システム(OS) (ISSN:21888795)

巻号頁・発行日

vol.2015-OS-134, no.21, pp.1-8, 2015-07-28

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近年,分散処理の利用場面が増えつつあるが,多くの分散処理系では専用のプログラムを書く必要があり,プログラム変更の手間が大きい.本稿では既存のコマンドを分散して実行する分散シェルについて述べる.本シェルではデータの分割,合成とネットワークを介して利用可能なパイプの機能を追加し,コマンドをネットワークで繋がっている複数台の計算機で分散実行することでプログラムを改変せず手軽に分散処理を実現することを検討した.コマンドの分散実行については,各種の位置透過性が必要であるが,これらを分散向け OS である Plan9[1] の分散透過性を用いることでシェルに実現する.

著者

中原 健志 藤本 孝

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference

巻号頁・発行日

vol.2011, pp._107-1_-_107-8_, 2011

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An energy regenerative active vibration control method using piezoelectric actuators, class D drivers, output filters and sliding mode controllers is proposed by the authors. DC voltage sources are used as power sources in the previous study and capacitors which can store regenerated energy also can be used as power sources. Class D drivers and output filters consist of switches and passive electric elements. Therefore, systems using capacitors as power sources can be considered as semi-active systems. Voltages of capacitors used as power sources are not constant because the capacitors are charged and discharged in control processes. An advantage of the proposed method is that characteristics of closed-loop systems are independent from voltages of power sources when systems are in sliding mode conditions. The advantage is suitable for systems using capacitors as power sources. The validity of the semi-active control method based on the proposed method is shown by numerical simulations of a SDOF model.

著者

中原 健志 藤本 孝

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.862, pp.18-00017, 2018 (Released:2018-06-25)

参考文献数

15

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A semi-active vibration control technique using piezoelectric actuators with switched inductance shunts has been studied. This technique can be used for not only vibration suppression but also energy harvesting. In order to design semi-active vibration control systems and energy harvesters using this technique efficiently, it is necessary to analyze and understand the effects of design parameters on the performance of these systems. Responses of these systems to harmonic disturbance forces can be used for performance evaluation and previous studies analyze periodic responses of semi-active vibration control systems by assuming sinusoidal displacement responses and using method of harmonic balance. However, this control technique induces rectangular control forces and the displacement responses are distorted. Enhancing the control forces leads to stronger distortion of the responses and the validity of the assumption of the previous studies becomes lost. In order to overcome this problem, the authors have proposed to use shooting method which is a numerical method to calculate periodic solutions of non-linear systems without assuming certain forms of responses. This paper presents periodic responses obtained by shooting method with an improved non-dimensional model and the periodic responses are compared with ones obtained by method of harmonic balance. Furthermore, this paper considers not only the periodic responses but also non-periodic chaotic responses obtained by long term simulations with the non-dimensional model.