著者

鈴木 勝正

出版者

社団法人 日本フルードパワーシステム学会

雑誌

油圧と空気圧 (ISSN:02866900)

巻号頁・発行日

vol.13, no.6, pp.417-425, 1982 (Released:2010-10-21)

参考文献数

6

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Oil hammer generates for an instant much greater pressure than that supplied to the pipe line, and this is important, indeed, in terms of the safety of oil hydraulic equipments. If you can take advantage of this phenomenon to pick up only the high pressure for a very short period of time, you will be able to make such a hydraulic pressure intensifier as can convert the oil pressure, produced by a low pressure pump, into several times higher one. In the case of water, a hydraulic ram utilizing this idea by means of waterhammer has been long investigated. However, its discharge pressure is several tenths MPa at most. For the oil hydraulics, to the author's knowledge, no report is available on an intensifier by means of oil hammer. Then, you would need a quite different structure because about one hundred times higher pressure will usually be needed. In the present research, an intensifier on a new principle was developed with a view to convert an oil pressure of several MPa into several times higher one and, moreover, to make more easily than a traditional intensifier consisting of oil cylinders. The discharge volume of the intensifier and the pressure fluctuation in the pipe line are theoretically predictable with a good accuracy.

著者

土屋 研吾 鈴木 勝正 佐藤 三禄

出版者

一般社団法人 日本フルードパワーシステム学会

雑誌

日本フルードパワーシステム学会論文集 (ISSN:18803121)

巻号頁・発行日

vol.39, no.1, pp.7-12, 2008 (Released:2009-08-28)

参考文献数

8

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A parallel link mechanism with six degrees of freedom using electrohydraulic servo cylinders has large rigidity and support power. This feature is widely used for a driving device with multi degrees of freedom that has a heavy load or needs a large driving force. In this research, basic characteristics are revealed by experiment and theory. In the 1st report, the characteristics of the hydraulic servo system was considered, and a detailed mathematical model was made. A transfer function was obtained by linear approximation, and the frequency response was presented. In the 2nd report, nonlinear simulation was executed based on the detailed mathematical model. The frequency response obtained from the simulation agreed well with the experimental result. The appearance of fluctuation in each part was presented, and the influence of nonlinear characteristics was clarified. From this research, the dynamic characteristics between the input and output of one link that comprises a parallel link mechanism were clarified. However, the parallel link mechanism comprises a so-called interaction system where the displacement of one link influences those of other links through the end effector. In this report, the interaction that each link receives from one link is examined by experiment and nonlinear simulation. The appearance of interaction is presented when the input is a rectangular wave or sinusoidal wave. The frequency response of the interaction that each link receives is presented. It is clarified that the amplitude of the reference value for a link and the load mass has a large influence on the frequency response of interaction. It is also presented that Coulomb friction has a big influence on the result.