液圧駆動システムにおける液柱分離を伴う流体過渡現象 : 第6報,油圧プレスの衝撃抑制のための最適弁制御法

概要

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A method for designing an optimal valve control is presented to suppress the shock due to the surge pressure caused by the rejoining of a separated column produced at various periods of an operationg cycle of a hydraulic machine press without reducing the cycle time. In this method, the time history of the input voltage signal for the valve, which controls a certain operation period (e. g. , decompression period) in an operating cycle, is assumed to be of N+1 stage break-line mode from a specified initial value to a final one ; the mode being characterized by the coordinates of N break points. These points are determined by a computer program which incorporates a simulation routine for the system dynamics together with a direct search algorithm so that a minimum value of valve operation time can be achieved under the prescribed conditions of no column separation or the magnitude of surge pressure being lower than an allowable value. Experiments carried out on a small-sized model hydraulic test circuit dynamically similar to a real machine in the 20-MN class suggest that the present method is very useful for the development of a high-performance hydraulic machine press with low shock as well as with rapid operating cycle.
社団法人日本機械学会の論文
1995-09-25