Abstract
This paper deals with numerical simulation of a balanced piston type water hydraulic relief valve. A mathematical model for the valve is derived as ordinary differential equations of 1 lth order and the validity of the model is examined by the comparison with experimental results. The simulation results qualitatively agree well with the experimental ones. Then, the model is linearized around a steady operating point. The stability of the system is studied by a root locus method and the effects of various structural parameters on the stability of the system are investigated. As a result, it is clarified that the middle chamber volume influences the stability of the system markedly.
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