Study of Dynamic Vibration Absorber Stabilizing a Circuit Pressure in a Water Hydraulic System

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The aim of this study is to obtain the stabilizing method of a high pressure water hydraulic supply system. The mathematical model has been derived as the system that the constant pump flow enters into a chamber which is connected with a poppet type safety valve, an output line terminated by a load restrictor, and accumulator as a dynamic absorber of vibration. The basic equations have been linearlized about the steady operating point. The effect of the main parameters on the system stability has been investigated by numerical simulation of the linearized equation and by experiment. Critical boundaries of stability are illustrated for the valve lift vs the supply pressure.Stability generally lowers as increase in the supply pressure. The damper installed to the valve shaft is particularly effective, and a sufficient damping coefficient can establish the complete stability over all region of the supply pressure. The complete stability is given also by a sufficient volume of the pump cha … More mber. Addition of an accumulator evidently improves the system stability. The geometry of the tube connecting the accumulator and the pump chamber markedly affects the stability, whose diameter and length have the optima. The shape of stability boundaries is not simple because defferent modes of unstable characteristic roots switches as change of the operating point. A higher charging gas pressure gives a better stability, but the pulsation of the pump is eliminated by a lower charging pressure.The theoretical model has been proved to be valid from experimental results of the static characteristics, the stability boundaries, and from the chaotic waveforms due to collision of the valve against the valve seat.Therefore, useful basic knowledges have been obtained for stabilizing method and active vibration control of the direct operating poppet valve circuit as a water hydraulic pressure regulator, and furthermore, for developement of a balanced piston type relief valve for a water hydraulics. Less