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

本研究的目的是获得高压水压供水系统的稳定方法。建立了恒定流量进入泵室的数学模型，该系统由锥形安全阀连接，输出线由负载限制器终止，蓄能器作为动态减振器。对稳态工作点的基本方程进行了线性化。通过对线性化方程的数值模拟和实验，研究了主要参数对系统稳定性的影响。图中显示了阀门升程与供气压力之间的稳定性临界界限。稳定性一般随着供气压力的增加而降低。安装在阀轴上的阻尼器特别有效，足够的阻尼系数可以在供应压力的所有区域建立完全稳定。泵Cha…的足够体积也给出了完全的稳定性更多的记忆。增加了一个蓄能器，明显提高了系统的稳定性。连接蓄能器和泵室的管子的几何形状对稳定性有显著影响，管子的直径和长度都存在最佳值。由于不稳定特征根的不同模式会随着工作点的变化而切换，所以稳定边界的形状并不简单。充气压力越高，稳定性越好，但充气压力越低，泵的脉动越小。通过静态特性、稳定性边界和阀座碰撞产生的混沌波形的实验结果，验证了理论模型的正确性。因此，对于作为水压调节器的直动式锥阀回路的稳定方法和振动主动控制，以及水液平衡柱塞式溢流阀的研制，都获得了有益的基础知识。较少

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