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中文摘要：
利用计算流体动力学（CFD）方法,获得了液动力、粘性力对先导阀芯位置的影响规律,反映了阀芯在减振器流量范围内呈现高频、低幅值的振动现象,分析了先导阀保持稳态位置和快速动态响应的关键因素.在溢流阀分析方面,建立了环形薄板在集中载荷、局部分布载荷、全局分布载荷作用下的几何非线性偏微分方程,指出了集中载荷和局部分布载荷按照双曲正切函数或者幂函数等效分布的规律,并利用有限元方法分析了溢流阀的瞬态开度规律.最终,基于相关数学模型、CFD计算结果和有限元分析仿真结论建立了整体的计算模型,并将整体流量仿真结果与实验结论进行了对比.结果表明,理论和实验具有较好的一致性,理论分析方法可行.
英文摘要：
This paper deals with the influences of the flow force and the viscous force on the final positions of a pilot valve by means of the CFD method.It describes the high-frequency low-amplitude vibration of the valve in the range of the damper flow and discusses the key factors which cause the pilot valve to keep a steady position and a rapid dy-namic response.For the relief valve, the geometrically-nonlinear partial differential equations of the annular plate un-der the concentrated, partially-distributed and globally-distributed loads are established.Then, it is pointed out that the distribution laws of the concentrated and partially distributed forces can be equivalently described by using the hy-perbolic tangent function or the power function.Furthermore, the FEA method is used to analyze the dynamic behav-ior of the relief valve.Finally, according to relevant mathematic models, CFD results and FEA conclusions, an inte-grated model is constructed, and the calculated results are compared with the experimental ones.It is found that the theoretical analysisis consistent with the experimental results and that the theoretical methods are feasible.
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