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为验证液阻悬置动特性所具有的不动点、高频储能动刚度趋于定值、非线性集总参数模型及其参数识别方法的有效性,对节流孔形状和大小不同的两种节流孔式液阻悬置进行试验研究及参数识别。结果表明:上述结论正确,而且可将流经节流孔的流体流动视为流经某等效长度的惯性通道的流体流动,实现节流孔式与惯性通道式液阻悬置在力学模型上的统一。在此基础上,提出了流体流经节流孔或惯性通道时局部损失系数的识别方法。对带节流盘和不带节流盘的两种节流孔式液阻悬置的流体局部损失系数的识别结果及基于非线性集总参数模型的数值试验结果表明:节流盘降低高频动刚度的原因是其扰流作用增大了流体紊流导致的能量损失,二阶非线性流体阻尼作用增强,从而有效抑制了惯性液柱的共振响应。这是阐释节流盘降低高频动刚度的作用机理的有益尝试。
In order to verify the dynamic characteristics of the hydraulic resistance suspension with fixed point, high frequency storage stiffness tends to set value, the nonlinear lumped parameter model and its effectiveness of parameter identification methods, the throttle shape and size of two different Experimental study and parameter identification of orifice throttling. The results show that the above conclusion is correct and the fluid flow through the orifice can be regarded as the fluid flow through the inertia passage of some equivalent length so that the orifice and the inertial passage fluid resistance can be suspended on the mechanical model Unity. On this basis, the method of identifying the local loss coefficient when the fluid flows through the orifice or the inertial channel is proposed. The identification results of the local loss coefficients of fluid with two kinds of throttling fluid-suspension with throttle plate and without throttle plate and the numerical test results based on the non-linear lumped parameter model show that the throttle plate reduces the high frequency The reason of the dynamic stiffness is that its turbulent flow increases the energy loss caused by the fluid turbulence and the damping effect of the second-order nonlinear fluid is enhanced, thereby effectively suppressing the resonant response of the inertial liquid column. This is a beneficial attempt to explain the mechanism by which the throttle disc reduces high-frequency dynamic stiffness.