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本文在对液压油综合体积弹性模量影响因素分析的基础上,推导出了油液综合体积弹性模量随油压变化的理论模型及其简化形式。并采用互相关测速方法对系统的油液综合体积弹性模量进行了实测。引用线性最小二乘法拟合和非线性优化方法求解等手段,对各模型参数进行了辨识,并对各模型的精度进行了评价。以泵—管道—加载溢流阀系统为实例,证实了理论模型是正确的和试验测试方法是可行的。由此求得的模型使液压系统动态分析的精度大为提高。
Based on the analysis of the influencing factors of the bulk elastic modulus of the hydraulic oil, the theoretical model and the simplified form of the integrated volume elastic modulus of the oil with the hydraulic pressure are deduced. The cross-correlation velocity method was used to measure the integrated volume elastic modulus of the system. By means of fitting linear least squares method and solving nonlinear optimization methods, the parameters of each model were identified and the accuracy of each model was evaluated. Taking the pump-pipe-load relief valve system as an example, it is proved that the theoretical model is correct and the test test method is feasible. The model thus obtained greatly improves the accuracy of the dynamic analysis of the hydraulic system.