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本文对液压系统中的流量压力脉动源一液压泵的频域数学模型作了研究。首先就航空中常用的平行轴向柱塞泵频域数学模型作了详细推导,说明该模型可以等效成一个源流量Q_S和源阻抗Z_S的并联模型,并揭示了Q_S、Z_S和泵内各参数之间的函数关系。然后讨论了一种Q_S的理论计算方法和Z_S的实验测试方法。最后,利用上述方法获得的Q_S和Z_S代入液压系统频域仿真程序后,得到某一系统的压力脉动理论计算值,并将它与同一系统的实验测得的压力脉动值比较,结果相当吻合,说明上述模型和计算测试方法是合理的。
This paper studies the frequency-domain mathematical model of hydraulic pressure pulsation source-hydraulic pump in hydraulic system. Firstly, the frequency domain mathematical model of parallel axial piston pump, which is commonly used in aviation, is deduced in detail. It shows that the model can be equivalent to a parallel model of source flow Q_S and source impedance Z_S, and reveals that Q_S, Z_S and The functional relationship between parameters. Then it discusses a theoretical calculation method of Q_S and Z_S experimental test method. Finally, Q_S and Z_S obtained by the above method are substituted into the hydraulic system frequency domain simulation program to obtain the theoretical calculation value of the pressure pulsation of a certain system and compare it with the experimentally measured pressure pulsation value of the same system. The results are in good agreement with each other, Explain that the above model and calculation test method is reasonable.