According to the oscillating flow in servo-controlled hydraulic piplines, the actual movement of the transient transition flow was considered. The momentum change of the fluid was analysised in the transient process based on considering its micro-compression, and an improved fluid dynamic model of pipeline was proposed. Based on the one-dimensional fluid transient theory, the analytical model of fluid transients in hydraulic piplines was carried out by the characteristic method and the finite difference method. The correctness of the simulation was approved by the comparison of calculation data with experiment data . The results show that these models give more reasonable descriptions for water hammer and flow oscillation during servo valve starting process and can provide guidance for designs and experiments of the hydraulic pipe system.%针对伺服阀控液压管路系统内部流体振荡问题,考虑了瞬变过渡流的实际运动过程,分析了动态过程中油液压缩性对油液动量的改变,建立了阀控液压管路系统动态数学模型.采用一维流体瞬变理论,利用特征线法及有限差分格式,对液压系统管路关机油击的瞬变流动进行数值分析,给出了特征线数学模型的计算方法,并通过实验进行了验证.研究结果表明:该分析方法能够合理、有效地描述系统瞬变特性和管路油击现象.可为其他管路系统的分析设计和优化提供指导.
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