数字开关液压系统管路压力波传播建模与分析

为准确描述数字开关液压系统管路压力波传播特性，应用基于传递函数与时间延迟的管路压力波传播分析模型，通过耦合高速开关阀输出流量特性与管路压力波传播分析模型，实现两位两通高速开关阀控缸系统管路压力波传播特性的建模与分析，讨论了不同参数下的管路压力波传播特性，并通过相应的实验加以验证。结果表明，实验结果与分析模型结果一致性较好，高速开关阀动态特性与系统管路压力波传播特性密切相关，管路属性对系统管路压力波传播过程影响显著，将为后续数字开关惯性液压系统的研究奠定基础。 

Modeling and analysis of pressure wave propagation inside pipeline of digital switched hydraulic system

In order to describe the characteristics of pressure wave propagation inside the pipeline in the digital switched hydraulic system accurately, an analytical model of pressure wave propagation inside the pipeline based on the transfer function and time delay was applied in this paper. By coupling the output flowrate characteristics of fast switching valve and pressure wave propagation analytical model, the model for pressure wave propagation characteristics inside pipeline in a hydraulic system controlled by two-position two-way fast switching valve was built and analyzed. The characteristics of pressure wave propagation inside pipeline under different parameters were discussed, and then validated in corresponding experiments. The results indicate that the experimental results are in good agreement with the results of the analytical model. The dynamic characteristics of the fast switching valve have a crucial impact on the pressure wave propagation effect inside the pipeline, which can be strongly affected by the pipeline properties. These will lay the foundation for further research of digital switched inertance hydraulic system.