基于动网格的旋转液压伺服关节动态特性研究

Dynamic Characteristics of Rotary Hydraulic Servo Joint Based on Dynamic Mesh

基于Fluent软件提供的计算方法和物理模型,利用动网格及UDF技术对旋转液压伺服关节运动过程进行了动态数值模拟。通过动网格技术较好地解决了因阀体运动而导致的计算区域瞬时变化的问题。分析了工作腔排量、阀芯转速、阀芯输入转角、系统压力和外负载力矩等参数对关节动态响应特性的影响。结果表明:该关节的工作腔每弧度排量取2.7×10-5m3最为合适,同时还发现阀芯输入转角、系统压力和外负载力矩等参数均对关节动态特性影响较大,而阀芯转速对其影响较小。所得结论可为关节的优化设计、试验提供理论参考。

Based on the calculation methods and physical models of Fluent software,the dynamic numerical simulation of the movement of rotary hydraulic servo joint was conducted by the dynamic mesh and UDF.The problem of regional instantaneous change in the calculation area which was caused by the valve body moving was well solved by the dynamic mesh technique.The factors which affected the dynamic response characteristics of joint were discussed,such as the working chamber volume,the valve spool speed,the valve core input angle,the system pressure,the external load torque and so on.The results show that：the most suitable displacement of per radian in the working chamber of the joint should be set at 2.7 × 10-5 m3.The valve core input angle,the system pressure and the external load torque have a greater impact on the dynamic characteristics of joint,while the valve spool speed has less.The conclusions can provide a theoretical reference for the optimal design and experiment of joint.