某舵机上电液伺服阀有限元动态仿真

摘要

Study the dynamic performance of the whole electro - hydraulic servo valve used in pilot. As the traditional method utilizes concentrating parameters to set simplified models which ignore lots of factors, the system precision is poo. To solve this problem, the finite element method was used for the 3D modeling and simulation of the fluid components in the jet pipe assembly, the electromagnetic of the torque motor and the mechanics of the feedback lever assembly. Then the important data obtained in the analysis of every physical field were fitted using the toolbox in Matlab. Then program in M - function used the fitting results with the method of interpolation to accomplish the dynamic co - simulation of the multi - physics. Simulation results show that this method is of real - time and has a high authenticity, it can be a good simulation of the working process of the electro - hydraulic servo valve in actual situation , and the simulation results are very close to the actual performance characteristics of the product, so this method is able to provide a reliable basis for the design of servo valves with different structures.%对某舵机上电液伺服阀整体的动态性能进行研究,由于传统方法采用集中参数建立简化模型,忽略的因素较多,系统精度差.为解决上述问题,对电液伺服阀的射流管的流体部分,力矩马达的电磁部分及反馈杆组件结构力学部分分别采用不同的有限元软件进行三维建模仿真,并将各物理场中分析所得的重要数据在Matlab的tool工具箱中分别进行拟合,并采用M函数进行编程,将上述拟合结果以插值的方式进行多物理场的动态联合仿真.仿真结果表明,改进方法真实性高,实时性好,能较为真实的模拟实际情况下电液伺服阀的工作过程,仿真结果与产品的实际性能特征相吻合,能够为不同结构的伺服阀的设计提供可靠的依据.