新型电液负载模拟器建模及仿真研究

Modeling and Simulation Research for a New Type Electro-hydraulic Load Simulator

针对传统的负载模拟器中存在的多余力矩问题,提出了一种基于摩擦力矩加载的新型电液负载模拟器,介绍了它的工作原理,建立了加载系统的数学模型,通过分析该新型负载模拟器主要存在的摩擦系数变化导致的控制对象不确定问题,选用模糊自适应整定PID控制方法来满足一定范围内摩擦系数变化的控制要求。仿真结果表明,该智能控制方法与传统的PID控制相比,能够满足更大范围的摩擦系数变化时的控制要求,而且在控制精度和鲁棒性等指标上都比传统的PID控制有很大的改善。

For the purpose of solving the traditional surplus torque problems in the load simulator,we present a new typeelectro-hydraulic friction torque loading model device and introduce its working principle and mathematical model. Through the analysis of the ever-changing friction coefficient which leads to uncertain problems of the control object in the load simulator,the fuzzy self-adaptation PID control is designed to satisfy the controlling demands that the friction coefficient changes in a certain range. The results show that the new intelligent method can not only satisfy the requirement when the wider friction coefficient changes,but also improve control accuracy and robustness well compared with the traditional PID control.