一种新型摩擦电液加载系统的设计与验证

为解决传统负载模拟器受到被加载对象运动干扰的问题,提高实验室环境下负载模拟的精度,提出用执行机构或伺服驱动系统带载测试的摩擦电液加载方案.分析传统电液负载模拟器加载性能受被测试设备运动干扰的影响,设计一种基于摩擦加载的主动式电液力矩伺服加载系统.根据加载原理,建立摩擦加载系统的数学模型,分析数学模型结果表明,理想情况下摩擦加载方案不受被加载机构运动的影响.鉴于实际过程中系统存在多种变化参数,特别是具有不确定性和时变性的摩擦,仿真分析摩擦因数变化时摩擦电液加载系统的加载性能.仿真结果表明:传统电液负载模拟器受被测试设备运动影响很大,使得传统电液负载模拟器性能很难进一步提升;相对被动加载的传统模拟器性能,尽管摩擦因数会受相对运动、负载压力和温度等因素的影响在一定范围内变化,但摩擦电液加载系统仍能保持较高的力矩模拟精度.

Design and validation of a novel friction electro-hydraulic loading system

The conventional electro-hydraulic load simulator is subjected to motion disturbance of the tested equipment. To eliminate the disturbance, a novel friction electro-hydraulic loading system for testing actuators or servo drive systems is proposed to improve the accuracy of load simulation in the laboratory environment. The motion disturbance of the test equipment on conventional electro-hydraulic load simulator is analyzed. And an active electro hydraulic torque servo loading system based on friction loading is designed. According to the principle of loading, the mathematical model of the friction loading system is established. It shows that the friction loading scheme is not affected by motion of tested equipment. In view of the fact that there are many variable parameters in the actual process, especially time-varying and uncertain friction, simulations are made to analyze the loading performance of the friction electro-hydraulic loading system. Simulation results show that the conventional electro-hydraulic load simulator may be disturbed by motion of the tested equipment so greatly that Its loading performance is hard to be further promoted. Although the friction coefficient may be influenced by the relative motion, load pressure, temperature and other factors. the friction electro-hydraulic loading system can keep high precision torque simulation.