摩擦加载式电液负载模拟器大幅值加载机构

摘要

To improve the loading amplitude of friction based electro-hydraulic load simulator in compact size by using existing friction material, a loading method using a large amplitude torque loading mechanism is proposed, the working principle of the mechanism is described and a mechanism is designed and developed. The mechanism' s finite element model is established then thermal-mechanical coupling simulation of the mechanism is conducted using ABAQUS software, and the feasibility of the mechanism is validated. The friction heat production characteristics and the friction heat impact on the loading mechanism are studied, and the simulation results indicate that in practical applications the mechanism needs fully heat dissipation. Using the developed loading mechanism, the original one-way friction based electro-hydraulic load simulator prototype is transformed as a large amplitude load simulator. Based on the transformed load simulator, under the control of a PID controller, the large amplitude torque loading experiments are conducted, and the experimental results indicate that the transformed load simulator can accurately track up to 70 N·m torque, the mechanism can improve the original load simulator' s torque loading amplitude by 3 times as expected i.e., the effectiveness of the mechanism is validated.%为在紧凑的结构尺寸下利用现有的摩擦材料大幅度提高摩擦加载式电液负载模拟器的加载幅值,提出利用大幅值力矩加载机构进行加载的方法.给出加载机构的工作原理,设计并研制一个加载机构样机;利用ABAQUS软件建立该机构的有限元模型,并对该机构进行动态热-力耦合仿真研究,验证该机构的可行性,研究摩擦热的产生特征及其对该机构的影响,发现实际应用时需要对该机构进行充分的散热;利用研制的加载机构,将原有的单向摩擦加载式电液负载模拟器样机改造为大幅值摩擦加载式电液负载模拟器,基于改造的负载模拟器,在PID控制器控制下进行了大幅值力矩加载实验.实验结果表明:改造后的负载模拟器能够精确跟踪高达70 N·m的力矩,该机构能够按设计预期将原有负载模拟器样机力矩加载幅值提高3倍左右,验证了该机构的有效性.