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基于对某直升机桨距调节液压助力器地面试验用电液负载模拟器的原理分析,建立了电液加载系统的动态模型.由于电液加载系统中存在着结构参数难以精确获取和伺服阀负载流量非线性等不确定性因素,采用传统的经典控制理论设计出的控制器难以奏效,为此研究了基于H∞理论的电液加载系统的鲁棒控制策略.选择适当的权函数,利用混合灵敏度的方法设计并且采用基于线性矩阵不等式的算法求解出鲁棒控制器.给出了使用鲁棒力控制器的试验结果,结果证明所设计鲁棒力控制器的有效性和优越性.
Based on the principle analysis of electro-hydraulic load simulator for ground test of a hydraulic booster for a helicopter pitch control, a dynamic model of the electro-hydraulic loading system is established.Because of the difficulty in obtaining the structural parameters and the load flow of the servo valve in the electro-hydraulic loading system Nonlinear and other uncertainties, the controller designed by the classical classical control theory is hard to work. Therefore, the robust control strategy of the electro-hydraulic loading system based on H∞ theory is studied. By choosing the appropriate weight function and using the mixed sensitivity The robust controller is solved by the method based on linear matrix inequality.The experimental results of using the robust controller are given.The results show the effectiveness and superiority of the designed robust controller.