Application of H∞ theory in electro-hydraulic loading system of helicopter pitch adjusting booster
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摘要: 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．Abstract: A dynamic model of electric-hydraulic loading system was established based on the principle analysis of electro-hydraulic load simulator, which was applied to the earth-experiment of hydraulic assistor for the helicopter pitch adjusting. Controllers designed by conventional control theory were not effectual because of the uncertain factors such as difficulties in access to precise structure parameters of electric-hydraulic loading system and nonlinearity of loading flux in servo valve. Therefore the robust control strategy of electric-hydraulic loading system based on H∞ theory was investigated in this work. Through choosing suitable weight functions and using the designing method of mixed sensitivity, the robust controller was solved by the linear matrix inequality (LMI) algorithm. The experiment results prove the high efficiency and superiority of the robust force controller which is presented by this work.
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Key words:
- electro-hydraulic load simulator /
- force control /
- robust control /
- mixed sensitivity
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