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重载航空负载模拟器是用来模拟“C919”、“运-20”等重载飞机舵面工作载荷的地面仿真平台。设计了一种重载航空负载模拟器,采用非对称缸作为执行机构以在小体积下完成大载荷加载。为了消除多余力对重载航空负载模拟器加载精度的影响,分析了非对称缸正反向运动和大载荷变化下伺服阀流量增益的非线性变化对前馈补偿函数的影响,并设计了非线性参数估计控制器。同时分析了加速度等动态参数变化和静态参数的误差对多余力消除的影响,设计了参数最优控制器。仿真和试验结果均表明,相比于传统前馈补偿控制器,所设计的非线性最优前馈补偿控制器下的加载精度和多余力抑制能力提高了50%以上。
Heavy-load aircraft load simulator is used to simulate the “C919 ”, “transport -20 ” and other heavy aircraft rudder work surface load simulation platform. A heavy-load aeronautic load simulator was designed using an asymmetric cylinder as the actuator to accomplish high load loading in a small volume. In order to eliminate the influence of excess force on the loading accuracy of heavy load aeronautic load simulator, the influence of the nonlinear variation of the servo valve flow gain on the feedforward compensation function under asymmetric cylinder forward and backward motion and large load variation is analyzed. Linear Parameter Estimation Controller. At the same time, the influence of the variation of the dynamic parameters such as the acceleration and the static parameters on the elimination of excess force is analyzed, and the optimal controller of the parameters is designed. Simulation and experimental results show that compared with the traditional feedforward compensation controller, the loading accuracy and excess force rejection capability of the proposed nonlinear optimal feedforward compensation controller are improved by more than 50%.