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针对航空飞行器关键部件疲劳性能评价试验系统准确模拟极端条件下载荷谱的要求,在电动缸载荷系统中通过设计自抗扰控制器(ADRC)估计系统的状态信息和扰动信息,解决在极端条件、无扰动数学模型条件下对规定载荷谱的精确控制问题;解决因极端条件变化带来的扰动和系统不确定性导致的系统稳定性问题。通过仿真试验,电动缸加载三阶系统的力闭环自抗扰控制系统在外部条件相同的条件下,自抗扰控制器的控制效果优于PID控制,响应速度更快,抗系统扰动能力更强,满足伺服电动缸加载控制系统加载精度高、试验评价系统载荷谱重复及一致性精度高的要求。
Aiming at the requirements of the fatigue spectrum evaluation system of key components of aero-aircraft accurately simulating the load spectrum under extreme conditions, the state information and perturbation information of the system are estimated through the design of ADRC in electric cylinder load system, Accurately control the specified load spectrum under the perturbed mathematical model; Solve the system stability problems caused by the disturbance caused by the extreme conditions and the system uncertainty. Through the simulation test, the closed-loop ADRC system with the third-order system loaded by the electric cylinder under the same external conditions, the ADRC controller has better control effect than the PID control with faster response and stronger anti-system disturbance ability , To meet the loading servo servo cylinder control system loading accuracy, test evaluation system load spectrum repetition and consistency of high precision requirements.