摘要
飞机结构强度试验采用经典比例、积分、微分(PID)控制进行试验载荷控制。低载下整定的PID在整个试验过程中保持不变,高载下,结构试验外界条件可能发生较大改变,不可变PID难以适应高载试验状态,载荷控制精度变化较大,而自适应PID的研究又难以适用于商业控制设备。为此,基于AMESim软件,给出3种伺服控制信号的补偿方法,以适应时刻变化的试验状态,降低高载时载荷误差,并对3种方法进行比较,最后确定伺服控制信号自补偿技术对载荷误差控制较为有效。
A proportion-integration-differentiation(PID) controller is a generic control loop feedback mechanism widely used in full scale aircraft structural fatigue testing.In testing,PID cannot be changed after tuned.In high load,when control accuracy decreases severely,the stiffness of test article has been changed seriously.It is difficult to adapt the testing state for fixed PID.So load oscillation and attacking in testing may occur,which affects testing operation.To solve the problem,three methods are given based on AMESim to compensate the valve output signal in real time to decrease load oscillation.Finally,a self compensation technology of valve output signal can control load error efficiently.
引文
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