【摘要】 本文提出了一种在位移控制单油缸电液伺服振动台上再现加速度目标谱的方法。在原振动台系统PID位移控制的基础上,引入迭代学习控制算法ILC,建立外部离线offline迭代控制系统模型,实现加速度误差计算,并通过加速度频域二次积分方法,完成加速度误差结果与位移参量的转换,用于修正振动台位移控制输入,从而确保位移控制下目标加速度的轨迹再现。仿真实验结果表明,该方法能够在单油缸位移控制电液伺服振动台上再现加速度谱,控制精度符合误差要求。为在单油缸电液伺服振动台上进行振动特性模拟试验提供了可以借鉴的方法,具有一定的工程应用价值。更多还原

【Abstract】 In this paper,a method is presented,which replicates the acceleration spectrum on an electro-hydraulic servo test rig with displacement control.Based on the displacement PID control in traditional test rig system,the algorithm of iterative learning control(ILC) is introduced to construct an offline outer iterative control model,which can calculate the error between acceleration signals measured on specimen and target signals.The transformation from acceleration error to displacement parameter is realized with the method of twice-integration in acceleration frequency domain.The resulting displacement error is used to correct the input of the controller,and ensure the track replication of the target acceleration under displacement control.Simulation experiment result shows that the proposed method can appropriately reproduce the acceleration spectrum on single cylinder electro-hydraulic servo test rig;and the control accuracy meets the error requirement.The method provides a very significant approach for vibration & road simulation testing on single cylinder electro-hydraulic servo test rig.更多还原