阀控电液伺服压力脉冲实验自抗扰控制方法

针对压力脉冲疲劳测试系统在测试过程中工件体积的不确定性以及脉冲疲劳测试系统的机械与液压双动态耦合问题,首先,提出通过奇异值摄动理论将压力脉冲疲劳测试系统的多动态耦合进行解耦降阶;然后,利用自抗扰控制算法实现对系统模型降阶误差以及体积参数不确定性等干扰的补偿,保证测试系统输出的压力对指令信号的准确跟踪;最后,对基于降阶模型的自抗扰算法的稳定性和误差收敛性进行理论和定量分析,并对算法的可行性和有效性进行联合仿真和实验验证.研究结果表明,基于降阶模型的自抗扰控制算法对压力脉冲疲劳测试系统中工件体积参数的变化具有良好的鲁棒性且能够有效估计和补偿系统模型降阶误差等干扰,其跟踪性能相比于传统的PID控制器最大提升35.4%.

Active disturbance rejection control method for valve-controlled electro-hydraulic servo pressure-pulse system

To address the uncertainty of the workpiece volume and the mechanical and hydraulic dynamic coupling of the test system during the test process, firstly, the multi-dynamic coupling of the pressure pulse fatigue test system is decoupled and downgraded by means of singular value uptake theory. Secondly, the compensation of the downgraded error and volume uncertainty of the system is achieved by using the active disturbance rejection control algorithm, so as to ensure the accurate tracking of the pressure output of the test system to the command signal. Finally, the stability and error convergence of the active disturbance rejection control algorithm based on the simplified model are theoretically and quantitatively analyzed. The feasibility and validity of the control method are verified by co-simulation and experiment. The results show that the active disturbance rejection control algorithm based on the reduced-order model has good robustness to the variation of workpiece volume parameters in the pressure pulse test system and can effectively estimate and compensate for the disturbances such as the reduced-order error of the system model, and its tracking performance is improved by up to 35.4% compared with that of the PID controller.