磁流变液减振器模拟工况实验台控制策略研究

Research on control strategy for simulation working condition test-bed of magneto-rheological fluid damper

为提高磁流变液减振器模拟工况实验台的控制精度,设计了基于扩张状态观测器的自抗扰控制器.该控制器为系统的目标期望信号安排了合理过渡过程,将系统的外部扰动和内部扰动作为广义扰动,设计了扩张状态观测器,利用扩张状态观测器利用系统输出的测量值来估计系统的状态变量和广义扰动的实时作用量,并在控制过程中对广义扰动进行补偿.仿真分析和实验结果表明,该控制器能够降低液压伺服系统固有的非线性和大范围变化的阻尼负载挠动对实验台鲁棒性能的影响,使实验台获得较高的控制精度和抗干扰能力.

To enhance the control precision of simulation working condition test-bed in the magneto-rheological fluid damper, an extended state observer based active disturbance rejection controller was presented. A reasonable transition of the system reference signals was arranged in the controller, and the external-disturbance and the internal-disturbance of system were referred to as generalized disturbance. An extended state observer was designed to estimate system state variables and the real-time effect of generalized disturbance using measured signals of the system output. The generalized disturbance was compensated in the control process. Simulation and experimental results show that the controller can attenuate the effect on the robust capability of the test-bed caused by the,inherent nonlinear character of the hydraulic servo system and the large range of damping force payload disturbances. The test-bed yields superior control precision and disturbance rejection ability.