基于自抗扰控制器的电液力伺服加载系统

在航空关节轴承疲劳寿命及性能评价试验中,采用电液力伺服加载控制系统来模拟关节轴承在工作中所承受的真实运动和载荷。传统PID控制技术在工程实际中大量应用,但其具有对于复杂系统控制精度减低及对环境变化的适应能力不足的缺点,因此无法满足试验机在复杂条件下受力载荷的高性能受力要求。引入自抗扰控制器(ADRC),评估系统的状态信息和扰动信息,解决在极端条件、无扰动数学模型下对动态载荷谱加载的精确控制问题。通过仿真与实验证明:在外部条件相同的情况下,自抗扰控制器在电液力伺服加载系统中的控制效果优于PID控制,系统的响应速度、抗干扰能力以及鲁棒性显著提高。

Electro Hydraulic Servo Loading System Based on Active Disturbance Rejection Controller

In the evaluation of the aircraft fatigue life and the performance evaluation test, the electro hydraulic servo loading control system is used to simulate the real movement and joint load-bearing in the work. The traditional PID control technology is widely used in the engineering practice, but it has the disadvantages of poor control precision and adaptability to environmental change, so it can not satisfy the test machine in complicated conditions of the high stress load performance capacity requirements. The ADRC is designed to evaluate the state information and the disturbance information of the system, and to solve the problem of the precise control of the dynamic load spectrum under extreme conditions and without disturbance. The simulation and experiments prove that the ADRC controller is better than the PID control in the electro hydraulic loading system under same external conditions, and the response speed, anti-interference ability and robustness of the system are improved significantly.