Journal of South China University of Technology(Natural Science) >
Model Feedforward Compensation Active Disturbance Rejection Control for a Heavy-Duty Hydraulic Manipulator Arm
Received date: 2023-03-16
Online published: 2023-10-15
Supported by
the National Natural Science Foundation of China(51975587)
Hydraulically-driven heavy-duty manipulator arms are widely used in construction and mining machinery, and there is an urgent need for its automatic control in the industry. However, the strong parametric uncertainties and difficult-to-model dynamics of the hydraulic system and other factors bring certain challenges to its automatic control. This paper studied the position tracking control problem of a class of heavy-duty hydraulic manipulator arm driven hydraulic cylinders by taking an anchor drilling truck as an example, and proposed a model feedforward compensation active disturbance rejection controller. To solve the control problems caused by nonlinear factors such as variable load, dead zone, parametric uncertainties and friction under heavy loads, the study adopted the control method of combining model feedforward and active disturbance rejection feedback, and established the mechanism model of the system by combining the mechanism dynamics model of the heavy-duty hydraulic manipulator arm and the model of proportional valve-controlled hydraulic cylinders. Then based on the mechanism model of the system, it constructed the feedforward compensation part of the controller, and designed an extended state observer to observe the unmodeled factors of the system in real time, and the active disturbance rejection controller was constituted together with the feedback adjustments based on the state error. The experimental studies were carried out on a real heavy-duty hydraulic manipulator arm, and the results show that the model feedforward compensation active disturbance rejection controller has smaller hysteresis and tracking error than PID controller, and the overall tracking accuracy is improved by 63.5% compared with that of PID controller. This indicates that the designed controller can overcome the adverse effects of the nonlinear factors of the hydraulic system very well, and it has a higher robustness than the PID controller. Therefore, the designed control method is more suitable for the position tracking control of this kind of heavy-duty hydraulic manipulator arm.
GUO Xinping, HE Xin, WANG Hengsheng, et al . Model Feedforward Compensation Active Disturbance Rejection Control for a Heavy-Duty Hydraulic Manipulator Arm[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(4) : 59 -67 . DOI: 10.12141/j.issn.1000-565X.230115
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