Active Disturbance Rejection Control for Electro-hydraulic Proportional Servo Force Loading

被引：0
|
作者：
Wang L. [1 ]
Zhao D. [1 ]
Liu F. [2 ]
Meng F. [1 ]
Liu Q. [1 ]
机构：
[1] School of Mechanical Engineering, Yanshan University, Qinhuangdao
[2] Key Laboratory of Industrial Computer Control Engineering of Hebei Province, Yanshan University, Qinhuangdao
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2020年 / 56卷 / 18期
关键词：
Active disturbance rejection control; Dead-zone inverse compensation; Electro-hydraulic proportional loading system; Force control;
D O I：
10.3901/JME.2020.18.216
中图分类号：
学科分类号：
摘要：
To solve the problem of rough force control precision in electro-hydraulic proportional loading system, a cascade controller consisting of a dead-zone inverse compensation and a linear active disturbance rejection controller(LADRC) is proposed. Various disadvantages in the force control system are taken into account, including the non-linearity of the proportional valve dead-zone, hydraulic parameter perturbation, unknown external disturbances and so on. Based on the analysis of the mechanism of the electro-hydraulic proportional force loading system model, a second-order LADRC is designed, according to the relative order of the system. The "generalized disturbances" are estimated by a linear extended state observer (LESO) and compensated by a linear state error feedback control law(LSEF). In addition, the dead-zone inverse model is constructed to deal with the system output lag problem caused by the proportional valve dead-zone. The extensive comparative experiments show that the proposed approach improves the dynamic and static characteristics of the electro-hydraulic proportional loading system, achieves higher accuracy of force control, and possesses strong robustness and anti-interference, provides reference for engineering application. © 2020 Journal of Mechanical Engineering.
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页码：216 / 225
页数：9
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