Nonlinear adaptive robust control of electro-hydraulic servo systems with discontinuous projections

2002 ◽  
Author(s):  
Bin Yao ◽  
Fanping Bu ◽  
G.T.-C. Chiu
Keyword(s):  
Robust Control ◽  
Adaptive Robust Control ◽  
Servo Systems ◽  
Hydraulic Servo

scholarly journals Adaptive Robust Position Control of Electro-Hydraulic Servo Systems with Large Uncertainties and Disturbances

2022 ◽  
Vol 12 (2) ◽  
pp. 794
Author(s):  
Manh Hung Nguyen ◽  
Hoang Vu Dao ◽  
Kyoung Kwan Ahn
Keyword(s):  
Neural Network ◽  
Control System ◽  
Robust Control ◽  
Position Control ◽  
Sliding Mode ◽  
Adaptive Robust Control ◽  
Lyapunov Theory ◽  
Reference Trajectory ◽  
Servo Systems ◽  
Hydraulic Servo

In this paper, a novel adaptive robust control (ARC) scheme is proposed for electro-hydraulic servo systems (EHSSs) with uncertainties and disturbances. All dynamic functions in system dynamics are effectively approximated by multi-layer radial basis function neural network (RBF NN)-based approximators with online adaptive mechanisms. Moreover, neural network-based disturbance observers (NN-DOBs) are established to actively estimate and efficiently compensate for the effects of not only the matched/mismatched but also the imperfections of RBF NN-based approximators on the control system. Based on that, the nonlinear robust control law which integrates RBF NNs and NN-DOBs is synthesized via the sliding mode control (SMC) approach to guarantee the high-accuracy position tracking performance of the overall control system. Furthermore, the problem of the combination between DOBs and RBF NNs is first introduced in this paper to treat both disturbances and uncertainties in the EHSS. The stability of the recommended control mechanism is proven by using Lyapunov theory. Finally, numerical simulations with several distinct frequency levels of reference trajectory are conducted to convincingly demonstrate the effectiveness of the proposed approach.

scholarly journals Nonlinear Adaptive Robust Control of the Electro-Hydraulic Servo System

2020 ◽  
Vol 10 (13) ◽  
pp. 4494 ◽  
Author(s):  
Lijun Feng ◽  
Hao Yan
Keyword(s):  
Robust Control ◽  
Position Control ◽  
External Disturbance ◽  
Servo System ◽  
Adaptive Robust Control ◽  
Superior Performance ◽  
Parametric Uncertainties ◽  
State Equations ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This paper focuses on high performance adaptive robust position control of electro-hydraulic servo system. The main feature of the paper is the combination of adaptive robust algorithm with discrete disturbance estimation to cope with the parametric uncertainties, uncertain nonlinearities, and external disturbance in the hydraulic servo system. First of all, a mathematical model of the single-rod position control system is developed and a nonlinear adaptive robust controller is proposed using the backstepping design technique. Adaptive robust control is used to encompass the parametric uncertainties and uncertain nonlinearities. Subsequently, a discrete disturbance estimator is employed to compensate for the effect of strong external disturbance. Furthermore, a special Lyapunov function is formulated to handle unknown nonlinear parameters in the system state equations. Simulations are carried out, and the results validate the superior performance and robustness of the proposed method.

Research of a Robust Control for Electro Hydraulic Servo System

2014 ◽  
Vol 986-987 ◽  
pp. 1103-1107
Author(s):  
Xiao Gang Tang ◽  
Chao Zhang
Keyword(s):  
Robust Control ◽  
Pid Control ◽  
Pid Controller ◽  
Manufacturing Industry ◽  
The Novel ◽  
Servo Systems ◽  
Novel Approach ◽  
Aerospace Manufacturing ◽  
Control Scheme ◽  
Hydraulic Servo

In recent years, electro hydraulic servo systems are more and more widely used in the aerospace, manufacturing industry and the agricultural machinery. As a result, higher requirements are put forward for the performance and application environment, including better tracking precision and respond speed. Aiming at the shortcomings of conventional PID controller, such as the large overshoot, long transfer time and poor robustness performance, a robust control scheme with dual-loop structure is proposed in this paper. Simulation results show that better performances are acquired in the novel approach in contrast with the PID control scheme and the structure of the proposed scheme is simple and easy to implement.

Uniform robust exact differentiator-based output feedback adaptive robust control for DC motor drive systems

2020 ◽  
pp. 014233122097413
Author(s):  
Zhangbao Xu ◽  
Qingyun Liu ◽  
Xiaolei Hu
Keyword(s):  
Robust Control ◽  
Output Feedback ◽  
Control Method ◽  
Dc Motor ◽  
Adaptive Robust Control ◽  
Parametric Uncertainties ◽  
Servo Systems ◽  
Position Signal ◽  
Drive Systems ◽  
The Stability

This paper studies a high-accuracy motion control method named output feedback adaptive robust control for a dc motor with uncertain nonlinearities and parametric uncertainties, which always exist in physical servo systems and deteriorate their tracking performance. As only position signal is measurable, a uniform robust exact differentiator (URED) for the unmeasurable states and adaptive control for the parametric uncertainties are integrated in the model compensation term; and the robust control is applied to handle uncertain nonlinearities and stabilize the system. Then, the stability of the closed-loop system is proved theoretically. Finally, simulation and experimental results are studied for a dc motor system to prove the control performance of the proposed control method.

Sign in / Sign up

Export Citation Format

Share Document