A design method of active disturbance rejection controller for linear motor servo systems

2008 ◽  
Author(s):  
Zhang Guozhu ◽  
Chen Jie ◽  
Li Zhiping
Keyword(s):  
Disturbance Rejection ◽  
Design Method ◽  
Linear Motor ◽  
Servo Systems ◽  
Active Disturbance Rejection

Turbojet Thrust Augmentation through a Variable Exhaust Nozzle with Active Disturbance Rejection Control

Aerospace ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 293
Author(s):  
Francisco Villarreal-Valderrama ◽  
Patricia Zambrano-Robledo ◽  
Diana Hernandez-Alcantara ◽  
Luis Amezquita-Brooks
Keyword(s):  
First Principles ◽  
Disturbance Rejection ◽  
Design Method ◽  
Ambient Pressure ◽  
Stream Velocity ◽  
Exhaust Gas ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Gain Margin

Turbojets require variable exhaust nozzles to fit high-demanding applications; however, few reports on nozzle control are available. The purpose of this paper is to investigate the possible advantages of an exhaust gas control through a variable exhaust nozzle. The control design method combines successful linear active disturbance rejection control (LADRC) capabilities with a loop shaping controller (LSC) to: (i) allow designing the closed-loop characteristics in terms of gain margin, phase margin and bandwidth, and (ii) increase the LSC disturbance rejection capabilities with an extended state observer. A representation of the nozzle dynamics is obtained from first principles and adapted to achieve a stream-velocity-based control loop. The results show that the resulting controller allows improving the expansion of the exhaust gas to the ambient pressure for the whole operating range of the turbojet, increasing the estimated thrust by 14.23% during the tests with experimental data.

scholarly journals Active Disturbance Rejection Control of Valve-Controlled Cylinder Servo Systems Based on MATLAB-AMESim Cosimulation

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Wenxiao Guo ◽  
Yanbin Zhao ◽  
Ruiqin Li ◽  
Haigang Ding ◽  
Jianwei Zhang
Keyword(s):  
Disturbance Rejection ◽  
Servo System ◽  
Constant Load ◽  
Variable Load ◽  
Active Disturbance Rejection Control ◽  
Servo Systems ◽  
Large Power ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Load Variable

The valve-controlled cylinder position servo system has the advantages of large output force and large power. As characteristics of nonlinearity and uncertainty exist in the hydraulic servo system, it is difficult for the traditional PID control to meet the requirements of high precision and control. The active disturbance rejection control (ADRC) considers the uncertainty of the system and external disturbances as the total disturbance. In this paper, the valve-controlled cylinder servo system is designed based on ADRC, its working principle is described, and its mathematical model and cosimulation model based on MATLAB-AMESim are established. In the case of constant load, variable load, and long pipeline, the comparative simulation of ADRC and PID is carried out. The simulation results show that the ADRC can effectively suppress the disturbance of the internal parameter changes and external load changes of the hydraulic system and has strong robustness and high control accuracy. This study provides a reference for the application of ADRC in electrohydraulic servo systems.

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