scholarly journals Vibration Control of a Semiactive Vehicle Suspension System Based on Extended State Observer Techniques

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ze Zhang ◽  
Hamid Reza Karimi ◽  
Hai Huang ◽  
Kjell G. Robbersmyr
Keyword(s):  
Vibration Suppression ◽  
Control Method ◽  
Mr Damper ◽  
State Observer ◽  
Extended State Observer ◽  
Extended State ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Feedback Control Method ◽  
Vehicle Suspension System

A feedback control method based on an extended state observer (ESO) method is implemented to vibration reduction in a typical semiactive suspension (SAS) system using a magnetorheological (MR) damper as actuator. By considering the dynamic equations of the SAS system and the MR damper model, an active disturbance rejection control (ADRC) is designed based on the ESO. Numerical simulation and real-time experiments are carried out with similar vibration disturbances. Both the simulation and experimental results illustrate the effectiveness of the proposed controller in vibration suppression for a SAS system.

scholarly journals Active vibration suppression for rolling mills vibration based on extended state observer and parameter identification

2019 ◽  
Vol 39 (2) ◽  
pp. 435-450 ◽  
Author(s):  
Xinxin Wang ◽  
Xiaoqiang Yan
Keyword(s):  
Rolling Mill ◽  
Vibration Suppression ◽  
Control Method ◽  
Work Roll ◽  
State Observer ◽  
Extended State Observer ◽  
Thin Strip ◽  
Extended State ◽  
Rolling Mills ◽  
Equivalent Mass

Rolling mills vibration is a key factor that hinders the production of thin-strip steel. Currently, vibration is mainly suppressed by adjusting rolling mill parameters which is not a common approach. Due to special working conditions, the information of work roll, such as displacement and velocity, cannot be directly measured. Therefore, based on extended state observer, new resonance ratio control method, which is a common approach, is proposed to suppress the rolling mill vibration. First, the equivalent mass of the back roll is identified. Then, the interaction force between the work roll and the back roll and the velocity of the back roll are estimated using the extended state observer. Finally, these values are introduced into the input of the servo valve to compensate. The simulation results indicate that vibrations of both the work roll and the back roll are suppressed, and this method has a great tolerance for the identification error of the back-roll equivalent mass, and extended state observer compensation possesses a more superior vibration suppression than disturbance observer compensation.

Decoupled disturbance rejection control for a turbocharged engine with a dual-loop exhaust gas recirculation system

2017 ◽  
Vol 232 (5) ◽  
pp. 599-615
Author(s):  
Song Chen ◽  
Fengjun Yan
Keyword(s):  
Disturbance Rejection ◽  
Exhaust Gas Recirculation ◽  
State Observer ◽  
Extended State Observer ◽  
Intake Manifold ◽  
Exhaust Gas ◽  
Extended State ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Gas Recirculation

Dual-loop exhaust gas recirculation with a variable-geometry turbocharger is an effective architecture for achieving desired intake manifold conditions, such as the temperature, the pressure and the oxygen concentration of the intake manifold, which have critical roles in advanced combustion mode control. However, the widely used control-oriented model is derived on the basis that the heat transfer between the pipes and the gas is negligible, which means that it suffers from non-trivial errors. Simulation results show that other error sources, including the volumetric efficiency and the orifice equation, are difficult to calibrate accurately and also cause significant errors in the system, particularly in transient situations. Modified active disturbance rejection control with an extended state observer is utilized to deal with the non-linear, multiple-input multiple-output system in this paper. It is demonstrated that the performance of active disturbance rejection control mainly depends on the performance of the extended state observer. In this paper, an extended state observer, which is based on the sliding-mode concept rather than the conventional linear observer, is introduced. By taking advantage of its strong robustness, the system is decoupled into three loops. For each loop, the internal errors and the external errors, including the modelling error and the coupling effects, are lumped into one term; they are then actively estimated and cancelled out by the control input in real time. The proposed method was validated using calibrated GT-Power model simulations.

Control system of the six-axis serial manipulator based on active disturbance rejection control

2020 ◽  
Vol 17 (4) ◽  
pp. 172988142093947
Author(s):  
Xing Li ◽  
Bingyou Liu ◽  
Lichao Wang
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Disturbance Rejection ◽  
State Observer ◽  
Extended State Observer ◽  
Active Disturbance Rejection Control ◽  
Extended State ◽  
Parameter Uncertainties ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

This study considers the problems of manipulators with high coupling, parameter uncertainties, and external disturbances. A six-axis serial manipulator control system based on active disturbance rejection control strategy is proposed without the requirement of the exact dynamic model. First, the operating circuit of the manipulator joint motor is analyzed, and the mathematical model of the direct-current torque motor is established. Second, the components of active disturbance rejection control are designed, and a new nonlinear function is selected to construct the extended state observer and nonlinear state error feedback control law. Then, Kalman filter is introduced into an extended state observer to estimate the disturbance efficiently. Finally, the proportion–integration–differentiation control, traditional active disturbance rejection control, and improved active disturbance rejection control are simulated and compared under the same input signal. The results show that the proposed control strategy has good dynamic performance and uncertain disturbance robustness, which proves the effectiveness of the proposed method.

Spatial trajectory tracking control for unmanned airships based on active disturbance rejection control

2018 ◽  
Vol 233 (6) ◽  
pp. 2231-2240 ◽  
Author(s):  
Wenjie Lou ◽  
Ming Zhu ◽  
Xiao Guo
Keyword(s):  
Trajectory Tracking ◽  
Disturbance Rejection ◽  
State Observer ◽  
Extended State Observer ◽  
Active Disturbance Rejection Control ◽  
Extended State ◽  
Tracking Differentiator ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Spatial Trajectory

In this paper, to address the spatial trajectory tracking problem of unmanned airships, a robust controller based on active disturbance rejection control is presented. By transforming the airship model to a standardized form, a straightforward design approach is adopted for the design of the controller. Active disturbance rejection control is composed of a tracking differentiator, an extended state observer, and a nonlinear state error feedback. The proposed controller replaces the conventional tracking differentiator with a third-order differentiator. The new tracking differentiator provides higher tracking precision and smoother transient process. The external disturbances and model uncertainties are observed by the extended state observer and compensated in the controller design, subsequently. Comparisons with technologies frequently used in the trajectory tracking are made through numerical simulation. The comparisons validate that the proposed controller provides satisfying performance and robustness in the presence of model uncertainty and external disturbance.

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