An Improved Equivalent-Input-Disturbance Approach for Repetitive Control System With State Delay and Disturbance

2018 ◽  
Vol 65 (1) ◽  
pp. 521-531 ◽  
Author(s):  
Pan Yu ◽  
Min Wu ◽  
Jinhua She ◽  
Kang-Zhi Liu ◽  
Yosuke Nakanishi
Keyword(s):  
Control System ◽  
Repetitive Control ◽  
State Delay ◽  
Input Disturbance ◽  
Equivalent Input Disturbance

Active Structural Control Based on Integration ofΗ∞Control and Equivalent-Input-Disturbance Approach

2016 ◽  
Vol 20 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Mingxing Fang ◽  
◽  
Lijun Wu ◽  
Jing Cheng ◽  
Youwu Du ◽  
...  
Keyword(s):  
Control System ◽  
Structural Control ◽  
Control Structure ◽  
Vibration Signal ◽  
Control Input ◽  
Building Structures ◽  
System Configuration ◽  
Input Disturbance ◽  
Active Structural Control ◽  
Equivalent Input Disturbance

This paper describes an approach for suppressing earthquake-induced vibrations of building structures. The design of the control system is based on the equivalent-input-disturbance approach for improving the vibration rejection performance. A control system configuration with a vibration estimator is described, and a method of designing such a control system that employsΗ∞control is presented. The vibration rejection performance is guaranteed by the control structure, in which an equivalent vibration signal on the control input channel is estimated and directly incorporated into the control input. The validity of our method is demonstrated through simulations.

Compensation for Input Nonlinearities in Repetitive Control Systems Based on Improved Equivalent-Input-Disturbance Approach

2016 ◽  
Vol 20 (1) ◽  
pp. 146-154 ◽  
Author(s):  
Wenjing Cai ◽  
◽  
Min Wu ◽  
Jinhua She ◽  
Luefeng Chen ◽  
...  
Keyword(s):  
Control Systems ◽  
Prior Information ◽  
Repetitive Control ◽  
Control Law ◽  
Extended State ◽  
Input Disturbance ◽  
Actuator Nonlinearities ◽  
Equivalent Input Disturbance ◽  
Reference Input ◽  
Tracking Period

The equivalent-input-disturbance (EID) approach is used to deal with the problem of tracking period signals for a plant with input actuator nonlinearities in a repetitive control system. First, an EID estimator is constructed by taking the full advantage of an extended state observer (ESO), the design of the ESO is explained. Next, an EID estimate, which represents the synthetic effect of the nonlinearities, is incorporated into a repetitive control law to compensate for the effect caused by the nonlinearities. This method does not require any prior information about the nonlinearities. It guarantees perfect tracking for periodic reference input and satisfactory compensation for input nonlinearities at the same time. Finally, simulation and experimental results show the effectiveness of the method.

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