Fractional disturbance observer for vibration suppression of a beam-cart system

2014 ◽  
Author(s):  
Ines Tejado ◽  
Blas M. Vinagre ◽  
Daniel Torres ◽  
Emiliano Perez
Keyword(s):  
Disturbance Observer ◽  
Vibration Suppression

Vibration suppression of magnetic bearing based on sliding mode disturbance observer

2012 ◽  
Vol 20 (3) ◽  
pp. 563-570 ◽  
Author(s):  
韩邦成 HAN Bang-cheng ◽  
崔华 CUI Hua ◽  
汤恩琼 TANG En-qiong
Keyword(s):  
Disturbance Observer ◽  
Vibration Suppression ◽  
Sliding Mode ◽  
Magnetic Bearing ◽  
Sliding Mode Disturbance Observer

A composite anti-disturbance control scheme for attitude stabilization and vibration suppression of flexible spacecrafts

2015 ◽  
Vol 23 (15) ◽  
pp. 2470-2477 ◽  
Author(s):  
Zhen Wang ◽  
Zhong Wu ◽  
Lijun Li ◽  
Jun Yuan
Keyword(s):  
Attitude Control ◽  
Disturbance Observer ◽  
Vibration Suppression ◽  
Disturbance Attenuation ◽  
Pd Controller ◽  
Parameter Uncertainties ◽  
Performance Simulation ◽  
Attitude Stabilization ◽  
Multiple Disturbances ◽  
Control Scheme

Abstract: There exist multiple disturbances resulting from the structural vibrations of flexible appendages, unknown external and internal disturbances, and parameter uncertainties, which affect the attitude control performance seriously. To enhance the disturbance attenuation performance and vibration suppression ability, a composite anti-disturbance control scheme (CADCS) based on disturbance observer is proposed for attitude stabilization and vibration reduction of flexible spacecraft. The CADCS combines a composite disturbance observer (CDO) and a PD controller with feedforward. The multiple disturbances are equivalent to slowly varying disturbance and harmonic disturbance. The CDO can estimate two types of disturbance and compensate for them through feedforward. The PD controller realizes the asymptotic convergence by compensating the disturbance from CDO. The CADCS based on CDO and PD controller is not only simple and easy to realize, but also yields better vibration suppression and anti-disturbance performance. Simulation results of a certain spacecraft demonstrate the effectiveness of the proposed CADCS.

On Fractional Order Disturbance Observer

2003 ◽  
Author(s):  
YangQuan Chen ◽  
Blas M. Vinagre ◽  
Igor Podlubny
Keyword(s):  
Fractional Order ◽  
Disturbance Observer ◽  
Vibration Suppression ◽  
Patent Application ◽  
Cutoff Frequency ◽  
Relative Degree ◽  
Phase Margin ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

In this paper, for the first time, the fractional order disturbance observer (FO-DOB) is proposed for vibration suppression applications such as hard disk drive servo control. It has been discovered in a recently published US patent application (US20010036026) (Chen et al., 2001) that there is a tradeoff between the the phase margin loss and the strength of the low frequency vibration suppression. Given the required cutoff frequency of the low pass filter, also known as the Q-filter, it turns out that the relative degree of the Q-filter is the major tuning knob for this tradeoff. As a motivation for the fractional order Q-filter, a solution based on integer order Q-filter with a variable relative degree is introduced which is the key contribution of US20010036026. Then, a fractional order disturbance observer based on the fractional order Q-filter is proposed. The implementation issue is also discussed. The nice point of this paper is that the traditional DOB is extended to fractional order DOB with the advantage that the FO-DOB design is now no longer conservative or aggressive, i.e., given the cutoff frequency and the desired phase margin, we can uniquely determine the fractional order of the low pass filter.

scholarly journals Vibration Suppression Control Using Resonance Frequency Damping Disturbance Observer for Robot Servo System

2021 ◽  
Vol 10 (1) ◽  
pp. 36-44
Author(s):  
Akinori Yabuki ◽  
Kiyoshi Ohishi ◽  
Toshimasa Miyazaki ◽  
Yuki Yokokura ◽  
Toshiyuki Kanmachi ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Disturbance Observer ◽  
Vibration Suppression ◽  
Servo System
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