A Modified Disturbance Observer Structure Based on Acceleration Measurement for Disturbance Suppression in Tracking Control System

The micro-electro-mechanical system (MEMS) accelerometer is widely adopted in many engineering control systems due to its extraordinary performance with high bandwidth, small size and low weight. However, massive drift caused by its insensitively at low frequency is the main factor which limits its...

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Bibliographic Details
Published in:Applied sciences 2018-09, Vol.8 (9), p.1571
Main Authors: Deng, Jiuqiang, Ren, Wei, Zhang, Hanwen, Luo, Yong, Zhou, Xi, Mao, Yao
Format: Article
Language:English
Subjects:
Acceleration measurement
Accelerometers
Control systems design
Control theory
Controllers
Disturbance
Disturbance observers
disturbance suppression
drift rejection
Feedforward control
Hard disks
integral saturation
International conferences
MEMS accelerometer
Microelectromechanical systems
modified disturbance observer
Robots
Saturation
Sensors
System identification
Telescopes
Transfer functions
Velocity
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Summary:The micro-electro-mechanical system (MEMS) accelerometer is widely adopted in many engineering control systems due to its extraordinary performance with high bandwidth, small size and low weight. However, massive drift caused by its insensitively at low frequency is the main factor which limits its performance. It leads to integral saturation when the feedforward method is used and hinders the improvement of disturbance suppression ability at low frequency, which is a significant factor for evaluating the closed-loop performance of a high-precision tracking system. To solve this problem, a modified disturbance observer structure and its corresponding new controller, which can improve disturbance suppression performance at low frequency by effectively rejecting more drift and weakening the occurrence possibility of integral saturation when drift exists, are proposed. Detailed analyses and a series of comparative experimental results verify that the proposed method can effectively enhance disturbance suppression performance at low frequency.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8091571