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Appl. Sci. 2018, 8(9), 1571; https://doi.org/10.3390/app8091571

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

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and
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1
Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
Yanqihu Campus, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 1 August 2018 / Revised: 27 August 2018 / Accepted: 3 September 2018 / Published: 6 September 2018
(This article belongs to the Special Issue Light Communication: Latest Advances and Prospects)
Full-Text   |   PDF [3371 KB, uploaded 6 September 2018]   |  

Abstract

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. View Full-Text
Keywords: MEMS accelerometer; integral saturation; modified disturbance observer; disturbance suppression; drift rejection MEMS accelerometer; integral saturation; modified disturbance observer; disturbance suppression; drift rejection
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Deng, J.; Ren, W.; Zhang, H.; Luo, Y.; Zhou, X.; Mao, Y. A Modified Disturbance Observer Structure Based on Acceleration Measurement for Disturbance Suppression in Tracking Control System. Appl. Sci. 2018, 8, 1571.

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