Direct Closed-Loop Identification of Mechanical Resonances Above the Nyquist Frequency Without Any External Persistently Exciting Signals

Direct Closed-Loop Identification of Mechanical Resonances Above the Nyquist Frequency Without Any External Persistently Exciting Signals
Title:
Direct Closed-Loop Identification of Mechanical Resonances Above the Nyquist Frequency Without Any External Persistently Exciting Signals
Other Titles:
IECON 2014 – 40th Annual Conference of IEEE Industrial Electronics Society
Keywords:
Publication Date:
29 October 2014
Citation:
W. Yan, C. Du and C. K. Pang, "Direct closed-loop identification of mechanical resonances above the nyquist frequency without any external persistently exciting signals," IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, Dallas, TX, 2014, pp. 2750-2755.
Abstract:
In this paper, a general multirate approach is proposed for direct closed-loop identification of mechanical resonances above the Nyquist frequency without injecting any external persistently exciting (PE) signals. Based on the polynomial transformation technique, an extended least-squares (ELS) algorithm is designed to estimate parameters of the mixed-rate model, from which parameters of the fast-rate model is extracted. Convergence properties of the ELS algorithm are analyzed, and the parameter identifiability is ensured if the plant output sampling rate is non-integer multiples of the controller sampling rate. The performance of the proposed approach is evaluated by simulation results on the head-positioning servo control system of a hard disk drive (HDD) during track-following mode, where no external PE signal is added on.
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PublisherCopyrights
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Description:
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ISSN:
1553-572X
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