A general multirate approach for direct closed-loop identification to the Nyquist frequency and beyond
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[1] National University of Singapore
National University of Singapore
Singapur
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[2] Data Storage Institute
Data Storage Institute
Singapur
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- Localización: Automatica: A journal of IFAC the International Federation of Automatic Control, ISSN 0005-1098, Vol. 53, 2015, págs. 164-170
- Idioma: inglés
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Resumen
- español
- English
Without injecting any external persistently exciting signals, a general multirate approach is proposed for direct closed-loop identification. First, an extended least-squares algorithm is designed to identify the mixed-rate model after polynomial transformation. Next, the identified mixed-rate model is used to compute the fast-rate model, from which system dynamics to the Nyquist frequency and beyond can be obtained. Identifiability is mathematically proven if the plant output sampling rate is non-integer multiples of the controller sampling rate. The effectiveness of the proposed approach is evaluated by both the simulation and experimental results in a hard disk drive
