1. Online Identification of a Mechanical System in Frequency Domain Using Sliding DFT.
- Author
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Nevaranta, Niko, Derammelaere, Stijn, Parkkinen, Jukka, Vervisch, Bram, Lindh, Tuomo, Stockman, Kurt, Niemela, Markku, Pyrhonen, Olli, and Pyrhonen, Juha
- Subjects
DISCRETE Fourier transforms ,SYSTEM identification ,SERVOMECHANISMS ,CLOSED loop systems ,TIME-domain analysis - Abstract
A proper real-time system identification method is of great importance in order to acquire an analytical model that sufficiently represents the characteristics of the monitored system. While the use of different time-domain online identification techniques has been widely recognized as a powerful approach to system diagnostics, the frequency-domain identification techniques have primarily been considered for offline commissioning purposes. This paper addresses issues in the online frequency-domain identification of a mechanical system with varying dynamics; particular attention is paid to detect the changes in the system dynamics. A closed-loop online identification method is presented that is based on a sliding discrete Fourier transform at a selected set of frequencies. The method is experimentally validated by a closed-loop controlled servomechanism with a limited stroke and time-varying parameters. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
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