Identification of a non-linear electromagnetic system: An experimental study

S. C. Chang, P. C. Tung

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This paper is concerned with the technique of identifying a non-linear electromagnetic system experimentally based on the principle of harmonic balance and the curve fitting method. The system under investigation is a symmetric rotor suspended by a spring device and excited by an electromagnet of a magnetic bearing. Particular emphases are placed on the identifiability of such a technique for this system and how to improve the modelling accuracy. The traditional identification technique is modified in order to successfully identify this system possessing highly non-linear characteristics. The resulting non-linear model has been proven to be in agreement with the experimental data. The knowledge gained from these studies are presented and discussed thoroughly.

Original languageEnglish
Pages (from-to)853-871
Number of pages19
JournalJournal of Sound and Vibration
Issue number5
StatePublished - 30 Jul 1998


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