On using a strong high-frequency excitation for parametric identification of nonlinear systems

Abdraouf Abusoua, Mohammed F. Daqaq

Research output: Contribution to journalArticle

Abstract

This paper describes a new parametric method for the development of nonlinear models with parameters identified from an experimental setting. The approach is based on applying a strong nonresonant high-frequency harmonic excitation to the unknown nonlinear system and monitoring its influence on the slow modulation of the system's response. In particular, it is observed that the high-frequency excitation induces a shift in the slowmodulation frequency and a static bias in the mean of the dynamic response. Such changes can be directly related to the amplitude and frequency of the strong excitation offering a unique methodology to identify the unknown nonlinear parameters. The proposed technique is implemented to identify the nonlinear restoring-force coefficients of three experimental systems. Results demonstrate that this technique is capable of identifying the nonlinear parameters with relatively good accuracy.

Original languageEnglish (US)
Article number051012
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume139
Issue number5
DOIs
StatePublished - Oct 2017

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

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