A method for non-parametric identification of non-linear vibration systems with asymmetric restoring forces from a resonant decay response

V. Ondra*, I. A. Sever, C. W. Schwingshackl

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

4 Citations (Scopus)

Abstract

A method for non-parametric identification of systems with asymmetric non-linear restoring forces is proposed in this paper. The method, named the zero-crossing method for systems with asymmetric restoring forces (ZCA), is an extension of zero-crossing methods and allows identification of backbones, damping curves and restoring elastic and dissipative forces from a resonant decay response. The validity of the proposed method is firstly demonstrated on three simulated resonant decay responses of the systems with off-centre clearance, bilinear and quadratic stiffness. Then, the method is applied to experimental data from a micro-electro-mechanical resonator in order to quantify its non-linear damping and stiffness effects. Throughout the paper the proposed method is also compared with the Hilbert vibration decomposition to demonstrate that the ZCA yields more accurate results with much less effort.

Original languageEnglish
Pages (from-to)239-258
Number of pages20
JournalMechanical Systems and Signal Processing
Volume114
Early online date25 May 2018
DOIs
Publication statusPublished - 1 Jan 2019

Structured keywords

  • Bristol Composites Institute ACCIS

Keywords

  • Asymmetric restoring forces
  • Hilbert vibration decomposition
  • Micro-electro-mechanical system
  • Non-linear system identification
  • Zero-crossing method for asymmetric restoring forces

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