An on-site modal testing method for the detection of structural non-linearities Part I: Development

Gun Myung Lee, Martin W. Trethewey

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The work presented in this paper discusses the feasibility of an experimental method to detect non-linear structural behaviour in a practical engineering environment. The method is based on the linear analysis of non-linear systems with increasing amplitude random excitation signals. The analysis of the modal parameters from a linear analysis provides a means to detect when a system is behaving in a non-linear fashion and, under some circumstances, to classify the type of non-linearity present. The basic testing/analysis approach is presented and its characteristics evaluated using data simulating three classical non-linear vibratory systems. The results indicate the method is capable of detecting when these non-linear characteristics become significant to void the use of linear analysis methods. The practical implementation constraints are discussed throughout paper to enable the application of the approach in a more realistic testing environment.

Original languageEnglish (US)
Pages (from-to)29-40
Number of pages12
JournalMechanical Systems and Signal Processing
Issue number1
StatePublished - Jan 1992

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications


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