A Systematic Approach to Modal Testing of Nonlinear Structures

A. Delli Carri, D. J. Ewins

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

7 Citations (Scopus)

Abstract

The application of experimental modal analysis methods to nonlinear structures (sometimes referred to as "nonlinear modal testing" - NLMT) is not a new field, but only in the past few years has it become mature enough to be approached in a systematic way. Many methods have been developed over the years for dealing with nonlinearities in structural dynamics, but nonlinearity is an extremely complex phenomenon with so many aspects and consequences that is not possible to have a single method capable to deal with all of them. Rather than taking a holistic approach, it is perhaps useful for the engineer to have a set of mathematical tools to analyse separate subsets of the whole problem, i.e. one being within the scope of each individual investigation. The main objective of this paper is to provide a modular framework from which the engineer can choose the most appropriate method to retrieve information about an examined nonlinearity, based on the type of information needed and the available data set. This is achieved by performing a breakdown of the nonlinear modal analysis process into four main stages: detection, localisation, characterisation and quantification - each of these providing a different level of insight into the problem. A review of currently-available algorithms applicable for these four categories is presented, as well as their application to two simple case studies.

Original languageEnglish
Title of host publicationTopics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
Pages273-286
Number of pages14
Volume45
Edition7
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event31st International Modal Analysis Conference on Structural Dynamics, IMAC 2013 - Garden Grove, United States
Duration: 11 Feb 201314 Feb 2013

Conference

Conference31st International Modal Analysis Conference on Structural Dynamics, IMAC 2013
CountryUnited States
CityGarden Grove
Period11/02/1314/02/13

Keywords

  • Nonlinear characterisation
  • Nonlinear localisation
  • Nonlinear modal testing
  • Reverse path
  • Review

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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  • Cite this

    Carri, A. D., & Ewins, D. J. (2014). A Systematic Approach to Modal Testing of Nonlinear Structures. In Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013 (7 ed., Vol. 45, pp. 273-286) https://doi.org/10.1007/978-1-4614-6585-0_25