Detection of sources of nonlinearity in multiple bolted joints by use of laser vibrometer

Arnaldo delli Carri, Sante Campanelli, Dario Di Maio*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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The use of non-contact measurement methods for detecting and locating sources of nonlinearities can be potentially a break-through in the nowadays experimental modal analysis. The primary goal is to define more effective test strategies, whereby contact sensors will measure the nonlinear vibration responses at the best location possible. Jointed structures are a typical example where a large number of the joint can pose the question of where what and how to measure the nonlinear response. Upon the identification of one, or more, nonlinear response mode the objective is to determine where is the source of such nonlinear vibration. Nonlinearity can be characterised when its source is well defined and can be adequately tested. This paper will attempt to detect and locate the source of nonlinearity from a multi-beam jointed assembly. The approach will be carried out by using both contact and non-contact measurement methods, the results of which will be compared and evaluated. The operator to detect the source of nonlinearity will be the coherence function applied to random response data.

Original languageEnglish
Title of host publicationRotating Machinery, Optical Methods and Scanning LDV Methods
Subtitle of host publicationroceedings of the 37th IMAC, A Conference and Exposition on Structural Dynamics 2019
EditorsChristopher Niezrecki, Javad Baqersad, Dario Di Maio
Place of PublicationCham
Number of pages13
ISBN (Electronic)978-3-030-12935-4
ISBN (Print)978-3-030-12934-7
Publication statusPublished - 2019
Externally publishedYes
Event37th Conference and Exposition on Structural Dynamics, IMAC 2019 - Orlando, United States
Duration: 28 Jan 201931 Jan 2019
Conference number: 37

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Conference37th Conference and Exposition on Structural Dynamics, IMAC 2019
Abbreviated titleIMAC
Country/TerritoryUnited States


  • Bolted joints
  • Nonlinear vibration testing
  • SLDV


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