Modal analysis of an isolated nonlinear response mode using the Nyquist circle properties: Numerical case

D. Di Maio*

*Corresponding author for this work

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

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Abstract

Modal testing practitioners are well accustomed to FRFs which, nowadays, can be measured and analysed by a large variety of methods and tools. However, most of the tools for linear modal analysis are practically unusable when the frequency response is amplitude dependent. Hence, the methods based on the properties of the Nyquist circle become unavailable because of the loss of its circularity and completeness. Nevertheless, FRFs of well-isolated modes can still be processed by calculating the modal parameters for every pair of receptance points taken at equal amplitude either side the maximum response peak. The major limitation of this method is the absence of one branch of the response function due to unstable dynamics. The objective of this work is to show that incomplete FRF functions can be still processed to obtain the modal parameters. The method is benchmarked against a single degree of freedom both for linear and nonlinear response conditions.

Original languageEnglish
Title of host publicationProceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics
EditorsD. Moens, W. Desmet, B. Pluymers, W. Rottiers
Place of PublicationLeuven
PublisherKatholieke Universiteit Leuven
Pages2661-2672
Number of pages12
ISBN (Electronic)9789073802995
Publication statusPublished - 2018
Event2018 International Conference on Noise and Vibration Engineering, ISMA 2018 - Campus Social Sciences, Leuven, Belgium
Duration: 17 Sep 201819 Sep 2018
Conference number: 28

Conference

Conference2018 International Conference on Noise and Vibration Engineering, ISMA 2018
Abbreviated titleISMA 2018
CountryBelgium
CityLeuven
Period17/09/1819/09/18

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