Modal Truncation in Experimental Modal Analysis

Marius Tarpø, Michael Vigsø, Rune Brincker

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Some methods in experimental modal analysis rely on a finite set of modes and they neglect the higher modes. However, this approach causes a truncation of the modal decomposition and the modal truncation introduces errors of unknown magnitude. In this paper the effect of modal truncation is investigated on a test specimen in the laboratory. It is found that the system response is dependent of the frequency and the distribution of the load. Modal truncation can introduce significant errors if the set of mode shapes does not efficiently span the spatial distribution of the load.
Original languageEnglish
Title of host publicationTopics in Modal Analysis & Testing, Volume 9 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
EditorsMichael Mains , Brandon J. Dilworth
Number of pages10
PublisherSpringer
Publication date2018
Pages143-152
Chapter15
ISBN (Print)978-3-319-74699-9
ISBN (Electronic)978-3-319-74700-2
DOIs
Publication statusPublished - 2018
Event36th International Modal Analysis Conference - Orlando, United States
Duration: 12 Feb 201815 Feb 2018
Conference number: 36

Conference

Conference36th International Modal Analysis Conference
Number36
Country/TerritoryUnited States
CityOrlando
Period12/02/201815/02/2018
SeriesConference Proceedings of the Society for Experimental Mechanics Series
ISSN2191-5644

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