Damping Estimation of Friction Systems in Random Vibrations

Tobias Friis, Evangelos Katsanos, Sandro Amador, Rune Brincker

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


    Friction is one of the most efficient and economical mechanisms to reduce vibrations in structural mechanics. However, the estimation of the equivalent linear damping of the friction damped systems in experimental modal analysis and operational modal analysis can be adversely affected by several assumptions regarding the definition of the linear damping and the identification methods or may be lacking a meaningful interpretation of the damping. Along these lines, this project focuses on assessing the potential to estimate efficiently the equivalent linear damping of friction systems in random vibrations with the use of one novel method and two existing ones, modified, though, appropriately. Results of numerical simulations using the three procedures enabled their preliminary comparative assessment in terms of the related damping estimation potential. Indications from the current study showed that two of the methods estimate efficiently the equivalent linear damping, however, the equivalent linear damping seems to depend on the definition of the equivalence. Nonetheless, it seems that the variation of the equivalent linear damping estimates based on the three aforementioned methods becomes less significant when compared to their actual influence on the linear response.
    Original languageEnglish
    Title of host publicationNonlinear Dynamics, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series.
    Publication date2018
    ISBN (Print)978-3-319-74279-3
    ISBN (Electronic)978-3-319-74280-9
    Publication statusPublished - 2018
    Event36th International Modal Analysis Conference - Orlando, United States
    Duration: 12 Feb 201815 Feb 2018
    Conference number: 36


    Conference36th International Modal Analysis Conference
    Country/TerritoryUnited States


    • Friction damping
    • Random vibrations
    • Equivalent linear damping
    • Nonlinear simulations
    • modal decomposition


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