Output-only damping estimation of friction systems in ambient vibrations

T. Friis, E.I. Katsanos, M. Tarpø, S. Amador, R. Brincker

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

68 Downloads (Pure)

Abstract

Working with dynamics in civil engineering applications, it is experienced that real structures have nonlinear damping. The nonlinearity of the damping can be induced by the hysteresis phenomenon, that occurs due to friction or softening geotechnical boundary conditions. Along these lines, this article focusses on assessing the performance of two output-only methods estimating the linear damping of a friction-induced nonlinearly damped system subjected to random vibrations. In particular, the method that employs auto regressive models and poly-reference, and the poly-reference Least Squares Complex Frequency method are included in the study. The methods are comparatively assessed by comparing their linear damping estimates of friction-induced nonlinear numerical simulations with theoretically derived estimates of equivalent linear damping. It is concluded that the output-only methods underestimate the damping when compared to theoretically derived equivalent linear damping for the present case of Coulomb-type friction-induced nonlinear damping.
Original languageEnglish
Title of host publication Proceedings of the International Conference on Noise and Vibration Engineering — 2018
Publication date2018
ISBN (Electronic)9789073802995
Publication statusPublished - 2018
Event28th International Conference on Noise and Vibration Engineering (ISMA 2018) - Leuven, Belgium
Duration: 17 Sep 201819 Sep 2018
Conference number: 28

Conference

Conference28th International Conference on Noise and Vibration Engineering (ISMA 2018)
Number28
CountryBelgium
CityLeuven
Period17/09/201819/09/2018

Cite this

Friis, T., Katsanos, E. I., Tarpø, M., Amador, S., & Brincker, R. (2018). Output-only damping estimation of friction systems in ambient vibrations. In Proceedings of the International Conference on Noise and Vibration Engineering — 2018