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Abstract
The process of characterizing a nonlinearity can be defined as determining three things; location, type, and functional form. In the present study it is investigated if the random decrement technique can be used in an output-only setting for one of these; localizing nonlinear behavior. The localization is performed through a novel random decrement analysis procedure of the time history of each response measurement in a multiple degrees-of-freedom system. The analysis will detect nonlinear behavior, if present, and indicate the degree of the nonlinear behavior. A numerical test case is investigated using the analysis procedure, where a localized nonlinear element is located at various discrete locations of a T-shaped structure. Two types of nonlinearities, and three locations are investigated. Results indicate that it is not possible to explicitly determine at which degree-of-freedom a nonlinear element resides. It is, however, possible to determine which degrees-offreedom that are affected by the nonlinear element.
Original language | English |
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Title of host publication | Proceedings of ISMA2020 |
Editors | W. Desmet, B. Pluymers, D. Moens, S. Vandemaele |
Publication date | 2020 |
Pages | 2231-2238 |
ISBN (Electronic) | 9789082893113 |
Publication status | Published - 2020 |
Event | International Conference on Noise and Vibration Engineering - Duration: 7. Sept 2020 → 9. Sept 2020 Conference number: 29 |
Conference
Conference | International Conference on Noise and Vibration Engineering |
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Number | 29 |
Period | 07/09/2020 → 09/09/2020 |
Keywords
- Random vibration
- Nonlinear system identification
- Localization of nonlinearity
- Random decrement
- NORD
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Localizing nonlinear behavior from response measurements
Karsten Krautwald Vesterholm (Speaker)
7. Sept 2020 → 9. Sept 2020Activity: Talks and presentations › Conference presentations