Localisation, characterisation and identification of localised nonlinearity in structural dynamics using base excitation frequency response functions

J. Taghipour, H. Haddad Khodaparast, M. I. Friswell, H. Jalali, H. Madinei, X. Wang

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

Abstract

Identification of structural nonlinearities has been of great interest over recent decades. In addition, due to high cost and time requirements, it is not practical to have complete experimental measurements. This study is initially focused on the localisation of structural nonlinearities using an approach based on spatially incomplete experimental frequency domain data from a structural vibration test. A cantilever beam with a nonlinear restoring force is considered under stepped-sine base excitation. An updated linear finite element model and the Craig-Bampton reduction method is used to obtain the reduced nonlinear forces (RNFs) in the measured region, leading to the location decision for nonlinear elements. Then, the Equivalent Dynamic Stiffness Mapping technique is used for characterization and mathematical modelling of the unknown nonlinearities. This technique utilizes the ratio of internal forces and the displacement response of the unknown elements (F/X) in the frequency domain as the Equivalent Dynamic Stiffness.

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
PublisherKU Leuven - Departement Werktuigkunde
Pages2127-2138
Number of pages12
ISBN (Electronic)9789073802995
Publication statusPublished - 1 Jan 2018
Externally publishedYes
Event28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018 - Leuven, Belgium
Duration: 17 Sep 201819 Sep 2018

Publication series

NameProceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics

Conference

Conference28th International Conference on Noise and Vibration Engineering, ISMA 2018 and 7th International Conference on Uncertainty in Structural Dynamics, USD 2018
CountryBelgium
CityLeuven
Period17/09/1819/09/18

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