Abstract
All real structures are inherently nonlinear. Whether a structure exhibits linear or nonlinear behavior, depends
mainly on the excitation level. So far no unequivocal framework for experimental detection, localization, and
characterization of structural nonlinearities from dynamic measurements exists. The present study suggests
a framework for the detection of structural nonlinearities. Two methods for detection are compared, the
homogeneity method and a Hilbert transform based method. Based on these two methods, a nonlinearity
index is suggested. Through simulations and laboratory experiments it is demonstrated, for a simple but
representative nonlinear structure, that both detection methods are able to detect even weak nonlinearities,
and that the nonlinearity index provides a sensitive and robust measure of nonlinearity. For a range of input
force amplitudes, it is shown that it is possible to estimate a systems linear and nonlinear regimes in terms of
input amplitude, and asses the strength of the nonlinearity.
Original language | English |
---|---|
Title of host publication | Proceedings of ISMA2010-USD2010 |
Publication date | 2010 |
Publication status | Published - 2010 |
Event | ISMA2010 : International conference on Noise and Vibration Engineering - Leuven, Belgium Duration: 1 Jan 2010 → … |
Conference
Conference | ISMA2010 : International conference on Noise and Vibration Engineering |
---|---|
City | Leuven, Belgium |
Period | 01/01/2010 → … |