Measurement and identification of the nonlinear dynamics of a jointed structure using full-field data; Part II- Nonlinear system identification
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Accepted version
Accepted version
Author(s)
Type
Journal Article
Abstract
The dynamic responses of assembled structures are greatly affected by the mechanical joints, which are often the cause of nonlinear behavior. To better understand and, in the future, tailor the nonlinearities, accurate methods are needed to characterize the dynamic properties of jointed structures. In this paper, the nonlinear characteristics of a jointed beam is studied with the help of multiple identification methods, including the Hilbert Transform method, Peak Finding and Fitting method, Dynamic Mode Decomposition method, State-Space Spectral Submanifold, and Wavelet-Bounded Empirical Mode Decomposition method. The nonlinearities are identified by the responses that are measured via accelerometers in a series of experiments that consist of hammer testing, shaker ringdown testing, and response/force-control stepped sine testing. In addition to accelerometers, two high-speed cameras are used to capture the motion of the whole structure during the shaker ringdown testing. Digital Image Correlation (DIC) is then adopted to obtain the displacement responses and used to determine the mode shapes of the jointed beam. The accuracy of the DIC data is validated by the comparison between the identification results of acceleration and displacement signals. As enabled by full-field data, the energy-dependent characteristics of the structure are also presented. The setup of the different experiments is described in detail in Part I (Chen et al., 2021) of this research. The focus of this paper is to compare nonlinear system identification methods applied to different measurement techniques and to exploit the use of high spatial resolution data.
Date Issued
2021-09-16
Date Acceptance
2021-08-25
Citation
Mechanical Systems and Signal Processing, 2021, 166, pp.1-20
ISSN
0888-3270
Publisher
Elsevier
Start Page
1
End Page
20
Journal / Book Title
Mechanical Systems and Signal Processing
Volume
166
Copyright Statement
© 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000704761800010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Engineering, Mechanical
Engineering
Jointed structures
Nonlinear system identification
Digital Image Correlation (DIC)
Amplitude-dependent characteristics
Energy-dependent characteristics
EMPIRICAL MODE DECOMPOSITION
SPECTRAL SUBMANIFOLDS
HILBERT TRANSFORM
BACKBONE CURVES
COMPUTATION
VIBRATION
IMPACT
Publication Status
Published
Article Number
ARTN 108402
Date Publish Online
2021-09-16