Article (Scientific journals)
Bayesian model updating and class selection of a wing-engine structure with nonlinear connections using nonlinear normal modes
Song, M.; Renson, L.; Moaveni, B. et al.
2022In Mechanical Systems and Signal Processing, 165
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Keywords :
Bayesian inference; Control-based continuation; Model class selection; Nonlinear model updating; Nonlinear normal modes; Nonlinear system identification; Uncertainty quantification and propagation; Elastic moduli; Engines; Inference engines; Nonlinear systems; Uncertainty analysis; Bayesian model updating; Class selections; Engine structure; Nonlinear systems identification; Bayesian networks
Abstract :
[en] This paper presents a Bayesian model updating and model class selection approach based on nonlinear normal modes (NNMs). The performance of the proposed approach is demonstrated on a conceptually simple wing-engine structure. Control-based continuation is exploited to measure experimentally the NNMs of the structure by tracking the phase quadrature condition between the structural response and single input excitation. A two-phase Bayesian model updating framework is implemented to estimate the joint posterior distribution of unknown model parameters: (1) at phase I, the effective Young's modulus of a detailed linear finite element model and its estimation uncertainty are inferred from the data; (2) at phase II, a reduced-order model is obtained from the updated linear model using Craig-Bampton method, and coefficient parameters of structural nonlinearities are updated using the measured NNMs. Five different model classes representing different nonlinear functions are investigated, and their Bayesian evidence are compared to reveal the most plausible model. The obtained model is used to predict NNMs by propagating uncertainties of parameters and error function. Good agreement is observed between model-predicted and experimentally identified NNMs, which verifies the effectiveness of the proposed approach for nonlinear model updating and model class selection. © 2021 Elsevier Ltd
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Song, M.;  Dept. of Civil and Environmental Engineering, Tufts University, Medford, MA, United States
Renson, L.;  Dept. of Mechanical Engineering, Imperial College London, London, UK, United Kingdom
Moaveni, B.;  Dept. of Civil and Environmental Engineering, Tufts University, Medford, MA, United States
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Bayesian model updating and class selection of a wing-engine structure with nonlinear connections using nonlinear normal modes
Publication date :
2022
Journal title :
Mechanical Systems and Signal Processing
ISSN :
0888-3270
eISSN :
1096-1216
Publisher :
Academic Press
Volume :
165
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
The authors acknowledge partial support of this study by the National Science Foundation Grant number 1903972. L. Renson acknowledges the financial support of the Royal Academy of Engineering, Research Fellowship #RF1516/15/11. The opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily represent the views of the sponsors and organizations involved in this project.
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since 30 October 2022

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