Article (Scientific journals)
Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement
Liu, Q.; Hou, Z.; Zhang, Y. et al.
2022In Journal of Vibration and Acoustics, 144 (3)
Peer reviewed
 

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Keywords :
bistable structure; displacement-measurement restoring force surface; quasi-zero stiffness; Strongly nonlinear structures; tristable structure; Cyclic loads; Energy harvesting; Geometry; Parameter estimation; Stiffness; Uncertainty analysis; Bistable structures; Displacement-measurement restoring force surface; Displacements measurements; Nonlinear restoring force; Nonlinear structure; Quasi-zero stiffness; Restoring force surfaces; Strongly nonlinear; Strongly nonlinear structure; Tristable structure; Displacement measurement
Abstract :
[en] Strongly nonlinear structures have attracted a great deal of attention in energy harvesting and vibration isolation recently. However, it is challenging to accurately characterize the nonlinear restoring force using analytical modeling or cyclic loading tests in many realistic conditions due to the uncertainty of installation parameters or other constraints, including space size and dynamic disturbance. Therefore, a displacement-measurement restoring force surface identification approach is presented for obtaining the nonlinear restoring force. Widely known quasi-zero stiffness, bistable, and tristable structures are designed in a cantilever-beam system with coupled rotatable magnets to illustrate the strongly nonlinear properties in the application of energy harvesting and vibration isolation. Based on the derived physical model of the designed strongly nonlinear structures, the displacement-measurement restoring force surface identification with a least-squares parameter fitting is proposed to obtain the parameters of the nonlinear restoring force. The comparison between the acceleration integration and displacement differentiation methods for describing the restoring force surface of strongly nonlinear structures is discussed. Besides, the influence of the noise level on identification accuracy is investigated. In experimental conditions, quasi-zero stiffness, bistable, and tristable nonlinear structures with various geometrical parameters are utilized to analyze the identified nonlinear restoring force curve and measured force-displacement trajectory. Finally, experimental results verify the effectiveness of the displacement-measurement restoring force surface method to obtain the nonlinear restoring force. © 2021 by ASME.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Liu, Q.;  Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049, China
Hou, Z.;  Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049, China
Zhang, Y.;  Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049, China
Jing, X.;  Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, Hong Kong
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Cao, J.;  Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049, China
Language :
English
Title :
Nonlinear Restoring Force Identification of Strongly Nonlinear Structures by Displacement Measurement
Publication date :
2022
Journal title :
Journal of Vibration and Acoustics
ISSN :
1048-9002
eISSN :
1528-8927
Publisher :
American Society of Mechanical Engineers (ASME)
Volume :
144
Issue :
3
Peer reviewed :
Peer reviewed
Funding text :
National Natural Science Foundation of China (Grant No. 51975453; Funder ID: 10.13039/501100001809).
Available on ORBi :
since 30 October 2022

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