Use of the dynamic stiffness method to interpret experimental data from a nonlinear system

Autor(es)

Tang, Bin ^{[1, 2]} ; Brennan, M. J. ^[3] ; Gatti, G. ^[4]

Afiliação do(s) autor(es)

^[1] Dalian Univ Technol, Inst Internal Combust Engine, Dalian 116023 - Peoples R China

^[2] Dalian Univ Technol, Key Lab Ocean Energy Utilizat & Energy Conservat, Minist Educ, Dalian 116023 - Peoples R China

^[3] Univ Estadual Paulista UNESP, Dept Engn Mecan, BR-15385000 Ilha Solteira, SP - Brazil

^[4] Univ Calabria, Dept Mech Energy & Managment Engn, I-87036 Arcavacata Di Rende, CS - Italy

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sound and Vibration; v. 421, p. 91-110, MAY 12 2018.
• Citações Web of Science: 0

Resumo

The interpretation of experimental data from nonlinear structures is challenging, primarily because of dependency on types and levels of excitation, and coupling issues with test equipment. In this paper, the use of the dynamic stiffness method, which is commonly used in the analysis of linear systems, is used to interpret the data from a vibration test of a controllable compressed beam structure coupled to a test shaker. For a single mode of the system, this method facilitates the separation of mass, stiffness and damping effects, including nonlinear stiffness effects. It also allows the separation of the dynamics of the shaker from the structure under test. The approach needs to be used with care, and is only suitable if the nonlinear system has a response that is predominantly at the excitation frequency. For the structure under test, the raw experimental data revealed little about the underlying causes of the dynamic behaviour. However, the dynamic stiffness approach allowed the effects due to the nonlinear stiffness to be easily determined. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/23522-2 - Investigação sobre a interação entre o shaker e uma estrutura não-linear
• Beneficiário: Michael John Brennan
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional