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Title: Identification of Nonlinear Damping for Large-Amplitude Vibrations of Plates and Curved Panels
Authors: Amabili, Marco
Keywords: nonlinear vibrations; damping; experiments
Issue Date: 2016
Publisher: NTU "KhPI"
Citation: Amabili M. Identification of Nonlinear Damping for Large-Amplitude Vibrations of Plates and Curved Panels / M. Amabili // Nonlinear Dynamics–2016 (ND-KhPI2016) : proceedings of 5th International Conference, dedicated to the 90th anniversary of Academician V. L. Rvachev, September 27-30, 2016 = Нелінійна динаміка–2016 : тези доп. 5-ї Міжнар. конф., 27-30 вересня 2016 р. – Kharkov : NTU "KhPI", 2016. – P. 12-15.
Abstract: A nonlinear identification technique is presented to obtain the damping of isotropic and laminated sandwich rectangular plates and curved panels subjected to harmonic excitation as a function of the vibration amplitude. The response of the structures is approximated by (i) reduced-order models with 10 to 100 degrees of freedom and (ii) a single-degree of freedom Duffing oscillator. The method uses experimental frequency-amplitude data and the leastsquares technique to identify parameters and reconstruct frequency-response curves by spanning the excitation frequency in the neighbourhood of the lowest natural frequencies. In order to obtain the experimental data, a sophisticated measuring technique has been used. The results reveal a strongly nonlinear correlation between the damping and the vibration amplitude.
Appears in Collections:Nonlinear Dynamics–2016

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