Abstract
Experimental data clearly show a strong and nonlinear dependence of damping from the maximum vibration amplitude reached in a cycle for macro- and microstructural elements. This dependence takes a completely different level with respect to the frequency shift of resonances due to nonlinearity, which is commonly of 10–25% at most for shells, plates and beams. The experiments show that a damping value over six times larger than the linear one must be expected for vibration of thin plates when the vibration amplitude is about twice the thickness. This is a huge change! The present study derives accurately, for the first time, the nonlinear damping from a fractional viscoelastic standard solid model by introducing geometric nonlinearity in it. The damping model obtained is nonlinear, and its frequency dependence can be tuned by the fractional derivative to match the material behaviour. The solution is obtained for a nonlinear single-degree-of-freedom system by harmonic balance. Numerical results are compared to experimental forced vibration responses measured for large-amplitude vibrations of a rectangular plate (hardening system), a circular cylindrical panel (softening system) and a clamped rod made of zirconium alloy (weak hardening system). Sets of experiments have been obtained at different harmonic excitation forces. Experimental results present a very large damping increase with the peak vibration amplitude, and the model is capable of reproducing them with very good accuracy.
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Acknowledgements
The author acknowledges the financial support of the NSERC Discovery Grant and the Canada Research Chair Program. The present research was partially supported by the Qatar grant NPRP 7-032-2-016. Some graduate students and postdoctoral fellows helped with some experimental measurements and experimental set-up: Dr. Giovanni Ferrari, Dr. Silvia Carra, Mr. Prabakaran Balasubramanian, Mr. Carlo Augenti and Mr. Lorenzo Piccagli.
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Amabili, M. Nonlinear damping in large-amplitude vibrations: modelling and experiments. Nonlinear Dyn 93, 5–18 (2018). https://doi.org/10.1007/s11071-017-3889-z
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DOI: https://doi.org/10.1007/s11071-017-3889-z