Abstract
The present paper deals with the dynamics of a two-degrees-of freedom system consisting of a nonlinear absorber attached to a primary linear structure under external excitations. The nonlinear attachment exhibits a hysteretic restoring force modeled with the classic Bouc–Wen law [hysteretic vibration absorber (HVA)]; furthermore, the mechanical characteristics of the nonlinear oscillator are tuned to regulate the ratio between the two natural frequencies and to lead the system near to internal resonance conditions. The steady-state periodic solutions are investigated, and particular attention is given to the study of modal interactions by means of frequency response curves for various excitation levels. A parametric investigation is performed to analytically detect the conditions for the occurrence of (n : 1) internal resonances for low and high external excitations. Finally, specific resonance conditions have been found under which the nonlinear attachment produces a notable reduction of the vibration amplitude of the primary system for a wide range of the excitation level. The aim of the paper is therefore twofold: the first purpose is to investigate the effect of the hysteretic dam** on the passive mitigation of structural vibrations. The second purpose is to improve the system capacity of mitigating structural vibrations, by optimally choosing the characteristics of the HVA.
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Acknowledgements
This work has been partially supported by the MIUR (Ministry of Education, University and Research) under the grant PRIN-2015, 2015TTJN95, P.I. Fabrizio Vestroni, “Identification and Monitoring of Complex Structural Systems”.
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Vestroni, F., Casini, P. Mitigation of structural vibrations by hysteretic oscillators in internal resonance. Nonlinear Dyn 99, 505–518 (2020). https://doi.org/10.1007/s11071-019-05129-9
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DOI: https://doi.org/10.1007/s11071-019-05129-9