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Nonlinear Dynamics

, Volume 69, Issue 4, pp 1693–1704 | Cite as

Resonance captures and targeted energy transfers in an inertially-coupled rotational nonlinear energy sink

  • G. Sigalov
  • O. V. Gendelman
  • M. A. AL-Shudeifat
  • L. I. Manevitch
  • A. F. Vakakis
  • L. A. Bergman
Original Paper

Abstract

We explore the conservative and dissipative dynamics of a two-degree-of-freedom (2-DoF) system consisting of a linear oscillator and a lightweight nonlinear rotator inertially coupled to it. When the total energy of the system is large enough, the motion of the rotator is, generically, chaotic. Moreover, we show that if the damping of the rotator is sufficiently small and the damping of the linear oscillator is even smaller, then the system passes through a cascade of resonance captures (transient internal resonances) as the total energy gradually decreases. Rather unexpectedly, all these captures have the same principal frequency but correspond to different nonlinear normal modes (NNMs). In each NNM, the rotator is phase-locked into periodic motion with two frequencies. The NNMs differ by the ratio of these frequencies, which is approximately an integer for each NNM. Essentially non-integer ratios lead to incommensurate periods of ‘slow’ and ‘fast’ motions of the rotator and, thus, to its chaotic behavior between successive resonance captures. Furthermore, we show that these cascades of resonance captures lead to targeted energy transfer (TET) from the linear oscillator to the rotator, with the latter serving, in essence, as a nonlinear energy sink (NES). Since the inertially-coupled NES that we consider has no linearized natural frequency, it is capable of engaging in resonance with the linear oscillator over broad frequency and energy ranges. The results presented herein indicate that the proposed rotational NES appears to be a promising design for broadband shock mitigation and vibration energy harvesting.

Keywords

Nonlinear targeted energy transfer Resonance capture Rotator 

Notes

Acknowledgements

This work was funded in part by the (US–Israel) Binational Science Foundation (Grant 2008055), to which the authors express their gratitude.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • G. Sigalov
    • 1
  • O. V. Gendelman
    • 2
  • M. A. AL-Shudeifat
    • 1
  • L. I. Manevitch
    • 3
  • A. F. Vakakis
    • 1
  • L. A. Bergman
    • 1
  1. 1.Department of Mechanical Science and EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Faculty of Mechanical EngineeringTechnion—Israel Institute of TechnologyHaifaIsrael
  3. 3.Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia

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