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Numerical and Experimental Investigation of a New Nonlinear Energy Sink for Passive Shock Mitigation

[+] Author Affiliations
Mohammad A. AL-Shudeifat, Nicholas Wierschem, Alexander F. Vakakis, Lawrence A. Bergman, Billie F. Spencer, Jr.

University of Illinois at Urbana-Champaign, Urbana, IL

Paper No. DETC2012-70453, pp. 1161-1164; 4 pages
doi:10.1115/DETC2012-70453
From:
  • ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 24th Conference on Mechanical Vibration and Noise, Parts A and B
  • Chicago, Illinois, USA, August 12–15, 2012
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-4500-4
  • Copyright © 2012 by ASME

abstract

A new device functioning as an efficient nonlinear energy sink (NES) is explored here. The device consists of a mass coupled to a two-story linear test structure through a single-sided vibro-impact (VI) nonlinearity in one direction and a weak linear spring in both directions. This design is found to be more efficient for passive targeted energy transfer (TET) than existing NESs. It absorbs and rapidly dissipates a significant amount of the impulsive energy induced in the linear structure. In addition, some of this initial energy is pumped to higher modes of the structure and efficiently dissipated there. The numerical results have verified that the proposed single-sided VI NES maintains high level of performance over a broad range of high input energies. It performs near to its optimum even for severe induced shocks. Moreover, the numerical results have been experimentally verified; good agreement between numerical predictions and experimental findings was observed.

Copyright © 2012 by ASME

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