A parametric study of single-sided vibro-impact track nonlinear energy sink for seismic response reduction

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 64-70.

WANG Jingjing1,HAO Wenming2,L Xilin3

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Abstract

Track nonlinear energy sinks (Track NESs), a type of passive energy dissipation device featuring an auxiliary mass which moves along a specially shaped track, can reduce structural responses with their nonlinear restoring force.By adding an impact surface on one side of the moving direction of the existing track NES, a single-side vibro-impact (SSVI) track NES was proposed in this work.Due to the discontinuous surge of force during the impacts, the SSVI track NES processes even stronger nonlinearity than the track NES, and thus was more effective in reducing the structural response.The SSVI track NES was analytically and numerically optimized and verified by shake table tests when attached to a two degree-of-freedom primary structure.The initially-optimized SSVI track NES performs effectively when subjected to impulse excitations.The performance of the SSVI track NES under seismic excitations can be further improved by a secondary optimization on impact-related parameters.To this end, the coefficient of restitution and the clearance between the impact surface and the NES mass were further investigated.The results show that by simply changing those parameters, the seismic performance is enhanced considerably.

Key words

nonlinear energy sink / seismic control / parametric optimization / numerical simulation / shake table test

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WANG Jingjing1,HAO Wenming2,L Xilin3. A parametric study of single-sided vibro-impact track nonlinear energy sink for seismic response reduction[J]. Journal of Vibration and Shock, 2019, 38(16): 64-70

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