单边碰振轨道非线性能量阱减震性能及碰撞参数研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 64-70.

论文

王菁菁1，浩文明2，吕西林3

作者信息 +

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

WANG Jingjing1,HAO Wenming2,L Xilin3

Author information +

文章历史 +

摘要

轨道非线性能量阱（Track Nonlinear Energy Sink，简称轨道NES）是一种被动结构控制装置，其通过附加质量块沿竖直平面内的轨道运动产生非线性回复力，从而降低主体结构响应。文中研究的单边碰振轨道非线性能量阱（Single-sided Vibro-impact Track Nonlinear Energy Sink，简称SSVI轨道NES）在原轨道NES中加设制动装置，通过碰撞限制质量块单方向的运动，使对称连续的轨道变得单边不连续。SSVI轨道NES较轨道NES非线性更强，展现出更优越的抗冲击性能。对一两自由度主体结构附加SSVI轨道NES进行了理论分析、数值优化和试验验证，优化后的SSVI轨道NES在脉冲荷载作用下具备良好的抗冲击性能，但地震作用下的模拟结果显示其减震性能仍有待改进。为此，对SSVI轨道NES碰撞恢复系数和制动器位置进行了二次优化和分析，结果表明：通过调整SSVI轨道NES碰撞恢复系数和制动器位置可明显改善其减震性能；地震特性将影响控制装置参数的取值，可针对不同特性的地震选择相应设计参数。

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.

导出引用

王菁菁1，浩文明2，吕西林3. 单边碰振轨道非线性能量阱减震性能及碰撞参数研究[J]. 振动与冲击, 2019, 38(16): 64-70

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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