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Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation
International Journal of Non-Linear Mechanics ( IF 2.8 ) Pub Date : 2020-07-24 , DOI: 10.1016/j.ijnonlinmec.2020.103558
Haiqin Li , Cyril Touzé , Adrien Pelat , François Gautier

The Acoustic Black Hole (ABH) effect refers to a special vibration damping technique adapted to thin-walled structures such as beams or plates. It usually consists of a local decrease of the structure thickness profile, associated to a thin viscoelastic coating placed in the area of minimum thickness. It has been shown that such structural design acts as an efficient vibration damper in the high frequency range, but not at low frequencies. This paper investigates how different types of vibration absorbers, linear and nonlinear, added to the primary system can improve the low frequency performance of a beam ABH termination. In particular, the conjugated effects of the Acoustic Black Hole effect and a Tuned Mass Damper (TMD), a Nonlinear Energy Sink (NES), a bi-stable NES (BNES), and a vibro-impact ABH (VI-ABH) are investigated. Forced response to random excitation are computed in the time domain using a modal approach combined with an energy conserving numerical scheme. Frequency indicators are defined to characterize and compare the performance of all solutions. The simulation results clearly show that all the proposed methods are able to damp efficiently the flexural vibrations in a broadband manner. The optimal tuning of each proposed solution is then investigated through a thorough parametric study, showing how to optimize the efficiency of each solution. In particular, TMD and VI-ABH show a slight dependence on vibration amplitude, while the performance of NES and BNES have a peak of efficiency for moderate amplitudes.



中文翻译:

结合非线性减振器和声学黑洞来缓解被动宽带弯曲振动

声学黑洞(ABH)效应是指一种特殊的减振技术,适用于梁或板等薄壁结构。它通常包括结构厚度分布的局部减小,这与放置在最小厚度区域中的薄粘弹性涂层有关。已经表明,这种结构设计在高频范围内起有效的减振器的作用,但在低频范围内不起作用。本文研究了添加到主要系统中的不同类型的线性和非线性减振器如何改善ABH梁端接的低频性能。特别地,声学黑洞效应和调谐质量阻尼器(TMD),非线性能量吸收器(NES),双稳态NES(BNES)和振动冲击ABH(VI-ABH)的共轭效应是调查。使用模态方法结合节能数值方案,可以在时域中计算对随机激励的强制响应。定义频率指示器以表征和比较所有解决方案的性能。仿真结果清楚地表明,所有提出的方法都能够以宽带方式有效地抑制弯曲振动。然后,通过全面的参数研究来研究每个提出的解决方案的最佳调整,以显示如何优化每个解决方案的效率。特别是,TMD和VI-ABH对振动幅度显示出轻微的依赖性,而NES和BNES的性能在中等幅度时具有效率峰值。定义频率指示器以表征和比较所有解决方案的性能。仿真结果清楚地表明,所有提出的方法都能够以宽带方式有效地抑制弯曲振动。然后,通过全面的参数研究来研究每个提出的解决方案的最佳调整,以显示如何优化每个解决方案的效率。特别是,TMD和VI-ABH对振动幅度显示出轻微的依赖性,而NES和BNES的性能在中等幅度时具有效率峰值。定义频率指示器以表征和比较所有解决方案的性能。仿真结果清楚地表明,所有提出的方法都能够以宽带方式有效地抑制弯曲振动。然后,通过全面的参数研究来研究每个提出的解决方案的最佳调整,以显示如何优化每个解决方案的效率。特别是,TMD和VI-ABH对振动幅度显示出轻微的依赖性,而NES和BNES的性能在中等幅度时具有效率峰值。然后,通过全面的参数研究来研究每个提出的解决方案的最佳调整,以显示如何优化每个解决方案的效率。特别是,TMD和VI-ABH对振动幅度显示出轻微的依赖性,而NES和BNES的性能在中等幅度时具有效率峰值。然后,通过全面的参数研究来研究每个提出的解决方案的最佳调整,以显示如何优化每个解决方案的效率。特别是,TMD和VI-ABH对振动幅度显示出轻微的依赖性,而NES和BNES的性能在中等幅度时具有效率峰值。

更新日期:2020-07-24
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