Position Optimization of Passive Patch Based on Mode Contribution Factor for Vibration Attenuation of Asymmetric 1D Structure

IF 1.2 4区工程技术 Q3 ACOUSTICS

Shock and Vibration Pub Date : 2024-02-26 DOI:10.1155/2024/8891523

Dongwoo Hong, Kyeongnak Lee, Byeongil Kim

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引用次数: 0

Abstract

When the thickness of a structure is reduced to decrease weight, it may experience structural vibration and disturbance. The use of passive patches is effective in addressing this issue when the loss factor is small or when space and weight are restricted. The greatest attenuation occurs when passive patches are used across the entire coverage area. However, passive patches of reasonable size must be affixed to ensure that they are effective in terms of cost and design. In this paper, the sum of squares’ value for the bending mode shape is used to determine the location of a small passive patch to achieve vibration damping for multiple modes. Under the condition of forced vibration, the modal contribution of each mode is obtained. Using this contribution as a weight, the optimal position of the passive patch is determined as the maximum value obtained in the form of a linear combination multiplied by the curvature of the beam. Simulation and experiment were used to test the efficacy of the location determined for passive patches. It was determined that, depending on the location of the passive patch, the peak amplitude at the natural frequency of each mode decreased significantly, validating the effectiveness of the design method.

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基于模式贡献因子的无源贴片位置优化，用于非对称一维结构的振动衰减

当为减轻重量而减小结构厚度时，可能会出现结构振动和干扰。当损耗因数较小或空间和重量受到限制时，使用无源贴片可有效解决这一问题。在整个覆盖区域使用无源补丁时，衰减效果最好。不过，必须贴上尺寸合理的无源贴片，以确保其在成本和设计方面的有效性。本文利用弯曲模态形状的平方和值来确定小型无源贴片的位置，以实现多种模态的减振效果。在强制振动条件下，可获得每个模态的模态贡献。将该贡献值作为权重，以线性组合形式得到的最大值乘以梁的曲率，从而确定被动贴片的最佳位置。模拟和实验用于测试为无源贴片确定的位置的有效性。结果表明，根据被动贴片的位置，各模式固有频率处的峰值振幅明显减小，验证了设计方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Shock and Vibration 物理-工程：机械

CiteScore

3.40

自引率

6.20%

发文量

384

审稿时长

3 months

期刊介绍： Shock and Vibration publishes papers on all aspects of shock and vibration, especially in relation to civil, mechanical and aerospace engineering applications, as well as transport, materials and geoscience. Papers may be theoretical or experimental, and either fundamental or highly applied.