嵌入定期ABH和分布DVA用于薄壁结构中的被动低频宽带振动减弱
Xiu-Xian Jia1, Ye Yu2, Yu Du3
1Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, Xihua University, Chengdu, 610039, China.
Scientific reports
|August 9, 2024
概括
这项研究通过整合动态振动吸收器 (DVA) 来增强声学黑洞 (ABH) 结构中的低频振动抑制. 优化的DVA放置显著改善宽带振动减弱,特别是在较低的频率.
科学领域:
- 机械工程 机械工程
- 结构动力学 结构动力学
- 声学 声学 在声学方面
背景情况:
- 声学黑洞 (ABH) 结构有效地将能量集中在切断频率以上,以抑制振动.
- ABH结构显示了低于切断频率的能量聚焦性能降低,需要低频增强.
- 薄壁结构需要改进的振动减弱方法,特别是在低频谱中.
研究的目的:
- 在薄壁系统中对分布式动态振动吸收器 (DVA) 与ABH结构的集成进行数值研究.
- 增强ABH结构的低频宽带振动降低能力.
- 分析DVA设计参数和固定位置对振动减弱的影响.
主要方法:
- 对ABH薄壁结构进行数值分析,以根据焦点特征确定最佳的DVA附着点.
- 与ABH结构集成的分布式动态振动吸收器 (DVA) 的模拟.
- 探索DVA设计参数及其对宽带阻尼效应的影响.
主要成果:
- 为低频设计的DVA在特定的ABH聚焦位置放置时,可以在整个频谱中实现显著的振动减弱.
- 与仅依赖ABH结构相比,DVA的集成提供了优越的宽带振动减弱,即使在低频率下也是如此.
- 优化的DVA放置在整个频段产生了更大的整体振动减弱,尽管与最大响应点相比,低频振幅减弱略有减少.
结论:
- 分布式动态振动吸收器 (DVA) 有效地增强了声黑洞 (ABH) 结构的低频振动衰减.
- 在ABH聚焦点上DVA的战略放置对于在薄壁结构中实现宽带振动抑制至关重要.
- 这项研究为优化ABH和DVA联合使用的先进振动控制解决方案提供了一条途径.
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