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Passive cancellation of low frequency sound waves using optimized embedded mechanisms.

机译：使用优化的嵌入式机制可被动消除低频声波。

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摘要

A passive and lightweight technology to cancel low frequency sound was investigated. Simple lightweight mechanisms were embedded inside a double walled panel to radiate destructively interfering waves. The embedded mechanisms induce out-of-phase motions that destructively interfere with radiation from the panel's in-phase motions. A panel embedded with these mechanisms was found to cancel more sound than heavier equivalent barriers. An optimization process was developed to configure the mechanism placements for maximum sound cancellation. A finite element direct coupling method was used to relate the acoustic cavity interactions to the panel's plates. This direct method was advantageous because it was compatible with all types of acoustic and structure finite elements, and did not require formation of a coupling matrix. Topology optimization was used to explore other possible geometries of the mechanisms. The results of the optimal placements, boundary interactions, and the new machine geometry, resulted in the construction of an optimized sound panel. Experimental studies of the panels were conducted with a laser-Doppler scanning vibrometer, from which the acoustic power was then extrapolated directly from the surface vibrations. Two optimized panels produced less sound than a baseline panel with the same number of mechanisms by an average of 15.7 dB and 5.6 dB over the low frequency range of 550 Hz.
机译：研究了一种消去低频声音的无源轻量级技术。简单的轻巧机制被嵌入到双壁面板内部，以辐射破坏性干扰波。嵌入式机制会引起异相运动，从而破坏性地干扰面板同相运动产生的辐射。发现嵌有这些机制的面板比重的等效障碍物能消除更多的声音。开发了一种优化过程，以配置用于最大程度消除声音的机构位置。使用有限元直接耦合方法将声腔相互作用与面板的板联系起来。这种直接方法是有利的，因为它与所有类型的声学和结构有限元兼容，并且不需要形成耦合矩阵。使用拓扑优化来探索该机制的其他可能的几何形状。最佳放置，边界相互作用和新的机器几何结构的结果导致了优化的音板的构建。用激光多普勒扫描振动仪进行面板的实验研究，然后从表面振动直接推断出声功率。在550 Hz的低频范围内，使用相同数量的机制，两个经过优化的面板产生的声音比基线面板要少，平均分别为15.7 dB和5.6 dB。

著录项

  • 作者

    Lu, Paul ChihPeng.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Engineering Aerospace.;Physics Acoustics.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 229 p.
  • 总页数 229
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:19

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