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首页> 外文期刊>Applied Acoustics >Reduction of Bloch-Floquet bending waves via annular acoustic black holes in periodically supported cylindrical shell structures
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Reduction of Bloch-Floquet bending waves via annular acoustic black holes in periodically supported cylindrical shell structures

机译：在周期性支撑的圆柱形壳体结构中通过环形声黑洞通过环形声黑洞减小波形弯曲波

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摘要

In recent years, acoustic black holes (ABHs) have revealed as a very effective method for the passive reduction of vibrations in flat plates and straight beams. Those essentially consist of circular indentations and/or side boundaries, whose thicknesses decrease to zero following a power-law profile. Nonetheless, many structures in the aeronautical and naval sectors, among others, involve cylindrical structures with periodic stiffeners or supports. Such periodic structures admit the propagation of Bloch-Floquet (BF) bending waves at some frequency passbands, which may result in strong vibration levels and noise radiation. In this work, we propose the design of annular ABHs to mitigate the problem. A wave finite element model is first used to determine the frequency passbands on an ideal, periodically simply supported cylindrical shell of infinite length, with embedded annular ABHs. Then, a long, but now finite simply supported cylindrical shell is presented to show how the transmissibility between two sections strongly diminishes with the inclusion of ABHs. That confirms annular ABHs as a very effective means of reducing BF wave propagation. Unfortunately, embedding ABHs on the shell weakens its structural rigidity so a thorough analysis is made on the effects of inserting stiffeners in the longitudinal direction to partially remedy that inconvenient. Quite surprisingly, it is shown that the inclusion of stiffeners can even enhance the performance of the ABHs for some configurations. To finally foresee the potential of annular ABHs for practical applications, a finite element simulation is made on a slightly more realistic geometry, resembling a very simplified version of the hull of a submarine vehicle or a gas tank. (C) 2020 Elsevier Ltd. All rights reserved.
机译：近年来，声学黑洞（ABHS）已透露为平板和直梁中的振动被动减少的非常有效的方法。那些基本上由循环压痕和/或侧边界组成，其厚度在动力法概况之后的厚度降低到零。尽管如此，航空和海军部门中的许多结构等涉及具有周期性加强件或支撑的圆柱形结构。这种周期性结构承认在某些频率通带处的波峰 - 浮子（BF）弯曲波的传播，这可能导致强振动水平和噪声辐射。在这项工作中，我们提出了环形ABH的设计来减轻问题。首先使用波有限元模型来确定频率通带，在理想的周期性地支持的无限长度的圆柱形外壳上，具有嵌入的环形ABHS。然后，提出了长期，但现在有限的简单支持的圆柱形外壳表明，在包含ABHS时，两个部分之间的传动性如何强烈地减小。确认环形ABHS作为减少BF波传播的非常有效的方法。遗憾的是，嵌入壳体上的ABH削弱了其结构刚性，因此对纵向插入纵向的效果彻底分析，以部分地补救不方便。令人惊讶的是，显示加强剂的包含甚至可以增强ABHS的某些配置的性能。为了最终预见到实际应用的环形ABH的潜力，有限元模拟在稍微更现实的几何形状上进行，类似于潜艇车辆的船体的非常简化的版本或气罐。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Applied Acoustics》 |2020年第12期|107424.1-107424.13|共13页
  • 作者

    Deng Jie; Guasch Oriol; Maxit Laurent; Zheng Ling;

  • 作者单位

    Chongqing Univ State Key Lab Mech Transmiss Coll Automot Engn Chongqing 400044 Peoples R China|Univ Ramon Llull GTM Grp Recerca Tecnol Media C Quatre Camins 30 Barcelona 08022 Catalonia Spain;

    Univ Ramon Llull GTM Grp Recerca Tecnol Media C Quatre Camins 30 Barcelona 08022 Catalonia Spain;

    INSA Lyon Lab Vibrat Acoust LVA 25 Bis Av Jean Capelle F-69621 Villeurbanne France;

    Chongqing Univ State Key Lab Mech Transmiss Coll Automot Engn Chongqing 400044 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Annular acoustic black holes (ABHs); Periodic structures; Bloch-Floquet waves; Stiffeners; Cylindrical shells;

    机译：环形声学黑洞（ABHS）;周期性结构;布解浮子波;加强件;圆柱形壳;

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