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Effect of multi-layered IIR/EP on noise reduction of aluminium extrusions for high-speed trains

机译：多层IIR / EP对高速列车铝挤压降噪的影响

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摘要

Damping treatment is effective for noise and vibration control. However, there is a lack of research on the relationship between the fabrication and mechanical property characterisation of damping materials and the vibroacoustic characteristic analysis after damping materials are applied to actual composite structures. We performed such a study. First, modified butyl rubber (IIR) with high damping performance was prepared, and its frequency-dependent elastic modulus and loss factor were identified. Second, the vibration and damping characteristics of the modified IIR used in multi-layered constrained-layer damping (MLCLD) were investigated via cantilever-beam experiments and simulations. Third, the noise reduction (both sound radiation and sound insulation) effects of the MLCLD on aluminium extrusions were examined using prediction models, which were validated according to acoustic laboratory tests. The results indicated that the structural vibroacoustic characteristics are affected by not only the number of layers but also the application objects, structural parameters, and material properties. The final lightweight optimisation design of the aluminium extrusion using the MLCLD reduced the radiated sound power level by 2.7 dB, improved the sound insulation level by 3.0 dB, and reduced the total mass by 14.4%.
机译：阻尼处理对于噪声和振动控制是有效的。然而，缺乏对阻尼材料的制造和机械性能之间的关系的研究以及阻尼材料应用于实际复合结构后的纵岩特性分析。我们进行了这样的研究。首先，制备具有高阻尼性能的改性丁基橡胶（IIR），并鉴定其依赖依赖性弹性模量和损耗因子。其次，通过悬臂梁实验和模拟研究了多层约束层阻尼（MLCLD）中使用的改进的IIR的振动和阻尼特性。第三，使用预测模型检查MLCLD对铝挤出的降噪（声辐射和隔音）效果，这些模型根据声学实验室测试验证。结果表明，结构纵岩特性不仅受到层数，而且是应用对象，结构参数和材料特性的影响。使用MLCLD的铝挤出的最终轻量级优化设计将辐射声功率水平降低2.7 dB，将隔音水平提高3.0 dB，并将总质量降低14.4％。

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  • 来源
    《Composite Structures》 |2021年第4期|113638.1-113638.11|共11页
  • 作者

    Zhang Jie; Yao Dan; Shen Menglu; Wang Ruiqian; Li Jiang; Guo Shaoyun;

  • 作者单位

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Southwest Jiaotong Univ State Key Lab Tract Power Chengdu 610031 Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Changzhou Univ Sch Mech Engn & Rail Transit Changzhou 213164 Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China;

    Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 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

    Damping; Multiple layer; Butyl rubber; Composite structures; Sound radiation; Sound insulation;

    机译：阻尼;多层;丁基橡胶;复合结构;声辐射;隔音;

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