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Measuring acoustic attenuation of polymer materials using drop ball test.

机译:使用落球测试测量聚合物材料的声衰减。

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摘要

Polymers are often used for vibration damping and energy absorption. The effect of a material in reducing the strength of sound waves traveling through it is called acoustic attenuation. In the past, attenuation has mostly been evaluated in the MHz frequency range, using a pulse generator and transmitting transducer as the wave source. However, most real acoustic activities occur at frequencies up to a few hundred kHz. Here, a simple drop ball mechanism is used to generate acoustic source waves in the kHz range, and the attenuation capacities of several solid materials are measured. The recorded waveforms substantially differ between materials. The results show that among the tested polymers, epoxy attenuates the least, rubbers the most, while polyethylene and polyester are also excellent attenuating materials. The drop ball mechanism is controllable and consistent which may be used for other impact or acoustic emission testing. The effect of mixing in additives for the attenuation capacity of epoxy is also investigated.
机译:聚合物通常用于减振和吸收能量。材料在降低传播通过它的声波强度方面的作用称为声衰减。过去,使用脉冲发生器和发射换能器作为波源,主要在MHz频率范围内评估衰减。但是,大多数真实的声活动发生在高达几百kHz的频率上。在这里,使用一种简单的落球机制来生成kHz范围内的声源波,并测量几种固体材料的衰减能力。记录的波形在材料之间基本上不同。结果表明,在测试的聚合物中,环氧树脂的衰减最小,橡胶的衰减最大,而聚乙烯和聚酯也是优异的衰减材料。落球机构是可控且一致的,可用于其他冲击或声发射测试。还研究了混合添加剂对环氧树脂衰减能力的影响。

著录项

  • 作者

    Zhang, Yi.;

  • 作者单位

    Embry-Riddle Aeronautical University.;

  • 授予单位 Embry-Riddle Aeronautical University.;
  • 学科 Engineering Aerospace.;Chemistry Polymer.;Engineering Materials Science.
  • 学位 M.S.A.E.
  • 年度 2013
  • 页码 120 p.
  • 总页数 120
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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