| 唐世灏,叶韩峰,陶猛,李政杰.水下蜂窝空腔覆盖层的隔声性能分析[J].声学技术,2017,36(5):437~441 |
| 水下蜂窝空腔覆盖层的隔声性能分析 |
| Sound insulation performance of underwater honeycomb cavity covering |
| 投稿时间：2016-10-14 修订日期：2016-12-10 |
| DOI：10.16300/j.cnki.1000-3630.2017.05.007 |
| 中文关键词: 蜂窝空腔 黏弹性覆盖层 隔声量 三传声器法 |
| 英文关键词: honeycomb cavity viscoelastic covering sound transmission loss three-microphone method |
| 基金项目:国家自然科学基金项目（51365007、51765008）；贵州省高层次创新型人才培养项目（黔科合人才[2016]4033） |
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| 中文摘要: |
| 针对驻波管隔声量测试过程中，透射管末端反射波难以消除并对测试结果有一定影响的问题，利用LMS Virtual.lab有限元软件建立了驻波管隔声量测试的仿真模型。在模型中设置无反射边界条件，基于该模型分析了蜂窝空腔覆盖层的隔声性能，指出蜂窝空腔覆盖层的隔声特性是阻抗失配、波型转换、阻尼损耗等多种机理共同作用的结果，蜂窝结构的胞元壁厚、胞元夹角、黏弹性材料的杨氏模量等参数变化对隔声量的影响较为明显。消除了入射管端面和透射管端面的反射波，并通过与解析方法的计算结果对比验证了模型的正确性。 |
| 英文摘要: |
| Because the reflected wave from the downstream tube can not be totally eliminated in the standing-wave tube, which would affect the accurate measurement of sound transmission loss, the simulation model of measuring sound transmission loss in the standing-wave tube is presented by using LMS Virtual.lab software. The non-reflected boundary conditions are defined in the present model. Then, the sound insulation performance of honeycomb cavity covering is analyzed and discussed based on the present model. It is summarized that the mechanism of sound insulation performance includes impedance mismatch, waveform transformation and damping loss. Moreover, the effects of the cell thickness, cell angle and viscoelastic Young's modulus of the honeycomb structure on the sound insulation performance of honeycomb cavity covering are more obvious. The present model has been validated by comparing the numerical results of the analytical method, which can eliminate the reflected waves from the end surfaces of the upstream tube and the downstream tube. |
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