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气垫隔声结构水中隔声性能分析
引用本文:周涛,陈志坚.气垫隔声结构水中隔声性能分析[J].噪声与振动控制,2013,33(2):68-72.
作者姓名:周涛  陈志坚
作者单位:( 海军工程大学 船舶与动力学院, 武汉 430033 )
摘    要:提出气垫隔声结构形式,与以橡胶阻尼材料为基体的隔声去耦瓦相比,气垫隔声结构具有孔隙率大的特点,能更好的隔声去耦。用解析方法分析无限、有限气垫隔声结构在水中的隔声性能,研究板厚与中间层特性声阻抗对隔声量的影响并分析无限结构与有限结构的差别。结果表明:在水中的隔声曲线中没有在空气中因“质量―弹簧―质量”共振造成的隔声低谷现象,且在低频时有限结构的隔声性能较好。行波管声学试验测试了气垫双层板结构的低频隔声性能,证实气垫隔声结构在水中的隔声效果和其在水中声学性能的正确性。

关 键 词:声学  气垫隔声  水中隔声性能  特性声阻抗  行波管试验  
收稿时间:2012-04-18

Analysis of Underwater Performance of Sound Insulation Structure with Air Cushion
Abstract:The sound insulation structure with air cushion is raised in this article. Compared with the isolating-sound and decoupled title based on rubber damp material, it is characterized by higher cavity rate, which can lead better performance on sound insulation and decoupling. The underwater sound insulation performance of infinite double-leaf panel is studied with analytical method. The STL dip due to the “mass-spring-mass” resonance disappears and there exists a better performance with in low frequencies, compared with those of in air condition. The effects on STL of panel thickness and specific impendence of middle layer are analyzed respectively; it shows that the STL almost all depends on the latter. Traveling wave acoustic measurement is carried to investigate finite-sized structure, demonstrating its high performance. The experimental data show that the STL dips appears at certain nature frequencies of the panels.
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