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敷设声学覆盖层的圆柱壳体腔内噪声仿真分析
时间: 2021-01-18 17:48     作者: 菠菜app

  敷设声学覆盖层的圆柱壳体腔内噪声仿真分析_物理_自然科学_专业资料。针对飞机舱内噪声问题,将飞机机身等效为圆柱壳结构,采用实验研究和数值模拟相结合的方法研究圆柱壳内衬不同声学敷设材料的中低频(150Hz-700Hz)降噪特性.基于 Acoustic声学软件,建立有限元模型;并搭建实验装置,测得圆柱壳内部声学响应以验证模型在中低频段的准确性.数值模拟比较三聚氰胺泡沫

  第35卷第8期 文章编号:1006—9348(2018)08—0429—05 计算机仿线月 敷设声学覆盖层的圆柱壳体腔内噪声仿真分析 何旭,晏石林,李彬,闫文杰 (武汉理工大学新材料力学理论与应用湖北省重点实验室,湖北武汉430070) 摘要:针对飞机舱内噪声问题,将飞机机身等效为圆柱壳结构,采用实验研究和数值模拟相结合的方法研究圆柱壳内衬不同 声学敷设材料的中低频(150Hz一700Hz)降噪特性。基于Virtual.1ab Acoustic声学软件,建立有限元模型;并搭建实验装置, 测得圆柱壳内部声学响应以验证模型在中低频段的准确性。数值模拟比较三聚氰胺泡沫和吸音棉的降噪效果,探究敷设材 料厚度对降噪量的影响。结果表明:相同质量或相同厚度条件下,三聚氰胺泡沫的降噪效果均优于吸音棉的降噪效果。结 果分析可得,材料敷设质量一定,厚度越小,单位厚度降噪效率越高;材料敷设面积一定,厚度越大,单位面积降噪效率越高。 关键词:圆柱壳;声学敷设材料;降噪;仿线 文献标识码:B Simulation Analysis of Cylindrical Shell Cavity Noise with Acoustic Cover HE Xu,YAN Shi—lin,LI Bin,YAN Wen—jie (Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology,Wuhan Hubei 430070,China) ABSTRACT:In order to solve the problem of noise in the aircraft cabin,the airplane fuselage was dealt as an equiv- alent to the cylindrical sheH structure,and based on that,the low frequency(150Hz一700Hz)noise reduction char- acteristics of different acoustic laying materials were studied by means of experimental study and numerical simula- tion.Based on Virtual.1ab Acoustic software,the finite element model Was established and the experimental device Was built to measure the internal acoustic response of the cylindrical shell and verify the accuracy of the model in the middle and low frequency bands.Numerical simulation Was used to compare the noise reduction effect of melamine foam and sound absorbing cotton,and the influence of laying material thickness on noise reduction Was explored.The results show that the noise reduction effect of melamine foam is better than that of sound absorbing cotton under the same mass or the same thickness.The conclusion can be drawn as follow:for a given mass limit.the smaller thick. ness of the laying material,the higher efficiency of the unit thickness noise reduction;for a given area limit,the higher thickness of the laying material,the higher efficiency of noise reduction per unit area. KEYWORDS:Cylindrical shell;Acoustic layer material;Noise reduction;Simulation 1 引言 近年来,随着人们生活水平的不断提高和环保意识的不 断增强,其对居住环境的要求也越来越高,噪声问题也越来 越引起人们的重视…。圆柱壳体作为汽车、轮船、飞机、潜艇 等机械结构上的一种常用结构,常被用来保护壳体内部某些 结构和精密仪器,若不能将壳内声学响应值控制在一定范围 基金项目:中央高校基本科研业务费专项资金资助(201718016) 收稿日期:2017—05—04修回日期:2017—05—31 内,则会引起结构和精密仪器的损坏悼j。因此,本文以某飞 机机身为研究对象,将其等效为圆柱壳,对飞机舱内噪声进 行仿真分析。 目前对噪声的控制主要采用在结构表面粘贴阻尼减振 材料、隔声材料、吸声材料的被动控制方法来达到减弱噪声 的目的。陈美霞口。将粘弹性阻尼材料敷设到圆柱壳表面,详 细讨论了阻尼层厚度、弹性模量、损耗因子等参数对双层圆 柱壳振动和声辐射的影响。苑改红L41对具有不同结构参数 的三聚氰胺泡沫的降噪特性进行研究,并将其应用到船艇机 舱上,发现三聚氰胺泡沫在中高频具有良好的降噪效果。 ...——429...

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