基于三维有限元分析的汽车风道材料降噪方法.PDFVIP

第37 卷 第4 期 噪 声 与 振 动 控 制 Vol 37 No.4 2017 年8 月 NOISE AND VIBRATION CONTROL Aug. 2017 文章编号：1006-1355(2017)04-0206-03+217 基于三维有限元分析的汽车风道材料降噪方法 刘 昉，王争论，康 伟 （上海泰瑞电子科技有限公司，上海 201402 ） 摘 要：声波在汽车空调通风道道中主要以平面波成分出现，然而，当声波的波长大于管道截面尺寸时，就会出现 高次波成分，采用一维计算方法或二维方法就会出现较大的误差，三维有限元方法能够有效解决计算过程中出现的误 差。采用传递函数法在阻抗管中对PE 发泡材料和三种面密度的模压织物平板材料吸声系数进行测试。测试结果表 明，闭孔发泡塑料吸声性能最差，模压织物面密度越大，吸声性能越好。以测得的阻抗作为边界条件，采用三维有限元 方法，对直管风道样件管口辐射噪声。直管样件测试和仿真分析结果表明，模压织物材料的面密度对隔声性能影响较 小，900 gsm 模压织物风道比500 gsm 和700 gsm 改善0.8 dB 左右，模压织物比发泡塑料噪声改善3 dB 。 关键词：声学；汽车空调风道；三维有限元方法 ；PE 发泡材料；模压成型织物；吸声性能 中图分类号：U467 文献标识码：A DOI 编码：10.3969/j.issn. 1006-1355.2017.04.041 Noise Reduction Method for Air Duct Materials of Automobiles Based on 3D Finite Element Analysis LIU Fang , WANG Zheng-lun , KANG Wei ( Shanghai Tairich Electronic Technology Company, Shanghai 201402, China ) Abstract : The sound wave appears in air duct of automobiles mainly in the type of plane wave components. However, when the wavelength of the sound is larger than the dimension of the air-duct cross section, high-order wave components will appear. In this case, the computations using one-dimensional method or two-dimensional method will bring large errors. However, the three- dimension finite element analysis can yield precise results of computation. In this paper, the sound absorption coefficients of PE foam and three non-woven fabrics with different area densities are tested in an impedance tube using transfer function method. The testing results reveal that the PE foam has poor absorption perfo