汽车用棉毡的声学材料参数研究与验证  

Research and Verification of Acoustic Material Parameters ofAutomobile Felt

作　　者：林连娣 郑冠崔 王险峰 冯晖 LIN Lian-di;ZHENG Guan-cui;WANG Xian-feng;FENG Hui(Guangzhou Linjun Co.,Ltd,Guangzhou 511356,China)

机构地区：[1]广州林骏汽车内饰件有限公司,广州511356

出　　处：《汽车科技》2023年第1期39-43,共5页Auto Sci-Tech

摘　　要：汽车用棉毡是汽车声学包中常见的多孔材料,基于BIOT理论对其材料参数进行测试,并利用FOAM-X仿真软件对材料参数进行灵敏度分析,得出该车用棉毡在具体频段下受哪个材料参数的影响,通过改变棉毡的材料组分和生产工艺,最终对分析出来的材料参数进行调整,从而使得棉毡的吸音性能提升。结果显示,通过FOAM-X仿真分析可知,汽车用棉毡的低频主要受热特征长度和流阻率影响,而中高频主要受粘性特征长度和流阻率影响。通过降低棉毡纤维直径并结合气流成网工艺,可减小棉毡的粘性特征和热特征长度并增大其流阻率,从而提升棉毡的吸音性能。The automobile cotton felt is a common porous material in the automobile acoustic package.The material parameters are tested based on the BIOT theory,and the sensitivity analysis of the material parameters is carried out using the FOAM-X simulation software.It is concluded that the automobile cotton felt is affected by the material parameters in the specific frequency band.By changing the material composition and production process of the cotton felt,the analyzed material parameters are finally adjusted,so as to improve the sound absorption performance of the cotton felt.The results show that,through FOAM-X simulation analysis,the low frequency of automotive cotton felt is mainly affected by the thermal characteristic length and flow resistance,while the medium and high frequency are mainly affected by the viscous characteristic length and flow resistance.By reducing the fiber diameter of the cotton felt and combining with the air flow web forming process,the viscous and thermal characteristic length of the cotton felt can be reduced and its flow resistance can be increased,thus improving the sound absorption performance of the cotton felt.

关 键 词：多孔材料 材料参数 BIOT理论 细纤维 气流成网 吸音 

分 类 号：U465[一般工业技术—材料科学与工程]