基于结构-声耦合法的汽车镁质仪表板声贡献度分析及结构改进  

Sound contribution analysis and structural modification for a magnesium dash with structure-sound interaction method

作　　者：张磊[1] 郝志勇[1] 

机构地区：[1]浙江大学能源工程学系,杭州310027

出　　处：《振动与冲击》2013年第13期176-181,共6页Journal of Vibration and Shock

基　　金：十二五科技支撑计划(2011BAE22B05)

摘　　要：利用结构-声耦合法对仪表板进行声传递损失分析,与隔声实验对比验证了该方法的可靠性和方便性。与钢制仪表板进行隔声性能对比,证明镁质仪表板具有很好的隔声性能。建立仪表板声辐射模型,利用镁质仪表板对入射声场的响应,计算得到仪表板在驾驶室侧的辐射声场,找出辐射声压和声功率峰值频率。通过对声功率和透射声场声压最大处的声贡献度分析,确定了对隔声低谷影响最大的区域。针对该区域进行结构更改从而改变模态值,对其进行计算隔声量。结果表明,改进后的仪表板隔声低谷比改进前提升5 dB,仪表板整体隔声性能提高。Sound transmission loss of a dash was analyzed with the structure-sound interaction method.Compared with a sound isolation test,the method was verified to be reliable and feasible.In contrast with a steel dash＇s sound isolation performance,a magnesium one was found to have good sound isolation performance.By dividing the dash into several panels and with the response of the dash to an incident sound field,the dash sound radiation model was built to calculate the radiation sound field of the dash at a side of a driving room and to find frequencies where the peak values of radiating sound pressure and sound power appear.With sound contribution analyses of the points having the highest sound pressure and acoustic power,the region having the biggest influence on sound transmission loss valley was determined.Structural modification of this area was made to change the modes of the dash and the sound transmission loss was calculated for the modified dash.The results showed that the sound transmission loss valley increases by 5 dB after the modification,and the whole sound isolation performance of the modified dash is enhanced.

关 键 词：结构-声耦合法 镁 隔声 声贡献度 隔声低谷 

分 类 号：TB532[理学—物理]