Sound transmission across lightweight all-metallic sandwich panels with corrugated cores  

作　　者：XIN Fengxian LU Tianjian CHEN Changqing 

机构地区：[1]MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi'an Jiaotong University Xi'an 710049

出　　处：《Chinese Journal of Acoustics》2009年第3期231-243,共13页声学学报（英文版）

基　　金：supported by the National Basic Research Program of China(2006CB601202);the National111 Project of China(B06024);the National Natural Science Foundation of China(10572111,10632060);the National High Technology Research and Development Program(2006AA03Z519).

摘　　要：The transmission of sound through all-metallic sandwich panels with corrugated cores is investigated using the space-harmonic method. The sandwich panel is modeled as two parallel panels connected by uniformly distributed translational springs and rotational springs, with the mass of the core sheets taken as lumped mass. Based on the periodicity of the panel structure, a unit cell model is developed to provide the effective translational and rotational stiffness of the core. To check the validity of the model, it is used first to study the sound insulation properties of double-panel structures with air cavity, and the analytical predictions agree well with existing experimental data. The model is then employed to quantify the influence of sound incidence angle and the inclination angle between facesheet and core sheet on sound transmission loss （STL） across sandwich panels with corrugated cores. The results show that the inclination angle has a significant effect on STL and it is possible to avoid STL dips by altering the inclination angle. Moreover, it is found that sandwich panels with corrugated cores are more suitable for the insulation of sound waves having small incidence angles.The transmission of sound through all-metallic sandwich panels with corrugated cores is investigated using the space-harmonic method. The sandwich panel is modeled as two parallel panels connected by uniformly distributed translational springs and rotational springs, with the mass of the core sheets taken as lumped mass. Based on the periodicity of the panel structure, a unit cell model is developed to provide the effective translational and rotational stiffness of the core. To check the validity of the model, it is used first to study the sound insulation properties of double-panel structures with air cavity, and the analytical predictions agree well with existing experimental data. The model is then employed to quantify the influence of sound incidence angle and the inclination angle between facesheet and core sheet on sound transmission loss （STL） across sandwich panels with corrugated cores. The results show that the inclination angle has a significant effect on STL and it is possible to avoid STL dips by altering the inclination angle. Moreover, it is found that sandwich panels with corrugated cores are more suitable for the insulation of sound waves having small incidence angles.

关 键 词：with 细胞模型 集中质量 面板结构 传输损耗 夹芯板 STL 空间谐波 

分 类 号：O326[理学—一般力学与力学基础] G633.41[理学—力学]