阻性管道消声性能预测的边界元数值配点混合方法  

Acoustic attenuation prediction of dissipative ducts by combining boundary element method and numerical point collocation approach

作　　者：杨亮[1] 季振林[1] 

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001

出　　处：《振动工程学报》2016年第3期498-503,共6页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(11174065)

摘　　要：将边界元方法与配点法结合形成一种混合方法用于大尺度阻性管道的声学性能预测,根据截面形式,整个结构被划分为若干子结构,边界元方法与配点法分别被用于计算非规则结构和规则结构的阻抗矩阵,最后将各阻抗矩阵连接起来用于传递损失的计算。由于管道进出口为非平面波传播,考虑对进出口配点进行模态展开,将阻抗矩阵转化为散射矩阵,使用进出口的声功率计算传递损失。通过与数值方法和实验值比较验证了方法的正确性,进而应用该方法对管道消声性能进行分析。A technique combining boundary element method(BEM)and point collocation approach(PCA)is proposed to evaluate the acoustic attenuation performance of dissipative ducts.The duct is divided into several substructures according to its different cross-section shapes.The BEM and PCA are employed to calculate the impedance matrices of the substructures with regular shape cross-sections and irregular shape cross-sections,respectively,and then the impedance matrices for the whole structures are assembled toghether.Due to the non-plane wave propagation,the scattering matrix is obtained from impedance matrix by expanding the modes of the collocation points at inlet and outlet planes and then sound power is adopted to calculate the transmission loss(TL).The combined technique is verified by numerical method and experiment results.The influence of structural variables on the transmission loss is analyzed,which shows that increasing the flow resistivity of the sound-absorbing material and increasing the perforation ratio of perforated plate may improve the attenuation performance of dissipative ducts.

关 键 词：消声 传递损失 阻性管道 边界元方法 配点法 

分 类 号：TB535[理学—物理]