摘要
将等几何有限元方法应用于消声管道的声学性能计算,使用二维等几何有限元方法求解管道截面的声学特征值,考虑了存在穿孔边界和吸声材料边界的情况,进而使用特征值计算消声管道的传递损失。对包覆式消声管道进行传递损失的计算,结果与二维有限元方法吻合较好.对圆形截面的特征值计算结果表明,在计算量相同的情况下,等几何有限元方法取得了比传统有限元方法更好的计算精度.在不同结构参数条件下对消声管道的声学性能进行计算,结果与三维数值方法吻合良好。方法能够在宽频范围内较好地预测消声管道的传递损失。
The two dimensional(2D)IsoGeometric Finite Element Method(IG-FEM)is applied to predict the acoustic attenuation performance of silencing ducts.Acoustic eigenvalues of duct cross-section are obtained by 2D IG-FEM and then the Transmission Loss(TL)is calculated.Perforated boundary and sound-absorbing material boundary are also considered.TL results of a rectangular silencing duct agree well with those obtained from the FEM and the accuracy of the IG-FEM is verified.Test case of a round cross section demonstrates that IG-FEM obtains more accurate results than the FEM does at almost the same computation cost.Under several different structure parameter conditions,TL of test examples by the IG-FEM are well compared with 3D numerical method.The IG-FEM can accurately predict the TL over a wide frequency range.
作者
杨亮
孙红灵
杨军
YANG Liang;SUN Hongling;YANG Jun(Key Laboratory of Noise and Vibration Research,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)
出处
《声学学报》
EI
CAS
CSCD
北大核心
2021年第6期1185-1192,共8页
Acta Acustica
基金
国家自然科学基金项目(11474306,11472289)
中国科学院青年创新促进会项目资助。
