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汽车工程
2006年(第 28卷)第 12期 Automotive Engineering 2006 (Vol. 28) No. 12
2006243
轿车声固耦合低频噪声的有限元分析
惠巍,刘更,吴立言
(西北工业大学机电学院,西安 710072)
[摘要] 建立结构载荷激励下乘坐室空腔声学系统和声固耦合系统的有限元模型。利用有限元软件 ANSYS
和 LMS V irtual. lab对某轿车乘坐室结构与空腔声模态的频率和振型进行分析,采用直接法和模态叠加法对该轿车
车内噪声仿真结果进行比较,指出采用模态叠加法计算声固耦合问题时,对于结构模态阶数的提取要求。通过计算
仿真分析该模型低频噪声在频域中的分布情况,为降低由结构振动引起的车内低频噪声提供结构修改和声学修改
依据。
关键词:乘坐室,有限元模型,声固耦合,模态叠加法
Finite Element Analysis on the Car Interior Low frequency Noise
with Acoustic structural Coup ling
Hu iW e i, L iu Geng & W u L iyan
School of M echatronic Engineering, N orthw estern Polytechnical University, X i’an 710072
[ Abstract] A finite element model for the structure, cavity acoustics and acoustic structure coup ling system
of the partment in a car is established. By making use of FEA software ANSYS and LMS virtual. lab,
a modal analysis is performed and the structural vibration modes and cavity acoustic modes of partment are
obtained. In car noise simulation is conducted with both the direct and modal superposition methods, and it is found
that using modal superposition method can get almost identical results in around 10 times less time, p rovided that
sufficient number of modes are included. Finally the distribution of interior low frequency noise in frequency domain
is studied. These p rovide a basis for structural and acoustic modifi