基于FEM_BEM变速器箱体辐射噪声的研究.pdf

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基于 FEM /BEM 变速器箱体辐射噪声的研究 5
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文章编号: 1006 - 1355 (2007) 05 - 0107 - 05
基于 FEM /BEM 变速器箱体辐射噪声的研究
王文平, 项昌乐, 刘辉
(北京理工大学车辆传动国家重点实验室,北京 100081)
摘要:采用有限元和边界元联合的方法对变速器箱体的辐射噪声进行分析研究。首先针对某型车辆变速箱
箱体,建立箱体与箱体内机油的流固耦合有限元模型和箱体的边界元模型,并分析其所受激励载荷;然后进行强迫
振动有限元的数值仿真计算,并通过试验进行验证,试验数据与仿真数据基本吻合;最后将振动的有限元计算结果
作为箱体边界元模型的边界条件进行噪声辐射的数值仿真计算。根据计算的结果,对该箱体的结构进行有针对性
的加筋强2化2,仿真计算的结果2表2明,进行加筋处理后的箱体噪声辐射能得到有效的抑制。
关键词:声学; 声辐射; 有限元; 边界元; 流固耦合
中图分类号: U463 文献标识码: A
Study on the Rad ia tion No ise of Gearbox Housing
Ba sed on FEM /BEM
WANG W en ping, X IAN G Chang le, L iu Hui
(National Key Laboratory of Vehicle Transm ission, Beijing Institute of Technology,
Beijing 100081, China)
Abstract: The radiation noise of gearbox housing is studied by the use bined the FEM and
BEM. The fluid structure coup ling finite element model and the boundary element model of p lex
gearbox housing are built based on the theory of fluid structure coup ling finite elementmethod and bound
ary element method. A t the same time the exciting forces of the housing are app lied to the models. First
ly, vibration of the housing is calculated by the fluid structure coup ling finite element model. Then the
calculated result is verified by the experiment. Finally sound radiation of the housing is calculated by the
boundary element. According to the calculated results,