Abstract:

In connection with the design of transfer case,a design method was proposed combined FEA with modal experiment for transfer case herein.Firstly,the modal experiments of transfer case was done by combing the modal experiment with FEA,and the accuracy of the model was verified;secondly,according to the established model of transfer case,the force rolled in transfer case's bearing in different working conditions were analyzed by using Romax software,thus the boundary conditions became more accurate,and then the statics and fatigue analysis were analyzed accurately.The case study shows that:in extreme conditions the maximum stress is as 196.8MPa;it is beyond the allowable stress of  the material.So the transfer was improved,through comparative analysis,and the stress and displacements of modal are reduced significantly after improvement,and it meets the design requirements. 

Key words: 4WD, transfer case, mode experiment, finite element analysis(FEA)

摘要：

基于有限元分析和模态试验方法进行了智能四驱车辆分动器设计分析。首先将模态试验和有限元分析相结合,进行了分动器的模态
试验,并验证了模型的准确性;接着基于建立的分动器模型,利用Romax软件进行了不同工况下分动器壳体的轴承受力分析,加载更为精确的边界条件,进行了准确的分动器壳体的静力学和疲劳分析。实例分析结果表明,该款分动器在极限工况时的最大主应力达到196.8MPa,超出了材料的许用应力。对分动器结构进行了改进,通过改进前后的对照分析,发现改进后模型的应力和位移量明显减小,符合设计要求。

关键词: 四驱汽车, 分动器, 模态试验, 有限元分析