滚动轴承有限元动力学模拟中的刚体简化问题研究

摘要

The finite element dynamic analysis model of NF209 cylindrical roller bearing was established.Further,the influence of different simplification methods on calculation accuracy and calculation time was studied.The results show that modeling the rollers as rigid bodies has a great impact on calculation precision while setting the inner ring,outer ring or cage as a rigid body has less influence on the calculation precision.Computation time has the greatest reduction if rollers are treated as rigid bodies,followed by the cage,outer ring and inner ring.The research results can provide a reference for the simplification of the finite element models of bearings.%以NF209圆柱滚子轴承为对象,建立轴承的有限元动力学分析模型,研究不同刚体简化方法对模型计算精度及计算时间的影响规律.研究结果表明:将滚柱简化为刚体对有限元模型的计算精度有较大影响;将内圈、外圈以及保持架分别简化为刚体对模型的计算精度影响并不是很大;将滚柱简化为刚体对于减少有限元模型的计算时间效果最好,保持架及外圈效果次之,内圈效果最差.研究结论可以为选用有限元轴承模型的简化方案提供参考.