基于CAE／CAT／CAO的齿轮箱轴承结合部等效刚度识别方法

摘要

基于CAE／CAT／CAO技术，提出一种有限元模态分析、试验模态分析与Isight集成优化方法相结合的精确识别轴承结合部等效刚度的方法：①采用Abaqus有限元分析软件建立齿轮箱有限元分析模型，通过spring单元模拟轴承三个方向的等效刚度，并将其作为设计变量；②基于LMS模态测试分析系统对齿轮箱进行试验模态分析，得到包含轴承结合部信息的各阶固有频率和振型，并以试验模态分析得到的固有频率值作为优化目标值；③通过Isight软件集成Abaqus对轴承刚度进行寻优，使有限元模态分析的结果与试验模态分析的结果相一致。分析结果表明，该方法综合考虑了齿轮轴、箱体的柔性，具有较高的精度，优化后的齿轮箱有限元模型与试验模型动态性能一致性好。%Based on CAE/CAT/CAO technology,a method to identify bearing stiffness of a gearbox was proposed with the combination of finite element modal analysis,experimental modal analysis and Integrated optimization of isight. Firstly,the finite element analysis model of a gearbox was built with the finite element analysis software Abaqus,and a spring element was used to simulate the equivalent stiffnesses of the bearing in 3 directions,they were taken as design variables.Secondly,the natural frequencies and vibration modal shapes containing information of bearing joint interfaces were acquired with the experimental modal analysis of the gearbox using LMS modal test and analysis system,and the natural frequencies acquired from tests were taken as the optimal objective values.Finally,the results of finite element modal analysis and those of experimental modal analysis were made to be in consistent through optimization of bearing stiffnesses using Abaqus combined with integrated Isight.Analysis results showed that the proposed method considers the flexibility of gear shaft and gear box,it has a higher precision,and there is a good agreement between the dynamic performances of the finite element model of the gearbox after optimization and those of the test model.