Abstract: In the process of constructing the digital twin geometric model of the rolling bearing,the mating surface of the model is often given an ideal smooth surface,lacking surface topography information,which results in poor consistency with the physical entity.To solve this problem,the fine modeling method of digital twin geometric model for rolling bearing was proposed.Based on the fractal theory,point cloud transformation and point cloud reconstruction technology,the fine digital twin geometric model of rolling bearing with surface topography features was constructed.The fine digital twin geometry model and smooth digital twin geometry model of rolling bearing were simulated respectively,and compared with the vibration data of rolling bearing collected by experiment in time-frequency domain parameters.The results showed that the fine digital twin geometry model of rolling bearing was more consistent with the actual operation situation than the traditional smooth geometry model.

Key words: digital twin, rolling bearing, fine modeling, fractal theory

摘要： 针对滚动轴承数字孪生几何模型构建过程中,因被赋予理想的光滑表面而缺乏表面形貌信息,导致模型配合面与物理实体一致性差的问题,提出滚动轴承数字孪生几何模型精细建模方法,基于分形理论、点云变换和点云重建技术构建了带有表面形貌特征的滚动轴承数字孪生精细几何模型。通过对滚动轴承的数字孪生精细几何模型和光滑几何模型进行仿真分析,并与实验采集的滚动轴承振动数据在时频域参数上进行对比验证,表明相比传统的光滑几何模型,滚动轴承的数字孪生精细几何模型更符合实际运行情况。

关键词: 数字孪生, 滚动轴承, 精细建模, 分形理论