郑州大学学报（工学版）2024，Vol.45Issue(5)：23-29,7.DOI:10.13705/j.issn.1671-6833.2024.05.007
CT机双列角接触球转盘轴承建模与振动特性分析
Modeling and Vibration Characteristics Analysis of Double-row Angular Contact Ball Turntable Bearings in CT Machine
摘要
Abstract
In order to improve the running characteristics of the main bearing of the CT machine and ensure the sta-bility of the medical imaging of the CT machine,the double-row angular contact ball turntable bearing developed by Luoyang LYC Bearing Co.,Ltd.was used as the research object for modeling and vibration characteristic analysis.Firstly,based on Hertz's contact theory,the mechanical model of the bearing with the action of composite load was established.Then the nonlinear dynamic differential equation of the bearing outer ring with 3 degrees of freedom was established in combination with Newton's law of motion.Finally the differential equation system was solved by the fourth-order Runge-Kutta method to obtain the vibration characteristics of the bearing outer ring.On this basis,by analyzing the factors affecting the vibration characteristics of the bearing,such as the radius coefficient of curva-ture of the groove in the inner and outer rings of the bearing,the number of rolling elements,the clearance,the preload,etc.,the optimal structural parameters to meet the low vibration of the main bearing of the CT machine were determined.The results show that the vibration amplitude of the bearing decreases first and then increases with the increase of the radius coefficient of curvature of the inner and outer ring grooves,which were controlled at 0.515 to 0.525,respectively.The range of 0.510 to 0.525 was more conducive to reducing the vibration of the bearing.With the increase of the number of rolling elements,the vibration amplitude of the bearing also increases,but the change was stable,so the vibration of the bearing can be reduced by reducing the number of rolling ele-ments under the premise of satisfying the design conditions.With the increase of the bearing clearance,the vibra-tion amplitude of the bearing decreases first and then increases sharply,and the vibration reaches the minimum at 18 μm.Appropriate axial load can effectively reduce the vibration amplitude of the bearing.关键词
CT机/力学模型/振动模型/结构参数/振动加速度Key words
CT machine/mechanical model/vibration model/structural parameter/vibration acceleration分类
机械制造引用本文复制引用
袁峰,刘凌仲,秦东晨,陈江义,谢兴会..CT机双列角接触球转盘轴承建模与振动特性分析[J].郑州大学学报（工学版）,2024,45(5):23-29,7.基金项目
国家重点研发计划项目(2018YFB20005-01) （2018YFB20005-01）
河南省重大科技专项(221100220100) （221100220100）
