摘要
目的研究全陶瓷电主轴预紧力与固有频率的关系,为优化预紧力提供软件分析模型.方法应用赫兹理论计算出在全陶瓷角接触球轴承预紧后的接触应力,接触变形和静接触刚度的数值解,同时在改进传统的弹簧阻尼式主轴动力学软件仿真分析模型的基础上,计及轴承预紧后轴承的静接触刚度,以全陶瓷主轴-轴承单元为研究对象进行有限元结构分析,所得结果通过赫兹计算分析的数值解矫正,分析其动力学特性.结果全陶瓷主轴-轴承单元模型通过模态分析所得三阶固有频率和振型与模态实验分别相差19.59%、1.27%、16.06%;而电主轴传统分析模型所得三阶固有频率和振型与锤击实验分别相差24.39%、14.47%、33.78%.结论通过实验数据验证,全陶瓷主轴-轴承单元模型在分析全陶瓷电主轴动力学特性上更接近模态实验的结果,能够得到更为准确的固有频率和振型.
In order to get more accurate natural frequencies and vibration modes of fullceramic motorized spindle, and also for the purpose of providing a software analysis model for further re searching, optimizing of preloads, contact pressures, deformations and static contact stiffness of the fullceramic angel contact ball bearing were numerically calculated by the Hertz theory. Based on the improvement for traditional springdamper spindle dynamics software simulation model ,taking into account of the static contact stiffness of bearings after preload, a simulation model of the full ceramic spindlebearing unit was built and analyzed with FE method. Results were verified by nu merical solutions of Hertz Theory. It is found that in comparison with modal experiments, the errors of the obtained three national frequencies of the fullceramic spindlebearing unit model are 19.59%, 1.27% and 16.06% ,respectively. The errors of the traditional springdamper spindle a nalysis model are 24.39%, 14. 47% and 33.78%. It is apparent that the former is closer to the modal experimental data than the latter. Conclusion is that the analyzed mechanical performances of fullceramic spindle with the fullceramic spindlebeating unit model are more approximate to the results of modal experiments. With the proposed model, more accurate natural frequencies of fullceramic motorized spindle can be obtained.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2015年第1期140-148,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51375317)
辽宁高等院校优秀人才项目(LJQ2011058)
住房和城乡建设部科技攻关项目(2010-K8-11)
辽宁省教育厅科学技术研究项目(L2012215)
教育部创新团队计划项目(IRT1160)
关键词
全陶瓷主轴-轴承单元
动力学
固有频率
模态实验
full-ceramic spindle-bearing unit
dynamic
natural frequency
modal experiment
