高速电主轴转子轴承系统动力学特性分析  

Dynamic characteristics analysis of rotor-bearing system for high speed motorized spindle

作　　者：高峰[1,2] 贾伟涛 李艳[1,2] GAO Feng;JIA Weitao;LI Yan(Key Laboratory of NC Machine Tools and Integrated Manufacturing Equipment of the Ministry of Education,Xi’an University of Technology,Xi’an 710048,China;Key Laboratory of Manufacturing Equipment of Shaanxi Province,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学教育部数控机床及机械制造装备集成重点实验室,陕西西安710048 [2]西安理工大学陕西省制造装备重点实验室,陕西西安710048

出　　处：《西安理工大学学报》2021年第1期57-63,共7页Journal of Xi'an University of Technology

基　　金：陕西省重点研发计划资助项目(2018ZDXM-GY-074)。

摘　　要：为了预测高速电主轴转子轴承系统的动力学行为,本文以150MD25Z7.5高速电主轴转子轴承系统为研究对象,考虑质量偏心及“负刚度”效应,建立转子轴承系统动力学模型。运用Runge-Kutta法及稳定性理论,分析了系统动力学响应及不动点处的局部稳定性。结果表明:①转速的增加,系统振幅逐渐增大,且系统表现出复杂的动力学行为。②轴承刚度的增加,系统振幅呈现下降的趋势,且系统始终处于周期运动。③根据稳定性理论,系统在固定点(±1,0)附近,是失稳的,在固定点(0,0)附近,是渐近稳定的。Taking the rotor-bearing system of 150MD25Z7.5 high-speed motorized spindle as the research object,the dynamic model rotor-bearing system is established considering mass eccentricity and “negative stiffness”effect to predict the dynamic behavior of rotor-bearing system for high-speed motorized spindle.The dynamic response and the local stability at the fixed point of the system are analyzed by using Runge-Kutta method and stability theory respectively.The results show that the amplitude of the system increases gradually with the increase of rotating speed,and the system complex dynamic behavior.With the increase of bearing stiffness,the amplitude of the system decreases and the system is always in periodic motion.Based on the stability theory,the system is unstable near the fixed point(±1,0),and asymptotically stable near the fixed point(0,0).

关 键 词：高速电主轴 非线性行为 稳定性分析 

分 类 号：TH113[机械工程—机械设计及理论]