摘要
根据不平衡磁拉力作用机理,在电主轴动力学建模时将其等效为具有"负刚度"的支承元件;基于传递矩阵法建立计及不平衡磁拉力的高速空气静压电主轴的动力学模型,利用MATLAB7.0软件对最高工作转速为25×104r/min空气静压高速电主轴动力学特性进行计算。结果表明:计入磁拉力后电主轴的前3阶临界转速有一定程度的降低,且该电主轴工作转速远远高于1阶临界转速,属于挠性轴范畴。可以看出:1阶振型脆弱点在主轴前端,2阶振型脆弱点在主轴前端和转子轴段。
According to the analysis of mechanism of unbalanced magnetic pull（ UMP）,UMP was equivalent to the support element with ＂negative stiffness＂during dynamics analysis of the motorized spindle. Based on the transfer matrix method,the dynamic model for high speed motorized spindle with the externally pressurized gas bearing was constructed by considering unbalanced magnetic pull. And taking high speed motorized spindle with the externally pressurized gas bearing as an object,Dynamics characteristic was calculated and simulated by using MATLAB7. 0software. The results showed that first three modes critical speed of motorized spindle considering unbalanced magnetic pull was reduced to a certain degree,and the spindle speed was much higher than the first-mode critical speed,which belonged to the flexible spindle.
出处
《机械科学与技术》
CSCD
北大核心
2014年第6期792-795,共4页
Mechanical Science and Technology for Aerospace Engineering
基金
国家科技支撑计划项目(2012BAF12B14)资助
关键词
高速电主轴
传递矩阵法
动力学分析
不平衡磁拉力
bearings
calculations
computer simulation
dynamics
MATLAB
models
transfer matrix method
