碰摩转子刚度增加现象的相位特征  

The phase characteristics of stiffness increase phenomena of rub-impact rotor

作　　者：徐洁琼[1] 王士敏[1] 王琪[1] 王楠[1] 

机构地区：[1]北京航空航天大学一般力学教研室,北京100191

出　　处：《振动与冲击》2010年第6期144-148,218,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(10672006;10672007)

摘　　要：研究了碰摩转子刚度增加现象的相位特征。转子与定子的全局碰摩在通过并远离临界转速后仍然可以持续。理论证明了发生稳态全局碰摩时,该现象具有确定的相位特征,即激励与响应的相位差随着转速的增加逐渐接近π/2。当激励与响应的相位差略微大于π/2后,相位突然转迁到接近π。此时,全局碰摩结束,振幅跳跃到非碰摩运动状态。结合解析和数值结果,解释了这一现象以及其物理机制,并对全局碰摩失稳后,系统运动状态的相位特征进行了初步探讨。The phase characteristics of stiffness increase phenomena of a rubbing rotor were investigated.It was assumed that the full annular contact will be maintained for a wide speed range even though the rotor has passed through its critical speed.It was verified that for stationary rub,the phase has an inherent characteristic,that is,the phase difference between the response and the excitation approaches to π/2 gradually along with the increase of rotor speed;the phase difference will jump to π after it exceeds π/2 with a small increment,and then non-rub motion starts.The analytically and numerical results explain the mechanism of stiffness increase.The phase characteristics of non-stationary rub motions after Hopf bifurcation was also numerically analyzed.

关 键 词：JEFFCOTT转子 全局摩擦 刚度增加 相位差 

分 类 号：O31[理学—一般力学与力学基础] O32[理学—力学]