挠性转子系统的不平衡量在线识别方法

On-line unbalance identification of flexible rotor system

基于模态理论,针对滑动轴承支撑的挠性转子系统,提出了一种新的不平衡量在线识别方法.电磁激振器安装在转子的伸出端,产生脉冲激励力或不同频率的简谐激励力.通过测量转子的原始不平衡量响应和激励响应,计算出滑动轴承的刚度和阻尼系数及转子的不平衡量.在由滑动轴承支撑的多圆盘挠性转子试验台上进行了试验研究,结果表明该方法无需改变转子的工作转速,且能在支承系统没有转速变化的条件下满足全速动平衡的要求,同时具有良好的识别精度.

Based on the model theory and with the use of electromagnetic exciter (EA), a new imbalance identification technique for flexible rotor supported by fluid bearings was presented. EA mounted on the either end of rotor shaft can generate impulse excitation force or simple harmonic excitation force with different frequency. By measuring both original unbalance response and excitation response, dynamic stiffness and damping coefficients of fluid bearings and rotor unbalances can be calculated. With this method the trial runs of the rotor are avoided. The rotor may be good balanced in all interesting range of rotating speed by identification results even the support parameters change with the rotating speed. Experimental results show that the identification precision is satisfactory.