转子临界转速实验与计算的对比分析

Test and calculation of critical speeds of a rotor

在建立转子实验台的基础上,用实验方法测量转子的一阶临界转速,并与理论计算所得值进行对比分析.利用LabVIEW软件对实验台编制数据采集分析软件,可以直接显示随着转速的变化转子振幅和相位的相应变化,当转子振幅和相位发生突变时,所对应转速便是转子临界转速.根据Prohl法(初参数法)计算转子临界转速,利用VB编写程序进行计算.结果显示,实验数据和理论值基本一致,说明采用此实验台可以准确测量转子临界转速,编制的Prohl法VB程序适用于计算临界转速.

The first-order critical speed of a rotor is obtained by experiment on a rotor experimental platform, and the result is compared with the predicted one obtained by Prohl technique. A data acquisition program is made by LabVIEW in order to gather signals of the rotor vibration and display signals in different forms. When the amplitude and phase of the rotor suddenly change, the corresponding speed is the critical speed. According to Prohl method, a program is written by VB in order to get the predicted value of the rotor critical speeds. The result shows that the tested data are almost consistent with the predicted ones.