该判据用永久转动角速度的大小而不是进动角速度的大小作为判别准则，较为合理。
This criterion is reasonable because it is not expressed in terms of the precessional velocity, but the angular velocity of the permanent rotation.
振幅、相位、进动角速度在过临界后的波动频率随转速增加而增加。
The minimum and maximum of amplitude fluctuation correspond with the minimum of precession speed after the critical point on the response curve.
在设计点附近作了沿叶高效率分布及动叶进、出口速度三角形的测定。
The efficiency distribution along blade span and the inlet and outlet velocity triangle measurement of rotor blades were made around the designing point.
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