Abstract
Subsynchronous vibration of centrifugal compressor is one of the important problems of rotating machinery. The stabilizing efforts in labyrinth seals and bearing are applied successfully; however, the destabilizing force from impeller could not be fully solved. Then, authors make a plan to solve this problem from the basic point of phenomenon. At first, the basic experimental model was developed to realize the subsynchronous vibration in laboratory. One is fiber reinforced plastics impeller which has relatively large diameter and very light weight, the other is very slender rotor which gives low natural frequency and very small damping.
