摘要：Vibration characteristics of a structure on which unbalanced rigid rotors are operated are investigated experimentally and analytically. Rotor speeds cannot exceed a critical speed when drive power to each rotor is insufficient. Furthermore, the running speeds of rotors are entrained into a single speed just below the critical speed and the phases of unbalanced rotors are locked so as to excite the structure violently. On the other hand, two or three rotors operated by sufficient power supplies can run above the critical speed and unbalance forces cancel each other, that is, vibration is very small. When four rotors are operated with sufficient power supplies, the phases of unbalanced rotors are not locked for speeds above a critical speed.
关键词：Rotating Machinery;Passing Through Critical Speed;Unbalanced Rotor;Limited Power Supply;Transient Vibration;Synchronization
