510 軸受部にクリアランスをもつロータの自励振動 : 横荷重に起因する自励振動の発生機構(不つりあい・自励振動,OS-4 ロータダイナミクス)

概要

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In the former report self-excited oscillation of forward whirling mode was observed in the vertical rotor system with radial clearance between bearing outer race and casing. In this paper the mechanism of the self-excited oscillation is clarified by considering phase delay of the bearing in the unbalance harmonic oscillation. Instability force of forward whirling is caused by the phase delay of the hearing to the disc. As the lateral force increases the phase delay and instability force above the major critical speed, the harmonic oscillation becomes unstable and the self-excited oscillation occurs. When the lateral force is nearly equal to the disc unbalance, the phase delay remains larger in the wide range above the main critical speed. Therefore, it is necessary to reduce the lateral force less than unbalance for suppressing the self-excited oscillation.
2004-09-27