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1 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

1 2006

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Free vibrations analysis of shrouded bladed discs with one loose blade

Rządkowski R., Kwapisz L., Drewczyński M., Szczepanik R., Rao J.S.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2006

Vol. 10, No 1

83-95

As a failure of rotor blades in a gas turbine was reported, the rotating-mode shapes of flexible shrouded bladed disc assemblies were calculated using a finite element approach. Rotational effects, such as centrifugal stiffening were accounted for, and all couplings between the flexible parts were allowed. The spin softening effects were neglected. A dynamic analysis of the shrouded bladed disc demonstrated that it was designed with a sufficient safety region of resonance. In case of one blade getting loose, it is vibrating in resonance.