Forced Vibration of Turbojet Engine Rotor: Simultaneous Excitation of the 1^(st), 2^(nd) Compressor and Turbine Bladed Discs

R. Rzadkowski ； A. Maurin

《Proceedings of the 14th IFToMM World Congress》 14th-3 (2015/10) Pp. 695-704

https://doi.org/10.6567/IFToMM.14TH.WC.OS11.003

並列摘要

Considered here is the effect of multistage coupling on the dynamics of an aircraft engine rotor with eight mistuned bladed discs on a drum-disc shaft during foreign object ingestion (FOI). In the dynamic model, each disc had a different number of rotor blades. Free and forced vibrations were examined using the finite element models of single rotating blades, bladed discs, and an entire rotor. Calculations of the global rotating mode shapes of flexible mistuned bladed disc-shaft assemblies took into account simultaneous excitations of the first, second compressor and turbine bladed discs with 0EO, 1EO and 2EO forces. The thus obtained maximal stress values of all of the rotor blades were carefully examined and compared with a tuned system to discover resonance conditions and coupling effects. Our investigation has shown that mistuning changes the stress distribution in individual rotor blades and the level of maximum stress increases or decreases in relation to single or multiple bladed disc excitation.

並列關鍵字

multistage coupling ； mistuning ； blades ； bladed disc