| || Vibration Characteristics of Aircraft Engine Bladed Disk Assembly
Author : Rao, J.S.;Shah, C.B.;Ganesh, L.;Rao, Y.V.K.S.
Source : Defence Science Journal ; Vol:36(1) ; 1986 ; pp 9-26
Subject : 629.7 Aeronautics
Keywords : Gas-turbine;Orpheus aircraft engine;Aircraft engine;Vibration exciter
Abstract : This paper is concerned with the vibration characteristics of a gas-turbine blade-disk assembly and a third stage of compressor blade-disk assembly of an orpheus aircraft engine. The assembly is analyzed by considering each component individually and then combining them together with a receptance coupling technique by matching forces and displacements at each junction point. The blade is modelled by number of free-free aerofoil section beams staggered at different angles to the plane of the disk, and the non-uniform disk is modelled as number of concentric annuli. The natural frequencies and mode shapes for each case have been obtained. Results obtained are verified by testing both the above assemblies of a microprocessor based vibration exciter and real time analyzer. The mode shape corresponding to each natural frequency was obtained by probing with hand held accelerometer.