Turbojet vibrations analysis using the order tracking methods

Abstract

Provided paper describes signal analysis of a turbojet focused on possible components failure or wear. Multiple accelerometers with additional instantaneous shaft speed measurement were utilized to measure vibrations. The experiment was carried out during the turbojet normal working conditions where the shaft speed run-up from zero to maximum speed about 800 rev/s where is kept about 15 s and then smoothly coasted-down towards zero. As many as short-time Fourier transform with addition of order tracking and Vold-Kalman filtration methods were used to examine the turbojet vibrations and point out to the problematic elements inside.