Performance Testing on Transonic Rotors

Dynamic Performance of Magnetically Levitated Rotors

Magnetic bearings are selected as the physical systems because of the recent tremendous research activity in their use in high performance machines. The input-output characteristic makes such a system inherently nonlinear and unstable, so it is necessary to implement a desired control to it. However, if the system dynamic behavior and the limitations from the control system hardware as a whole ...

Psychoacoustic Testing of Modulated Blade Spacing for Main Rotors

Multihypothesis Testing Damage Diagnosis of Rotors : Application of Hilbert Transform

In this paper, a combined approach to damage diagnosis of rotors is proposed. The intention is to employ signal-based as well as model-based procedures for an improved detection of size and location of the damage. In the first step, Hilbert transform signal-processing techniques allow for a computation of the signal envelope and the instantaneous frequency, so that various types of nonlineariti...

Aeroacoustic Testing of Open Rotors at Very Small Scale

This study examines the potential of very-small-scale experiments to simulate the acoustics of large scale counter-rotating open rotors in isolation and with a rectangular-plate shield. The experimental rotor model was based on the historical F7/A7 design developed by General Electric. The 80-mm diameter rotors were fabricated using advanced stereolithography and were powered by two high-perfor...

Effect of aging and manufacturing tolerances on multi-stage transonic axial compressor performance

The Axial compressor is an integrated part of a gas turbine. The central part of compressors is its blades. Blade aerodynamic has a significant effect on compressor performance. Because of the adverse pressure gradient in the compressor, any deviation in the blade profile has a significant influence on the flow field as well as the compressor performance. During the manufacturing and operation ...