Helicopter gearbox vibrations: cyclostationary analysis or bilinear approach?

Author

Bouillaut, Laurent ; Sidahmed, Ménad

Author_Institution

Lab. Heudiasyc, Centre de Recherche de Royallieu, Compiegne, France

Volume

1

fYear

2001

fDate

2001

Firstpage

367

Abstract

We show that a nonstationary approach can be preferred to a nonlinear one for the study of some nonlinear phenomena. We prove that the spectral correlation could detect and determine precisely a nonlinear phenomenon. Moreover, in terms of diagnosis on helicopter gearboxes (known for their strong nonlinearity), this tool is much more efficient than the bispectrum. Finally, we introduce an algorithm determining the main nature of a nonlinear cyclic phenomenon. This process is based on the use of higher order cyclic statistics

Keywords

correlation methods; helicopters; higher order statistics; signal processing; spectral analysis; vibrations; bilinear approach; bispectrum; cyclostationary analysis; gearbox vibrations; helicopter gearboxes; higher order cyclic statistics; nonlinear cyclic phenomenon; nonstationary approach; spectral correlation; Aircraft; Frequency estimation; Helicopters; Higher order statistics; Laboratories; Linearity; Rotating machines; Signal processing; Statistical analysis; Torque;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing and its Applications, Sixth International, Symposium on. 2001

Conference_Location

Kuala Lumpur

Print_ISBN

0-7803-6703-0

Type

conf

DOI

10.1109/ISSPA.2001.949854

Filename

949854