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1 Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje

1 1999

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Cyclostationary and bilinear approaches for gears vibrating signals application to helicopter gear box diagnosis

Bouillaut L., Sidahmed M.

Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje

1999

Vol. 86, nr 24

93-102

Our study first deals a comparison between cyclostationarity and bilinearity, and then with different applications of these approaches. Using synthetic and indudtrial signals, we underline that cyclostationarity tools make it possible to determine non-linear links between two frequencies (Quadratic Phase Coupling). Then , we present different applications of cyclostationarity and bilinearity to helicopter noise. These methods enable us to obtain much more interesting results than classical methods such as Fourier, Spectrum, time-frequency studies. First, these techniques allow us to detect and to determine precisely a fault on the system. Moreover, the PSD presents a frequency which is not linked to any physical property of the engine. A cyclostationary study makes it possible to explain precisely the apparition of the frequency. Finally, we underlined a unusual modulation phenomenon. Usually, during a meshing phenomenon, the rotating frequency modulaters the meshing frequency; this is characterised by a spectrum with lateral bands around meshing harmonics. Here we encountered a meshing frequency which modulated another meshing frequency.