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

• Autorzy: Bouillaut L. , Sidahmed M.
• Konferencja: 19th IMEKO TC-10 International Conference on Technical Diagnostics. Integration in Technical Diagnostics (22-24.09.1999 ; Wrocław)
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

cyclostationary; bilinear; spectral correlation; bispectrum; early diagnosis; vibrating signals

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje
• Rocznik: 1999
• Tom: Vol. 86, nr 24
• Strony: 93--102
• Opis fizyczny: Bibliogr. 12 poz., rys. 9

Twórcy

autor

Bouillaut L.

autor

Sidahmed M.

• Universite de Technologie de Compiegne, Centr de rechrche de Royallieu, 60205 COMPIEGNE FRANCE