DETC2011-47534 OPTIMIZATION OF THE SPECTRAL KURTOSIS FOR HARMONIC COMPONENT DETECTION

Jean-Luc Dion (1) , Gaël Chevallier (2, 1) , Nicolas Peyret (3, 1) , Franck Renaud (3, 4, 1) , Hugo Festjens (1)

1 LISMMA - Laboratoire d'Ingénierie des Systèmes Mécaniques et des MAtériaux
2 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)
3 QUARTZ - Laboratoire QUARTZ
4 SUPMECA - SUPMECA - Institut supérieur de mécanique de Paris

This work is a contribution in the field of Operational Modal Analysis to identify the modal parameters of mechanical structures using only measured responses. The study deals with structural responses coupled with harmonic components amplitude and frequency modulated in a short range, a common combination for mechanical systems with engines and other rotating machines in operation. These harmonic components generate misleading data interpreted erroneously by the classical methods used in OMA. The present work attempts to differentiate maxima in spectra stemming from harmonic components and structural modes. The detection method proposed is based on the so-called Optimized Spectral Kurtosis and compared with others definitions of Spectral Kurtosis described in the literature. After a parametric optimization of the method, a critical study is performed on numerical simulations and then on an experimental structure in operation in order to assess the method's performance.

Mots clés: operational modal analysis; kurtosis; spectral kurtosis; detection

Domaines: Vibrations [physics.class-ph]

Jean-Luc Dion, Gaël Chevallier, Nicolas Peyret, Franck Renaud, Hugo Festjens. DETC2011-47534 OPTIMIZATION OF THE SPECTRAL KURTOSIS FOR HARMONIC COMPONENT DETECTION. ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2011, Aug 2011, Washington, United States. ⟨hal-03539544⟩