Numéro : 2071 - Year : 1988

Comparison of two spectral methods applied to the analysis of drag forces acting on a vibrating cylinder in a subcritical flow

D.RAJAONA, Docteur ès Sciences, Ingénieur de Recherches,
P. SULMONT, Docteur ès Sciences, Professeur,
A.BARBARESCO, Ingénieur, au Laboratoire d'Hydrodynamique Navale à l'Ecole Nationale Supérieure de Mécanique (ENSM) à Nantes.

Two spectral methods applied to the analysis of the drag forces acting on a vibrating cylinder are presented. The advantages and the drawbacks of each method -that is non parametric ( using discrete Fourier transform coupled with spectral Interpolation) or parametric (working in time domain)-are discussed. The results of the analysis on a theoretical signal are compared and the parametric method Is applied to the calculation of the dominant frequencies of the fluctuating forces acting on a vibrating circular cylinder .

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