F - Mech Eng,Light,Heat,Weapons – 01 – D
Patent
F - Mech Eng,Light,Heat,Weapons
01
D
F01D 5/10 (2006.01) F04D 29/66 (2006.01) F16F 15/20 (2006.01)
Patent
CA 2446590
The invention relates to a method for reducing vibrations in a structure comprising at least one rotor (101j) and a set of fixed perturbation sources (102j) that can produce perturbations in the fluid flow (11) thereby causing the rotor to vibrate. The inventive method comprises a step involving the non-uniform angular distribution of the fixed perturbation sources in such a way as to reduce the amplitude of the excitation experienced by the rotor and a step consisting in verifying that the maximum amplitude of the response of the rotor to the excitation is obtained, by: determining a first signal for which the Fourier transform corresponds to the excitation frequency spectrum when the fixed perturbation sources are distributed along a predetermined angular distribution; modifying the first signal into a second signal, which is adapted to said angular distribution selected for the fixed perturbation sources; determining the excitation frequency spectrum by calculating the Fourier transform of the second signal; and calculating the response of the rotor to the excitation on the basis of the excitation frequency spectrum.
Procédé de réduction de vibrations dans une structure comprenant au moins un rotor (101j) et un ensemble de sources de perturbation fixes (102j) susceptibles d'entraîner des perturbations dans l'écoulement de fluide (11) faisant vibrer le rotor, procédé comprenant une étape de répartition angulaire non uniforme des sources de perturbation fixes de telle façon à réduire l'amplitude d'une excitation vue par le rotor et une étape consistant à vérifier que l'amplitude maximale d'une réponse du rotor à l'excitation est obtenue en: déterminant un premier signal dont la transformée de Fourier correspond au spectre fréquentiel de l'excitation dans le cas où les sources de perturbation fixes sont réparties selon une répartition angulaire prédéterminée, en modifiant le premier signal en un second signal, adapté à ladite répartition angulaire choisie des sources de perturbation fixes, en déterminant le spectre fréquentiel de l'excitation en calculant la transformée de Fourier du second signal, et en calculant la réponse du rotor à l'excitation sur la base du spectre fréquentiel de l'excitation.
Berthillier Marc
Cloarec Yvon
Seinturier Eric
Goudreau Gage Dubuc
Snecma
Snecma Moteurs
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