Structure comprising a rotor and fixed perturbation sources...

Details Structure comprising a rotor and fixed perturbation sources... Structure comprising a rotor and fixed perturbation sources...

2006-04-18

2006-04-18

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S119000, C415S183000, C416S203000

Reexamination Certificate

active

07029227

ABSTRACT:
A method of reducing vibration in a structure comprising at least one rotor (101j) and a fixed set of sources of disturbance (102j) liable to give rise to disturbances in the fluid flow (11) that cause the rotor to vibrate, the method comprising a step of distributing the fixed sources of disturbance angularly in non-uniform manner so as to reduce the amplitude of excitation as seen by the rotor, and a step which consists in verifying that the maximum amplitude of a response of the rotor to the excitation is obtained by:determining a first signal whose Fourier transform corresponds to the frequency spectrum of the excitation in the event of the fixed sources of disturbance being distributed in a predetermined angular distribution;by modifying the first signal into a second signal adapted to said selected angular distribution for the fixed sources of disturbance;by determining the frequency spectrum of the excitation by calculating the Fourier transform of the second signal; andby calculating the response of the rotor to the excitation on the basis of the frequency spectrum of the excitation.

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patent: 2 617 914 (1989-01-01), None

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