METHODE DE REDUCTION DES NIVEAUX VIBRATOIRES D'UNE ROUE AUBAGEE DE TURBOMACHINE.

摘要

#CMT# #/CMT# Initial configuration of the blades is defined. Synchronous forced response on one bladed wheel is calculated as a function of harmonic excitation force produced by another bladed wheel expressed in the form of a linear function of the generalized aerodynamic force for the mode considered. Geometric tangential shift value is determined for the stacked cross sections of one wheel to reduce the corresponding term to the generalized aerodynamic force. Set of cross sections with the tangential shifts defines a new configuration of the blades to be applied to one wheel. #CMT#USE : #/CMT# Method for reducing vibration levels in a turbomachine. #CMT#ADVANTAGE : #/CMT# The method controls vibration levels in a configuration where the bladed wheels are adjacent. It also controls vibration responses on a bladed wheel for perturbations whose origin is upstream or downstream of the bladed wheel without being limited to the adjacent wheels. Corrective measures are taken as early or as far upstream as possible in the process of designing and adjusting the bladed wheels of turbomachines. The method reduces vibration levels synchronous with the rotor's rotation speed on a moving or stationary bladed wheel generated by the relative movement of the wakes or of the distortion resulting from a bladed wheel that is adjacent or at one or two stages removed upstream or downstream. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows blade of a stationary bladed wheel.