PRÉVISION DU BRUIT ET DIAGNOSTIC VIBROACOUSTIQUE D'UN SYSTÈME COMPOSÉ D'UN ROTOR SUR DEUX PALIERS À ROULEMENTS

Abstract
This work is part of a study for sound prediction and vibroacoustic diagnosis of machine. We present the first experimental and theoretical results obtained for a testing bench composed of three supports (motor, rotor on bearing and reductor) to simulate such experimental defects as mesalignment, unbalancement, defective bearings and gears. These results concern more specifically the rotor on bearing support. The theoretical part is the calculation of pressure or acoustic power, from structure vibratory velocity measurement. The basis of the modelisation is a point source distribution on the structure area, located on a rigid ground, radiating in a semi-anechoic medium. The experimental part is the simulation of several real defects (angular and parallel mesalignment and unbalancement) and the measurement of the resulting acoustic power using intensimetry techniques and acoustic pressure. Theory experiment comparison are presented..