Patent ID: 6705168
Filing Date: 2004-03-16
Classification: G01N

Abstract:
Method for processing measurements of the vibration of a bearing block (5) or a rotor (2) of a rotating machine (3) comprising:using a record of at least one pair of two series of measurements x(t) and y(t) made using at least one pair of two position sensors (10, 11) placed relative to the bearing block (5) or the rotor (2) and arranged approximately in the same plane (P) and with two approximately orthogonal measurement directions X and Y, calculating a DFT (Discrete Fourier Transform) of each of the two series x(t) and y(t) to obtain a spectral decomposition of the series x(t) and y(t) in amplitude and phase according to two series of amplitude-phase pairs [Ax(fi), &PHgr;x(fi)] and [Ay(fi), &PHgr;y(fi)] where fi corresponds to frequency values distributed on the frequency spectrum, characterized in that it also comprises: starting from spectral decompositions [Ax(fi), &PHgr;x(fi)] and [Ay(fi), &PHgr;y(fi)], calculating a spectral decomposition in elementary elliptical trajectories of the displacement of the rotor axis, defined by a series of sets of at least three data [Emax(fi), Emin(fi), E&phgr;(fi)] where: Emax(fi) is the maximum radius of the elementary ellipse at frequency fi, Emin(fi) is the minimum radius of the elementary ellipse at frequency fi, E&phgr;(fi) corresponds to the value of the orientation angle of the principal axis of the elementary ellipse, and may be positive or negative depending on the direction of movement around the ellipse, Save the series [Emax(fi), Emin(fi), E&phgr;(fi)].