DAMAGE DIAGNOSTIC METHOD FOR ROTATING BODY AND DAMAGE DIAGNOSTIC DEVICE FOR ROTATING BODY

摘要

PROBLEM TO BE SOLVED: To provide a damage diagnostic method for a rotating body, capable of detecting the presence/absence of the crack of a rotor and also specifying the position of the crack without disassembling a rotary machine.;SOLUTION: The displacement amount in the gravity direction of the rotor when the rotor is rotated once is measured at two or more parts in the axial direction of the rotor, a difference displacement amount for which the minimum value of the data of the displacement amount is subtracted from the data of the measured displacement amount is obtained, and the relation of the difference displacement amount to the rotation angle of the rotor and the relation of the maximum value of the difference displacement amount to the distance in the axial direction of the rotor are obtained. A crack position in the circumferential direction of the rotor is specified from the rotation angle of the rotor for maximizing the difference displacement amount in the relation of the difference displacement amount to the rotation angle of the rotor, and a crack position in the axial direction of the rotor is specified from the distance in the axial direction of the rotor for maximizing the maximum value of the difference displacement amount in the relation of the maximum value of the difference displacement amount to the distance in the axial direction of the rotor.;COPYRIGHT: (C)2012,JPO&INPIT