CRACK DETECTING SYSTEM OF ROTATION MACHINE AND DIAGNOSING METHOD OF THE SAME

摘要

PURPOSE: A crack detecting system of rotation machine and diagnosing method of the same is provided to perform a precise crack diagnosis from a signal analyzer using a complex modal testing method. CONSTITUTION: The crack detecting system detecting a crack(21) generated in a rotation body(11, 21) includes a signal analyzer(100). The signal analyzer comprises an excitation section(210, 211) providing an exciting force for exciting the rotation body(11), a measurement section(130, 140, 220) measuring an angle information and a response and the exciting force of the rotation body excited by the excitation section, a random signal generator(108) providing the excitation signal to the excitation section, a fourier transform section(102, 103) fourier transforming the input signal to the measurement section, a directional frequency response function(dFRF,) section(101) obtaining a result of a reverse dFRF for the crack diagnosis of the rotation body. An alarming system comparing the calculated resultant with the set critical value and alarming is formed in the signal analyzer and the dFRF.