System and method for detecting the occurrence, location and dep

Details System and method for detecting the occurrence, location and dep System and method for detecting the occurrence, location and dep

1987-07-22

1993-11-02

Black, Thomas G.

Boots, shoes, and leggings

364562, 364582, 73579, 340683, G01M 700

Patent

active

052589234

ABSTRACT:
System and method for detecting the occurrence, location and depth of a crack in the rotor of a turbine-generator. The location and depth of a crack are determined by monitoring the fundamental and histogram harmonic components of vibrations at certain predetermined points along the length of the rotor. The histogram harmonic components are normalized relative to the fundamental component, and the normalized histogram harmonic components are monitored to determine the location of the crack. The unnormalized histogram harmonic components are analyzed to determine the depth of the crack. The occurrence of a crack is detected by monitoring the amplitude and phase of rotor vibrations during an accel or decel operation to detect harmonic resonances which are characteristic of a crack in the rotor. The amplitude and phase data is filtered to eliminate spurious data, and it is interpolated to provide baseline and current data at matching speed points.

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