Shaft crack detection method

Details Shaft crack detection method Shaft crack detection method

G - Physics

01

N

G01N 27/82 (2006.01) G01H 13/00 (2006.01) G01N 29/12 (2006.01) G01R 33/12 (2006.01)

Patent

CA 2044243

The presence of a crack in a shaft (42) is determined by comparing natural frequencies of the shaft (42) with an analytical model (62). From a multistation analytical model (62) of an uncracked shaft (42), natural frequencies and associated mode shapes are derived. A suspected axial location of a crack is defined, and a natural frequency is selected which has an associated mode shape exhibiting maximum deflection at the suspected axial location of the crack. The analytical model (62) is modified to include a representation of an asymmetric crack at the suspected crack location, and the predicted split and downward shift of the natural frequency is calculated from the modified model. The shaft (42) is subjected to a radial excitation force, and vibrational response measurements are taken with an accelerometer (76). A fast Fourier transform analyzer (78) derives a frequency response function from the measurements which indicate the natural frequencies of the shaft (42). These natural frequencies are compared with those predicted to determine the presence of a crack.

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