Method and apparatus for testing cyclically operated mechanical

Details Method and apparatus for testing cyclically operated mechanical Method and apparatus for testing cyclically operated mechanical

1978-10-06

1980-07-22

Ciarlante, Anthony V.

Measuring and testing

Vibration

Sensing apparatus

G01N 2904

Patent

active

042133467

ABSTRACT:
A method for testing cyclically operated mechanical members for defects comprises the steps as follows: a frequency range of at least two wideband electrical signals corresponding to the defects of the test member is selected; the modulus and phase of the resultant electrical signals is determined and the magnitude is accumulated using the value of the phase of that signal within a given number of rotational cycles of the test member; defect locations are determined using the maximal accumulated magnitudes of the resultant electrical signal and their corresponding phases. An apparatus to realize the disclosed method comprises at least two vibration pickups adapted to sense the vibration of the test member and coupled to the inputs of adjustable pass band filters which are operated to select a frequency range corresponding to the defects of the test member. The outputs of the filters are coupled to the inputs of a resultant electrical signal magnitude computing unit which is coupled to the input of a summing analyzer. The latter has another input coupled to a resultant electrical signal phase detector. There are also two position pickups adapted to determined the position of the test member and coupled to the resultant electrical signal phase detector.

REFERENCES:
patent: 3012434 (1961-12-01), Wehof
patent: 3699806 (1972-10-01), Weichbrodt
patent: 3731526 (1973-05-01), Games
patent: 3783680 (1974-01-01), Mason

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