Method of recertifying a loaded bearing member using a phase poi

Details Method of recertifying a loaded bearing member using a phase poi Method of recertifying a loaded bearing member using a phase poi

1991-06-19

1993-08-17

Black, Thomas G.

Boots, shoes, and leggings

73761, 7386259, 36457103, G01H 100, G01N 2916

Patent

active

052375161

ABSTRACT:
A method of recertifying a load on a bearing member using a pulsed phase locked loop (P2L2) system. A first tone burst signal with a corresponding first phase signal is generated in the bearing member in a first load condition. The sample/hold of the P2L2 is adjusted to a determined phase point on the first phase signal and then the P2L2 is locked at this phase period to determine a first load measurement. Next, the phase sample point is correlated with a corresponding position w on the first tone burst signal. A second tone burst with a corresponding second phase signal is then generated at some later time in the bearing member in a second load condition. The sample/hold is adjusted to the same sample/hold phase point as before and then the output frequency of the P2L2 is adjusted until the sample/hold is positioned at the previously determined phase point corresponding to position w on the second tone burst signal. The P2L2 is then locked at this phase point to determine a frequency indicative of the load of the second loading condition.

REFERENCES:
patent: 3822587 (1974-07-01), Makino et al.
patent: 4363242 (1982-12-01), Heyman

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