Method of locating friction generating defects in a multiple bea

Details Method of locating friction generating defects in a multiple bea Method of locating friction generating defects in a multiple bea

1988-06-27

1989-08-08

Levy, Stewart J.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

374 4, 73120, G01M 1500, G01N 2572

Patent

active

048541621

ABSTRACT:
A method of determining the location and type of dimensional defects, particularly friction generating defects, which comprises: (a) initiating simulated operation at ambient conditions of an assembly having certain sliding or rolling contact surfaces; (b) sensing any change in the temperature of such assembly surrounding each certain sliding or rolling contact surfaces (i) with a resolution of 0.02-1.0 C.degree. (preferably 0.1-0.7 C.degree.) and (ii) during a time span of 2-10 seconds measured from such initiation to provide separated voltage signals for each location; (c) converting the signals to a digitized thermal map; and (d) comparing the sensed digitized thermal map with a reference digitized thermal map for such an assembly without defects operated during the same time span and adjusted to compensate for any differing thermal conditions. Any deviations detected by such comparison representing defects.

REFERENCES:
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patent: 3886912 (1975-06-01), Haglund
patent: 3921435 (1975-11-01), Howard
patent: 4109508 (1978-08-01), Fukuyama
patent: 4343182 (1982-10-01), Pompei
patent: 4730484 (1988-03-01), Olschefski
patent: 4733175 (1988-03-01), Levinson
NASA Tech Brief 69-10113, Jun. 1969.

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