Method and apparatus for detecting abnormal metal-to-metal conta

Details Method and apparatus for detecting abnormal metal-to-metal conta Method and apparatus for detecting abnormal metal-to-metal conta

1982-02-08

1984-07-17

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340589, G08B 2100

Patent

active

044608934

ABSTRACT:
This invention provides a method and apparatus for early detection of wiping contact between a rotating shaft and bearing metal in a flow lubricated bearing. In one form of the invention, a temperature sensor is provided to monitor bearing temperature at a location on the bearing in proximity to the maximum loading position. The sensor signal is sampled periodically by a plurality of sample and hold circuits so that present and immediately past values of the bearing temperature are always on hand. The sampled values are applied to a set of subtracters, each one of which provides a signal representing the difference between two consecutively sampled temperature values. Selected ones of the temperature differences are applied to summers and the largest sum is selected by a high-value selector and compared with a preselected setpoint value representing an excessive temperature change for a given time period. Based on the comparison, a decision is automatically made as to whether the bearing temperature at the sensed location is increasing at an excessively rapid rate, found to be indicative of a temperature "spike" which in turn is evidence of metal-to-metal contact in the bearing.

REFERENCES:
patent: 3582928 (1971-06-01), Gaertner
patent: 4406169 (1983-09-01), Ikeuchi et al.

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