Method and apparatus for determining rotor life expended

Details Method and apparatus for determining rotor life expended Method and apparatus for determining rotor life expended

1976-11-02

1977-09-06

Goldstein, Herbert

Measuring and testing

Test stand

For engine

73 154, G01N 300

Patent

active

040460029

ABSTRACT:
The useful life of a turbomachine part is affected by cyclic stresses which occur in the turbomachine part as a result of heating and cooling the turbomachine part. Each thermal cycle is comprised of a maximum heating stress and a maximum cooling stress which may occur during turbomachine start-up, load changes, shut-downs, or boiler excursions. The maximum heating stress and the maximum cooling stress for each cycle may be combined to define a stress range. The actual stress range for each cycle is compared with a calculated stress range curve for the turbomachine part to determine the amount of life expended during the cycle for the turbomachine part. This value may be expressed as a percent of life expended for the cycle. The life expended for each cycle is accumulated to provide an output indicative of the total percent life expended for the turbomachine part according to its operating history.

REFERENCES:
patent: 3250901 (1966-05-01), Brahm
patent: 3777555 (1973-12-01), Petrisko et al.
patent: 3832893 (1974-09-01), Dlugos
patent: 3908447 (1975-09-01), Salt
patent: 3950985 (1976-04-01), Buchwald et al.

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