Method of surge detection

Details Method of surge detection Method of surge detection

1994-02-22

1995-04-04

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

60 39161, 60 3929, F02C 916

Patent

active

054026326

ABSTRACT:
The double derivative of the gas generator shaft (16) is sensed and compared to upper and lower limits to determine breaches of these limits within a first predetermined time, in which case a first potential surge condition is declared. The derivative of torque, or the double derivative of shaft speed, of the power shaft (22) is sensed and compared to upper and lower limits to determine breaches of these limits within a second predetermined time, in which case a second potential surge condition is declared. If both a first and second potential surge condition is declared within a third predetermined time, an actual surge condition is declared.

REFERENCES:
patent: 3006144 (1961-10-01), Arnett et al.
patent: 3876326 (1975-04-01), Weitz
patent: 4117688 (1978-10-01), Elsaesser et al.
patent: 4430855 (1984-02-01), Deneux et al.
patent: 4449360 (1984-05-01), Evans
patent: 4756152 (1988-07-01), Krukoski
patent: 5051918 (1991-09-01), Parsons

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