Shaft torque measurement

Details Shaft torque measurement Shaft torque measurement

1990-07-13

1991-11-26

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

731173, G01L 310

Patent

active

050673556

ABSTRACT:
A method and apparatus for determining the power output of a gas turbine engine utilizes a speed sensor coupled to the engine shaft and a signal developed by a pyrometer coupled to the engine turbine for determining engine temperature. The speed sensor is normally provided in the engine for determining shaft speed and is part of the control system for the engine. The pyrometer is provided also as part of the control system to monitor gas turbine temperatures. A signal from the speed sensor derived from a toothed wheel passing adjacent the sensor is processed to obtain a train of pulse signals representative of angular rotation of the engine shaft. The pyrometer is mounted adjacent at least one of the turbine disks of the engine for detecting instantaneous temperature of each blade of the turbine disk as it passes by the pyrometer. The signal developed by the pyrometer is therefore a signal having peaks corresponding to passage of each blade at the pyrometer. A signal conditioning apparatus processes the signal from the pyrometer to develop a pulse train of shaped signals corresponding to the angular position of each turbine blade as it passes by the pyrometer. The system determines the relative phase difference between the signals developed by the speed sensor and the signals developed on the pyrometer under low load conditions and stores this information as a reference phase difference value. Phase differences under load conditions are thereafter compared to the reference value. The differences in phase are proportional to shaft twist and accordingly to shaft torque.

REFERENCES:
patent: 3538762 (1970-11-01), Parkinson et al.
patent: 3548649 (1970-12-01), Parkinson
patent: 4444064 (1984-04-01), Wolfinger
patent: 4774845 (1988-10-01), Barbe et al.
patent: 4875379 (1989-10-01), Rohs et al.

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