Abstract: Systems and methods for regulating fuel flow to a gas turbine engine are provided. Power for the engine is governed using a control structure having an inner control loop and an outer control loop, the outer control loop comprising a feedback controller that outputs a feedback command based on a power error determined as a function of a shaft horsepower, the feedback command used to determine a gas generator speed error, the gas generator speed error used by the inner control loop for outputting a fuel flow command. The shaft horsepower is determined from a torque measurement of the engine using a torque pressure transducer. When a momentary loss of the torque measurement from the torque pressure transducer is detected, power fluctuations due to the loss of torque measurement are limited by maintaining the feedback command from the feedback controller constant during the momentary loss of torque measurement.

Abstract: The specification discloses a bar screen in combination with apparatus adapted to clean the same by inserting a rake between the bar screen and moving the rake upward. The bar screen comprises a plurality of bar members each having a base component adapted for securement to the bed of the waste waterway and an upright component integrally attached to the base component to form an approximate "L" shaped bar member. The bar members are sized and spaced apart with the base component extending upstream to provide a protected area free of large debris for insertion of the rake means in preparation for the cleaning operation. Such a combination minimizes the possibility of rake damage and increases the cleaning efficiency of the unit.