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Identification and Validation of an Engine Performance Database Model for the Flight Management System

Published Online:https://doi.org/10.2514/1.I010663

This Paper presents the validation studies results of an engine mathematical performance model identification for flight management system trajectory prediction and optimization applications. The methodology was applied to the Cessna Citation X business aircraft, for which the aircraft flight manual and the flight crew operating manual are available. In addition, another data source based on computerized trajectory was also used to generate several climb and descent flight profiles required in the engine model identification process. To demonstrate and further validate the accuracy of the proposed engine performance model, a level-D research aircraft flight simulator of the Cessna Citation X was used as a reference. According to the Federal Aviation Administration (FAA, AC 120-40B), level D corresponds to the highest qualification level for the flight dynamics and engine modeling. Validation of the methodology was accomplished by comparing the prediction model with a series of flight data collected with the flight simulator for different flight conditions and different flight phases including takeoff, climb, cruise, and idle descent. Comparison results were validated with a tolerance of ±5% for each engine performance predicted by the model in terms of fan speed, core speed, thrust, and fuel flow.

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