Improving Gas Turbine Engine Control System

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knowing the fan speed-flow characteristics. Therefore, the uncertainty associated with the low rotor speed sensor accuracy requirement might be very low at an early phase of engine design. Given this situation, the low rotor speed sensor would be considered a "low risk" component and would not likely benefit from delaying detail design. * Finally, the last row includes the dynamic response requirement for the inlet air temperature sensor, or T2 sensor. The time constant uncertainty is considered high with a moderate impact on product cost, weight, and reliability because of this uncertainty. This results in an overall "Moderate" rating. Other factors such as the criticality of the function might be considered to assist in making a decision to apply the revised framework. 5.1.2 Single Requirement Affecting Multiple Components In certain circumstances, a single requirement can potentially affect more than component. An example ofthis is nozzle actuation load, which consists ofthe two basic elements of flap aerodynamic load and friction, is historically difficult to accurately predict. The uncertainty of the friction piece is primarily a function of historical data, relying on the performance of previous designs. Friction of the linkage and flap train can be analytically estimated based on established engineering techniques, but will change over time with engine usage as working clearances change, anti-gallants wear away, and surface corrosion occurs. Historical factors are generally applied to new part predictions to estimate worst-case friction values, but this prediction can contain substantial error. Prior to the availability of reasonably priced, high-powered computing, flap aerodynamic load was estimated in a similar manner - by empirical comparisons to historical data. Within the past decade, complex Computational Fluid Dynamics (CFD) codes have been developed which can run on economical but extremely powerful workstations producing results in a fraction ofthe time previously required on 89

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