Backup Control for a Variable Cycle Engine.
Interim technical rept. Aug 76-Aug 77 on phase 1,
GENERAL ELECTRIC CO CINCINNATI OHIO AIRCRAFT ENGINE GROUP
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This report documents the results of Phase I, the trade studies, of the Backup Control for a Variable Cycle Engine program. The trade studies were based on a single engine aircraft, the JTDE-23 engine and a full authority digital electronic primary control system. A minimum get home capability was defined which included completing a takeoff, a minimum climb rate, deceleration from supersonic flight, windmill air start, minimum cruise range, wave-off, landing and safe runway roll. Backup control requirements were determined using the YF17 aircraft data for thrust, the JTDE-23 engine computer model for the variables to be controlled, and the F101 engine and control model for transient performance. Seven backup control approaches were selected for consideration from a list of 48 posssibilities. These approaches included hydromechanical, electrical, fluidic and a combination of electricalhydromechanical technologies. Reliability estimates were made on six controls and estimated performance, volume, weight, cost analyses and preliminary design studies were made in more detail on three of these approaches. A recommended approach was selected namely, the hydromechanical backup control using speed demand and fuel flow scheduling. This selection was based on the above analyses and studies, together with a comparison of the technologies, a comparison of parallel versus series type backupprimary control interface and a tabulated evaluation of each backup controls advantages and disadvantages.
- Attack and Fighter Aircraft
- Jet and Gas Turbine Engines