Backup Control for a Variable Cycle Engine.
Abstract
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 electrical/hydromechanical 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 backup/primary control interface and a tabulated evaluation of each backup control's advantages and disadvantages.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1977
- Accession Number
- ADA055658
Entities
People
- Garry L. Poppel
- Howard B. Kast
- James E. Hurtle
Organizations
- General Electric