Accession Number : AD0615893

Title :   STUDY OF OPTIMUM FINAL APPROACH OF AIRCRAFT,

Corporate Author : BELL AEROSYSTEMS CO BUFFALO N Y

Personal Author(s) : Carroll,R. E. ; Tyler,C. H.

Report Date : 15 MAR 1953

Pagination or Media Count : 207

Abstract : The report presents theoretical analyses, based on analog computation, leading to the development of an optimum control system for the final approach maneuver of two very different airframes: the F-80 and the C-47. The study was limited to the use of the aileron and rudder for lateral control; thrust (power) and elevator for vertical control. The use of variable flaps, etc., was not considered. Criteria for competitive comparisons of control systems are postulated under the assumptions of perfect servos, positional data, etc. Aerodynamic coefficients, equations of motion, and computation circuits are developed for the airframes. Various types of possible automatic controls were systematically investigated. The control system which best meets the criteria was determined and is described; it will be referred to as the Optimum System. The Optimum System includes both the lateral and the longitudinal optimum controls and applies to both airframes although the gains on some of the control signals differ slightly. Analytic idealizations of several autopilot systems in present use are compared with each other and with the Optimum System relative to their performances in the final landing approach. It is found that the Optimum System appears slightly better than the others in response to commands and appreciably better in its behavior in gusts. (Author)

Descriptors :   (*APPROACH, OPTIMIZATION), (*AIRCRAFT, APPROACH), AIRFRAMES, AILERONS, AERIAL RUDDERS, CONTROL SYSTEMS, SYSTEMS ENGINEERING, LANDING, PERFORMANCE(ENGINEERING)

Distribution Statement : APPROVED FOR PUBLIC RELEASE