Accession Number : ADA180983

Title :   Experimental Investigation of the Short-Period Requirements of MIL-F-8785C. Volume 1.

Descriptive Note : Interim rept. Jun 84-Dec 85,

Corporate Author : ARVIN/CALSPAN ADVANCED TECHNOLOGY CENTER BUFFALO NY

Personal Author(s) : Bailey,Randall E.

Report Date : NOV 1986

Pagination or Media Count : 119

Abstract : In the current military specification for flying qualities of piloted airplanes (MIL-F-8785C), the short period frequency requirement is expressed as a function of the aircraft's normal acceleration response to angle of attack changes (n/alpha). An investigation of the short period frequency requirements of MIL-F-8785C was performed using the USAF/TIFS in-flight simulator. Thirty-five evaluations of 18 configurations were conducted. The experiment examined the minimum frequency boundary at three values of (n/alpha) for one true airspeed. The experiment included the effects of pilot location and evaluation task. The data indicate that the current requirement is essentially valid. The minimum acceptable frequency boundary may be relaxed, however, when the pilot station is forward of the center of rotation. Also, the phasing between the normal acceleration and pitch rate responses has been shown to be a critical determinant of longitudinal short period flying qualities. The results are analyzed using the equivalent systems methodology. Keywords: Flying qualities; Handling qualities; Flight control system; Control Also anticipation parameter.

Descriptors :   *FLIGHT CONTROL SYSTEMS, *SPECIFICATIONS, *FLIGHT MANEUVERS, ACCELERATION, RESPONSE, PILOTS, HANDLING, QUALITY, MILITARY REQUIREMENTS, AIRSPEED, AIRCRAFT, METHODOLOGY, BOUNDARIES, FREQUENCY, INFLIGHT, SIMULATORS, STATIONS, PITCH(MOTION), REQUIREMENTS, SHORT RANGE(TIME), ANGLE OF ATTACK, MAN MACHINE SYSTEMS, LOAD DISTRIBUTION, ATTITUDE CONTROL SYSTEMS, MANUAL OPERATION, ROTATION, CONTROL STICKS, AUGMENTATION, AERODYNAMIC STABILITY, TRANSFER FUNCTIONS

Subject Categories : Flight Control and Instrumentation
      Military Aircraft Operations
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE