Accession Number : ADA018126

Title :   All Digital Simulation for Manned Flight in Turbulence.

Descriptive Note : Final rept. Jan 74-Mar 75,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Pollard,Joseph J.

Report Date : SEP 1975

Pagination or Media Count : 189

Abstract : A completely digital simulator for manned flight in conventional aircraft through a turbulent environment is developed. The six-degree-of-freedom constant coefficient linearized perturbation equations of motion are developed for use in conjunction with a generalized stability augmentation system. A six-degree-of-freedom turbulence environment suggest by Mil Spec 8785B is implemented by solving stochastic linear differential equations. A pilot consisting of two parts: (1) a decision making data processor and (2) a physical implementation of the required control action is developed. Concepts such as urgency for action, instrumentation thresholds, pure pilot delay, pilot prediction, pilot lag, and pilot motor noise are treated. The resulting all digital closed loop multi-axis, multi-input, multi-output system is applied to aircraft of various classes including the F-5, A-7, 707, and T-33. Results are presented in tabular and graphical form with statistical tests run to show simulation validity and comparability with actual man-in-the-loop simulations. Additional applications of the digital simulator are made showing its usefulness in the overall concept of aircraft simulation. (Author)

Descriptors :   *Flight simulators, *Turbulence, *Pilots, *Mathematical models, *Man machine systems, *Flight simulation, Digital systems, Linear differential equations, Stochastic processes, Input, Output, Stability, Augmentation, Stochastic processes, Equations of motion, Decision making, Performance(Human), Jet fighters, Attack aircraft, Training planes, Commercial aircraft, Computer programs, Fortran

Subject Categories : Computer Programming and Software
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE