Accession Number : ADP004329

Title :   The Effects of Time Delay in Man-Machine Control Systems: Implications for Design of Flight Simulator Visual-Display-Delay Compensation,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Crane,D. F.

Report Date : SEP 1984

Pagination or Media Count : 13

Abstract : When human operators are performing precision tracking tasks, their dynamic response can often be modeled by quasi-linear describing functions. That fact permits analysis of the effects of delay in certain man-machine control systems using linear control system analysis techniques. The analysis indicates that a reduction in system stability is the immediate effect of additional control system delay, and that system characteristics moderate or exaggerate the importance of the delay. A selection of data (simulator and flight test) consistent with the analysis is reviewed. Flight simulator visual-display-delay compensation, designed to restore pilot-aircraft system stability, was evaluated in several studies which are reviewed here. The studies range from single-axis, tracking-task experiments (with sufficient subjects and trials to establish the statistical significance of the results) to a brief evaluation of compensation of a computer-generated-imagery (CGI) visual display system in a full six-degree-of-freedom simulation. The compensation was effective -- improvements in pilot performance and workload or aircraft handling-qualities rating (HQR) were observed. Results from recent aircraft handling-qualities research literature, which support the compensation design approach, are also reviewed. (Author)

Descriptors :   *Flight simulators, Man machine systems, Time lag theory, Pilots, Performance(Human), Control systems, Display systems, Image motion compensation, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE