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  • 1
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    A method of trajectory optimization by fast-time repetitive computations (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Perturbation method of trajectory optimization by fast time repetitive computations of state equations
    Keywords: SPACE SCIENCES
    Type: NASA-TN-D-3404
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Time delays in flight simulator visual displays (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that the effects of delays of less than 100 msec in visual displays on pilot dynamic response and system performance are of particular interest at this time because improvements in the latest computer-generated imagery (CGI) systems are expected to reduce CGI displays delays to this range. Attention is given to data which quantify the effects of display delays in the range of 0-100 msec on system stability and performance, and pilot dynamic response for a particular choice of aircraft dynamics, display, controller, and task. The conventional control system design methods are reviewed, the pilot response data presented, and data for long delays, all suggest lead filter compensation of display delay. Pilot-aircraft system crossover frequency information guides compensation filter specification.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: Summer Computer Simulation Conference; Aug 25, 1980 - Aug 27, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Simulation replay - Implementation and flight simulation applications (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Throughout the aircraft development process flight simulators are used to evaluate design concepts, 'handling' qualities, and operational procedures. A modern flight research simulator comprises a cockpit equipped with flight instruments and controls, subsystems to provide visual, motion, and other flight cues, and a digital computer. REPLAY is a computer program which enables a user to reproduce the multidimensional flight cues for an entire simulation 'run'. Attention is given to simulation fidelity improvement, simulation data recovery, simulation quality assurance, and aircraft systems research. It is pointed out that each of the applications discussed supports aircraft systems research by improving the realism, efficiency, or reliability of the simulation facility.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: Summer Computer Simulation Conference; Jul 18, 1977 - Jul 20, 1977; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Compensation for time delay in flight simulator visual-display systems (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A piloted aircraft can be viewed as a closed-loop, man-machine control system. When a simulator pilot is performing a precision maneuver, a delay in the visual display of aircraft response to pilot-control input decreases the stability of the pilot-aircraft system. The less stable system is more difficult to control precisely. Pilot dynamic response and performance change as the pilot attempts to compensate for the decrease in system stability, and these changes bias the simulation results by influencing the pilot's rating of the handling qualities of the simulated aircraft. Delay compensation, designed to restore pilot-aircraft system stability, was evaluated in several studies which are reported here. The studies range from single-axis, tracking-task experiments (with sufficient subjects and trials to establish 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.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 83-1080 , Flight Simulation Technologies Conference; Jun 13, 1983 - Jun 15, 1983; Niagara Falls, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The use of integral transforms in the estimation of time variable parameters (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Integral transformations used in time variable parameter estimation
    Keywords: MATHEMATICS
    Type: NASA-TN-D-5194
    Format: application/pdf
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  • 6
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    The effects of time delay in man-machine control systems: Implications for design of flight simulator Visual-Display-Delay compensation (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: When human operators are performing precision tracking tasks, their dynamic response can often be modeled by quasilinear 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.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: AD-P004329 , AF Human Resources Lab. The IMAGE 3 Conf. Proc.; p 331-343
    Format: text
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  • 7
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    Aircraft simulation data management - A prototype system (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Piloted flight simulations are used throughout the aircraft development process to evaluate design concepts, handling qualities and operational procedures. Simulation project managers are often inundated with data but without a convenient and efficient way to make the correlations and analyses necessary to evaluate system performance. A computer-based Simulation Management System (SIMS) is under development. SIMS will permit simulation project engineers to quickly acquire, access, display, edit, analyze, and document the information necessary to more efficiently manage the research program. SIMS features interactive, associative access to simulation data. This paper describes SIMDEM, a prototype system designed to demonstrate these concepts and procedures in order to obtain feedback from simulator users to guide system design.
    Keywords: AERONAUTICS (GENERAL)
    Type: Summer Computer Simulation Conference; Jul 24, 1978 - Jul 26, 1978; Newport Beach, CA
    Format: text
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  • 8
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    Systems identification using integral transforms (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Systems identification in parameter estimation to acquire stability properties using integral transforms
    Keywords: ELECTRONICS
    Type: U. OF HAWAII, HAWAII INTERNATIONAL CONFERENCE ON SYSTEM SCIENCES, 2ND, U. OF HAWAII; Jan 22, 1969 - Jan 24, 1969; HONOLULU, HI
    Format: text
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    NASA TECHNICAL REPORTS
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