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  • 1
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    Vibronic effects in the predissociation of the C/1/Pi/u state of C2N2 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The partitioning of excess photochemical energy as a function of the vibrational energy of the state of C2N2 has been measured. Surprisal theory has been used to analyze the data and it shows that complete randomization does not occur before dissociation. The results are also inconsistent with the predictions of the quasidiatomic theory for photodissociation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 71; Dec. 1
    Format: text
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  • 2
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    Simulator study of the effect of visual-motion time delays on pilot tracking performance with an audio side task (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of time delay was determined in the visual and motion cues in a flight simulator on pilot performance in tracking a target aircraft that was oscillating sinusoidally in altitude only. An audio side task was used to assure the subject was fully occupied at all times. The results indicate that, within the test grid employed, about the same acceptable time delay (250 msec) was obtained for a single aircraft (fighter type) by each of two subjects for both fixed-base and motion-base conditions. Acceptable time delay is defined as the largest amount of delay that can be inserted simultaneously into the visual and motion cues before performance degradation occurs. A statistical analysis of the data was made to establish this value of time delay. Audio side task provided quantitative data that documented the subject's work level.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TP-1216 , L-11996
    Format: application/pdf
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  • 3
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    Evaluation of several secondary tasks in the determination of permissible time delays in simulator visual and motion cues (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of secondary tasks in determining permissible time delays in visual-motion simulation of a pursuit tracking task was examined. A single subject, a single set of aircraft handling qualities, and a single motion condition in tracking a target aircraft that oscillates sinusoidally in altitude were used. In addition to the basic simulator delays the results indicate that the permissible time delay is about 250 msec for either a tapping task, an adding task, or an audio task and is approximately 125 msec less than when no secondary task is involved. The magnitudes of the primary task performance measures, however, differ only for the tapping task. A power spectraldensity analysis basically confirms the result by comparing the root-mean-square performance measures. For all three secondary tasks, the total pilot workload was quite high.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TP-1214 , L-12006
    Format: application/pdf
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  • 4
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    Model for the solution of supersonic viscous interaction effects on blunted cones (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: AIAA Journal; 13; Mar. 197
    Format: text
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  • 5
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    Flying qualities of an aircraft with strong lateral-directional coupling (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Flying qualities of aircraft with strong lateral-directional coupling may be unsatisfactory without command and stability augmentation. Although sensitivity to stability derivative variation may be decreased by such a flight control system (FCS), deficiencies associated with control derivative uncertainty may persist or worsen. This is especially true in systems with necessarily high gains, e.g., the Space Shuttle Entry FCS. Effects of stability/control derivative variations on the flying qualities of the Space Shuttle (with and without FCS) have been investigated, and the unaugmented Space Shuttle has been simulated in flight using Princeton's Variable-Response Research Aircraft (VRA).
    Keywords: SPACE TRANSPORTATION
    Type: AIAA PAPER 78-1361 , Atmospheric Flight Mechanics Conference; Aug 07, 1978 - Aug 09, 1978; Palo Alto, CA
    Format: text
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  • 6
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    Electret tape transducer (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: GENERAL
    Type: AD-A021736 , RADC-TR-76-22
    Format: text
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  • 7
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    Study of an aircraft decoupled longitudinal control system for approach and landing (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A series of ground-based and in-flight simulation studies of the application of steady-state decoupled longitudinal controls to a short take-off and landing (STOL) transport have been made. The externally blown flap STOL was selected for study because it was considered to be a worst-case situation from the control viewpoint. The decoupled longitudinal control system used constant prefilter and feedback gains to provide independent control of flight-path angle, pitch angle, and forward velocity during landing approach. The decoupled controls were compared to a more conventional stability augmentation system. The pilots were enthusiastic about the decoupled controls; the pilot workload was reduced and the landing performance significantly improved. The benefit of the decoupled controls was more dramatic during in-flight simulation using a variable stability airplane than was the case with either fixed- or moving-base, ground-based simulators.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Atmospheric Flight Mechanics Conference; Jun 07, 1976 - Jun 09, 1976; Arlington, TX
    Format: text
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  • 8
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    The effect of visual-motion time delays on pilot performance in a pursuit tracking task (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study has been made to determine the effect of visual-motion time delays on pilot performance of a simulated pursuit tracking task. Three interrelated major effects have been identified: task difficulty, motion cues, and time delays. As task difficulty, as determined by airplane handling qualities or target frequency, increases, the amount of acceptable time delay decreases. However, when relatively complete motion cues are included in the simulation, the pilot can maintain his performance for considerably longer time delays. In addition, the number of degrees of freedom of motion employed is a significant factor.
    Keywords: BEHAVIORAL SCIENCES
    Type: Visual and Motion Simulation Conference; Apr 26, 1976 - Apr 28, 1976; Dayton, OH
    Format: text
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  • 9
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    Decoupled longitudinal controls for shear penetration in the terminal area environment (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of decoupled longitudinal controls is simulated for the approach and landing of a twin engine jet transport in the presence of wind shear. Decoupled or independent control of pitch angle, flight-path angle and forward velocity using constant prefilter and feedback gains was compared to conventional control of a B-737 aircraft simulator. It is found that the mean flight-path angle, the mean glideslope error and the mean deviation in indicated airspeed generally improved when decoupled controls were used in the approach. An improvement in touchdown parameters was also observed, especially in strong shear, when 44% of conventionally-controlled flights impacted short of the runway. Simulator pilots reported improved approach performance and a reduced workload when decoupled controls were used.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AIAA PAPER 79-1678 , Atmospheric Flight Mechanics Conference for Future Space Systems; Aug 06, 1979 - Aug 08, 1979; Boulder, CO
    Format: text
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  • 10
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    Moving-base visual simulation study of decoupled controls during approach and landing of a STOL transport aircraft (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The simulation employed all six rigid-body degrees of freedom and incorporated aerodynamic characteristics based on wind-tunnel data. The flight instrumentation included a localizer and a flight director which was used to capture and to maintain a two-segment glide slope. A closed-circuit television display of a STOLport provided visual cues during simulations of the approach and landing. The decoupled longitudinal controls used constant prefilter and feedback gains to provide steady-state decoupling of flight-path angle, pitch angle, and forward velocity. The pilots were enthusiastic about the decoupled longitudinal controls and believed that the simulator motion was an aid in evaluating the decoupled controls, although a minimum turbulence level with root-mean-square gust intensity of 0.3 m/sec (1 ft/sec) was required to mask undesirable characteristics of the moving-base simulator.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TN-D-7790 , L-9721
    Format: application/pdf
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