Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

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Published: 1994

Total Pages: 1028

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

The Effects of Control System and Display Variations for an Attack Helicopter Mission Through Piloted Simulation
The Effects of Control System and Display Variations for an Attack Helicopter Mission Through Piloted Simulation

Author: Edwin W. Aiken

Publisher:

Published: 1980

Total Pages: 14

ISBN-13:

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Research into methods by which highly maneuverable advanced helicopters can be made to function - with reasonable pilot workload levels - as stable platforms for target designation and/or weapon delivery at night and in adverse weather is a major interest of the U.S. Army Aeromechanics Laboratory. Two candidate techniques under investigation are: (1) helicopters control system modifications that alter the aircraft's response to pilot control inputs and to external inputs such as turbulence and (2) variations in the methods of which critical information is displayed to the pilot in an attempt to reduce the effort required to interpret and respond to a given situation while still maintaining a satisfactory level of system performance. In support of this research, a piloted simulator experiment was designed and conducted to assess the effects on overall system performance and pilot workload of variations in control system characteristics and display format and logic for a nighttime attack helicopter mission. This paper describes the experiment and presents major results and conclusions. (Author).

A Simulation Investigation of the Effects of Engine-and Thrust-response Characteristics on Helicopter Handling Qualities
A Simulation Investigation of the Effects of Engine-and Thrust-response Characteristics on Helicopter Handling Qualities

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Published: 1983

Total Pages: 28

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A program is being conducted to study the effects of engine response, rotor inertia, rpm control, excess power, and vertical damping on specific maneuvers included in nap-of-the-Earth (NOE) operations. Specifically, this study concentrates on the helicopter configuration with an rpm-governed gas-turbine engine and expands on handling qualities-criteria data by focusing on aspects peculiar to rotary-wing and NOE operations. This paper summarizes results of three moving-based piloted simulation studies and explores the frequency characteristics of helicopter thrust response which set it apart from other VTOL types. Power-system response is affected by both the engine governor response and the level of rotor inertia. However, results indicate that, with unlimited power, variations in engine response can have a significant effect on pilot rating, whereas changes in rotor inertia, in general, do not. Results also show that any pilot interaction required to maintain proper rpm control can significantly degrade handling qualities. Data for variations in vertical damping and collective sensitivity are compared with existing handling-qualities specifications, MIL-F-83300 and AGARD 577, and show a need for higher minimums for both damping and sensitivity for the bob-up task.

Results of a Simulator Investigation of Control System and Display Variations for an Attack Helicopter Mission
Results of a Simulator Investigation of Control System and Display Variations for an Attack Helicopter Mission

Author: Edwin W. Aiken

Publisher:

Published: 1980

Total Pages: 25

ISBN-13:

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A piloted simulator experiment designed to assess the effects on overall system performance and pilot workload of variations in control system characteristics and display format and logic for a nighttime attack helicopter mission is described. The simulation facility provided a representation of a helmet-mounted display image consisting of flight-control and fire-control symbology superimposed on the background video from a simulated forward-looking infrared sensor. Control systems ranging from the baseline stability and control augmentation system to various hover augmentation schemes were investigated together with variations in the format and logic of the superimposed symbology. Selected control system and display failures were also simulated. The results of the experiment indicate that the baseline control/display system is unsatisfactory without improvement for the evaluation task which included a hovering target search and acquisition. Significant improvements in pilot rating were achieved by both control system and display variations.

Essais en Vol
Essais en Vol

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Mechanics Panel. Symposium

Publisher:

Published: 1992

Total Pages: 428

ISBN-13:

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