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Identification and simulation evaluation of an AH-64 helicopter hover math modelFrequency-domain parameter-identification techniques were used to develop a hover mathematical model of the AH-64 Apache helicopter from flight data. The unstable AH-64 bare-airframe characteristics without a stability-augmentation system were parameterized in the convectional stability-derivative form. To improve the model's vertical response, a simple transfer-function model approximating the effects of dynamic inflow was developed. Additional subcomponents of the vehicle were also modeled and simulated, such as a basic engine response for hover and the vehicle stick dynamic characteristics. The model, with and without stability augmentation, was then evaluated by AH-64 pilots in a moving-base simulation. It was the opinion of the pilots that the simulation was a satisfactory representation of the aircraft for the tasks of interest. The principal negative comment was that height control was more difficult in the simulation than in the aircraft.
Document ID
19910062553
Document Type
Conference Paper
Authors
Schroeder, J. A. (NASA Ames Research Center Moffett Field, CA, United States)
Watson, D. C. (NASA Ames Research Center Moffett Field, CA, United States)
Tischler, M. B. (NASA Ames Research Center Moffett Field, CA, United States)
Eshow, M. M. (U.S. Army, Aeroflightdynamics Directorate, Moffett Field CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Subject Category
AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number
AIAA PAPER 91-2877
Meeting Information
AIAA Atmospheric Flight Mechanics Conference(New Orleans, LA)
Distribution Limits
Public
Copyright
Other