Accession Number : ADA258031


Title :   Ground Based Simulation Evaluation of the Effects of Time Delays and Motion on Rotorcraft Handling Qualities


Descriptive Note : Final rept.


Corporate Author : SYSTEMS TECHNOLOGY INC HAWTHORNE CA


Personal Author(s) : Mitchell, David G ; Hoh, Roger H ; Atencio, Adolph, Jr ; Key, David L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258031.pdf


Report Date : Jan 1992


Pagination or Media Count : 247


Abstract : An exploratory simulation was conducted on the NASA Ames Research Center's Vertical Motion Simulator (VMS) to evaluate the effects of simulator characteristics on handling qualities for performing hover and low-speed tasks in a helicopter. The primary focus of the study was on subjective assessments of the variations, based on Cooper-Harper Handling Qualities Ratings (HQR's), rather than objective measures of pilot performance. Effects of variations in the three major elements of the simulation--the motion system, visual system, and math model--were evaluated. Seven precision and aggressive low-speed Mission-Task-Elements were performed. All tasks were Level 2 (average HQR worse than 3.5) fixed-base for the baseline helicopter, which was designed to provide Level 1 handling qualities in the real world. Addition Of motion improved ratings 1/2 to 2 points, resulting in Level l handling qualities for most tasks. Tradeoffs in motion acceleration gain and washout break frequency were evaluated with two sets of motion washouts. There was a preference for reduced washout frequencies (resulting in improved phasing between the visual and motion responses at mid to high frequencies, at the sacrifice of onset gain) for the precision tasks. Conversely, there was a slight preference for increased onset gains (at the sacrifice of visual/motion phasing) for the aggressive tasks. The effects on handling qualities of a visual delay compensation algorithm were investigated by three pilots. Helicopter, Handling qualities, Simulation, Time delay, Motion system.


Descriptors :   *AVIATION SAFETY , *HOVERING , VELOCITY , MATHEMATICAL MODELS , ALGORITHMS , FREQUENCY , MODELS , ACCELERATION , PILOTS , MOTION , TIME , HELICOPTERS , RESPONSE , MISSIONS , PRECISION , GAIN , DELAY , RATINGS , COMPENSATION , FLIGHT SIMULATION


Subject Categories : Aerodynamics
      Helicopters


Distribution Statement : APPROVED FOR PUBLIC RELEASE