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Helicopter Flight Simulation Motion Platform Requirements(16)

时间:2011-11-12 12:15来源:蓝天飞行翻译 作者:admin
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These results will provide guidance to simulator manufacturers, operators, and regulators on how to build better helicopter simulators and how to use them more effectively for training and research.

Outline
Because the Vertical Motion Simulator at NASA Ames Research Center was used in all the experiments discussed in this report, that facility is described first. Five experiments are then discussed: the Yaw Experiment; Vertical Experiments I, II, and III; and the Roll-Lateral Experiment. The experiments are presented in a common format in which each experiment addresses key questions that still remain regarding how pilots use platform-motion cues. The Yaw Experiment focused on the interaction between lateral translational platform motion and yaw rotational platform motion. Vertical Experiment I explored the ways in which the quality of vertical motion cues affects end-to-end pilot-vehicle performance and pilot opinion. Vertical Experiment II determined how key metrics in the pilot-vehicle control loops vary as the quality of vertical motion cues changes. Vertical Experiment III examined the interaction between the vertical platform-motion cue and the visual cues. And in the Roll-Lateral Experiment, the interaction between roll and lateral translational platform-motion cues was explored.
The results of these five experiments are then summarized and presented as a set of recommendations for the manu-facturer and user communities. In the interest of consist-ency, the recommendations of this work are also discussed comparatively with the results of previous work in motion cueing. Finally, a procedure that makes the most effective use of the recommendations in configuring motion cues for any motion platform is suggested, principal conclusions are set forth, and areas requiring further research are identified.

 

2. The Vertical Motion Simulator
General Description
The Vertical Motion Simulator (VMS) (ref. 45) at NASA Ames Research Center was used in all of the experiments reported herein. It is the world’s largest flight simulator. A cutaway view of the motion system and its position, velocity, and acceleration limits are shown in figure 6. It is an electrohydraulic servo system, with a payload of 140,000 lb. This payload is pneumatically counter-weighted with pressurized nitrogen. Both the vertical and lateral translational degrees of freedom are driven with separate electric motors in a rack-and-pinion arrangement. The remaining degrees of freedom are hydraulic.
VMS Nominal Operational Motion Limits

Axis  Displ  Velocity  Accel 
Vertical  ± 30  16  24 
Longitudinal  ± 20  8  16 
Lateral  ± 4  4  10 
Roll  ± 18  40  115 
Pitch  ± 18  40  115 
Yaw  ± 24  46  115 

All numbers, units ft, deg, sec

Figure 6. Vertical Motion Simulator.
 
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