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Helicopter Flight Simulation Motion Platform Requirements(15)

时间:2011-11-12 12:15来源:蓝天飞行翻译 作者:admin 点击:
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3.  
Lateral translation of the motion platform, plus typical visual cues, made pilots believe that the motion platform was rotating when it was not. That is, pilots believed they were physically rotating when the yaw platform degree of freedom was stationary. A hypothesis is that the time delay for the onset of vection is reduced, thus making pilots believe they are rotating.


4.  
The three previous contributions may be combined to suggest that if lateral translational platform motion is presented, available simulator platform actuator displacement should not be used for yaw. Instead, the actuator displacement should be diverted to axes that can derive more benefit from motion.

5.  
Vertical platform motion has a significant effect on simulation fidelity. For target tracking and disturbance-rejection tasks, the following occurred as the platform motion neared visual scene motion:

(a)
 improved tracking and disturbance-rejection performance, (b) reduced pilot control activity,

(c)
 improved pilot opinion of motion fidelity,

(d)
 improved pilot-vehicle target-tracking phase margin, (e) higher pilot-vehicle disturbance-rejection crossover frequencies that were correlated with vertical acceleration phasing rather than with vertical axis gain, and (f) additional pilot-vehicle disturbance-rejection phase margin that was correlated with vertical axis gain rather than with vertical acceleration phasing.

 

6.  
A previously developed and unvalidated motion-fidelity criterion for the vertical axis was revised and validated. The new criterion predicts the fidelity effects of changes in the gain and the break frequency of high-pass motion filters. The revised specification allows for more reduction in the vertical gain than previously specified. The revision also suggests that the combination of a reduction in gain and an increase in filter natural frequency is worse than either perturbation alone.

7.  
Vertical platform motion affected pilot estimates of steady-state altitude during altitude repositionings. This result refutes the generally accepted view that a pilot’s altitude and altitude-rate feedbacks are derived from the visual cues alone. The implication is that the input and output cueing assumptions in existing pilot models are incorrect.

8.  
For coordination requirements in the coupled roll and lateral motion axes, a combination of previous and herein revised criteria resulted in a good prediction of motion fidelity. Also, substantial improvements in performance and opinion were demonstrated between the full-motion and no-motion configurations.


9.  A procedure was developed that allows simulator users to configure their motion platforms to extract the most simulator fidelity they can from the device. The procedure uses the fidelity criteria validated herein. It suggests to users that if they are not satisfied with their predicted fidelity they should consider modifying the simulated task.
 
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