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Helicopter Flight Simulation Motion Platform Requirements(53)

时间:2011-11-12 12:15来源:蓝天飞行翻译 作者:admin
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The configuration that received the best ratings was for
Klat = 0.8/Kroll = 0.6. This configuration was rated better than the 1:1 configuration. A possible reason for the 1:1

configuration not being rated the best could be the ampli-fication of simulation artifacts at the extremes of the motion-system envelope, as discussed later.
Phase error (deg)
Figure 77 presents the average Cooper-Harper ratings for all configurations. The trend of these results follows closely with those of the motion fidelity results. This consistent trend might be expected, because reductions in
perceived fidelity may lessen performance, increase work-load, or both. Sometimes pilots can try to substitute other cues, such as the kinesthetic cues from the force-feel
Rotational gain
systems, for cues that have been reduced or eliminated. However, if this substitution does not result in reduced

performance, it can likely increase workload. Taking Cooper-Harper ratings, as discussed in appendix D, is ideal
for capturing such a trade-off.
0.4
0.2
0.0

Klat
1.0
0.8
0.6
0.0  0.2 0.4 0.6 0.8 1.0
Translational gain

Figure 78. Revised motion fidelity criteria from Vertical Experiment I.
experiment evaluated the effects of gain, and not the effects of high-pass filter break frequency, the abscissas in figure 78 can be combined as shown in figure 79. The average motion-fidelity ratings for the tested configura-
Substantial differences resulted in going from the best configuration (again Klat = 0.8/Kroll = 0.6) to the worst configuration (fixed base). The best configuration elicited satisfactory handling qualities (Level 1, which are ratings less than 3.5), and the worst configuration elicited adequate handling qualities (Level 2, which are ratings between 3.5 and 6.5). Again, as the amount of motion increased, the handling qualities improved.


Proposed Roll-Lateral Specification
The motion-fidelity results map well into a combination of the revised motion-fidelity criteria of Vertical Experiment I, which are shown in figure 78. Since this tions are also shown on this combined specification.
In general, the combined specification matches well with the data. The dividing line between High and Medium fidelity would be at 2.5, and the dividing line between Medium and Low fidelity would be 1.5. An instance that does not match well is for the Klat = 0.4/Kroll = 0.2 configuration for Pilot 1. This configuration would be predicted to be on the borderline of Low and Medium, and this pilot rated the configuration High and Medium in his two evaluations. The other two pilots rated it Low, which matches prediction. Interestingly, Pilot 1 decreased his rating to Low if additional lateral translational motion was provided at the same roll gain. Because an increase in lateral translational motion should not decrease the fidel-ity, the ratings of Pilot 1 for this one point may be due to a random effect, like the order of configurations that were presented to him.
 
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