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Figure 39. Altitude control: full motion versus no motion.
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90
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85
Altitude, ft
Altitude, ft
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70 -20-10 0 10 20
Vertical velocity, ft/sec
Figure 40. Phase-plane portrait for configuration V1.
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Vertical velocity, ft/sec
Figure 43. Phase-plane portrait for configuration V4.
For the medium-gain, low-phase-distortion case of configuration V5 in figure 44, the bob-up trajectories show good performance, with the trajectories being similar to those of the full-motion case, or at least similar to those of the V2 case. The gain is lowered to 65% of
Altitude, ft
85
80
75
70
full motion for the V5 configuration.
Increasing the phase distortion from configuration V5 to configuration V6 caused a slight reduction in the precision around the desired stationkeeping point with a few under-shoots of the ascent point as shown in figure 45. The gain reduction in going from V3 to V6 does not appear to degrade performance significantly.
The low-gain, low-phase-distortion case, configuration V7 in figure 46, resulted in less precision with more over- and undershoots than in the previous configurations. Here the
Figure 41. Phase plane portrait for configuration V2. gain is at 30% of full motion at high frequencies. Performance definitely decreases when the gain drops from
90
0.65 in configuration V5 to 0.3 in V7.
The precision in V7 also appears worse than in the V4 case of high gain and high phase distortion. Increasing the
85
phase distortion to the V8 case in figure 47 shows a
further reduction in precision from that of the V7 case. Again, the gain of 30% is insufficient, but the combina-tion of the low gain with some phase distortion makes the performance even more degraded.
The low-gain, high-washout case of configuration V9 in figure 48 exhibits a further degradation, the middle of the desired oval being occupied with the aircraft’s trajectory.
Finally, the no-motion case of configuration V10 in figure 49 indicates the worst performance of all; the imprecise control of velocity is obvious at both the top and bottom points.
Altitude, ft
80
75
70
Figure 42. Phase-plane portrait for configuration V3.
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Altitude, ft
Altitude, ft
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70 -20-10 0 10 20 -20-10 0 10 20 Vertical velocity, ft/sec Vertical velocity, ft/sec
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Altitude, ft
Altitude, ft
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Vertical velocity, ft/sec Vertical velocity, ft/sec
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Altitude, ft
Altitude, ft
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本文链接地址：Helicopter Flight Simulation Motion Platform Requirements(35)
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