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Purpose of This Report
The purpose of this report is to develop reasonable guidelines for the use of motion in helicopter simulations. Areas in which weak guidance exists on how to employ key motion cues will be strengthened. Specifically, it will be first determined if yaw requirements are a natural extension of pitch and roll requirements. Second, the fidelity effects of vertical motion and their interaction with visual cues in altitude control will be determined. Finally, requirements for the relative magnitudes of roll and lateral translational motion will be investigated.
Approach
Although platform-motion research has been conducted previously, the approach used here is, perhaps, more valid. There are several reasons for this greater validity. First, the world’s largest displacement flight simulator was used in all of the experiments. Use of this experi-mental device allows selected flying tasks to be duplicated faithfully. That is, the math model, the visual cues, and the motion cues can be matched as a baseline, and then the effects of altering motion can be subsequently determined. Second, representative helicopter math models were used, with one model identified from flight test. This approach allows helicopter-specific requirements to be determined. Third, highly experienced test pilots were used as subjects, and their insightful comments allow confident extrapolations from simulation to flight. Finally, the results were corroborated with both objective and subjec-tive data. In most cases, enough data were collected to allow the measures to be quantified statistically, an advantage that limited facility-use time often does not allow.
These methods should provide a high degree of confidence in the results. They were applied in order to the yaw, vertical, roll, and lateral translational degrees of freedom. Motions in the yaw and vertical axes were examined first, because these motions are the simplest. That is, the gravity vector remains aligned relative to the cockpit for these motions. Next, the coupled roll and lateral axes were explored. These motions are coupled, since the gravity vector rotates relative to the cockpit. The coupled pitch and longitudinal axes have been left for future work; however, the requirements in pitch and longitudinal are not expected to differ substantially from those of roll and lateral.
Contributions
1.
The results indicate that yaw rotational platform motion has no significant effect in hovering flight simulation. For three tasks that broadly represented hovering flight, the addition of yaw-rotational motion yielded insignificant changes in pilot-vehicle posi-tioning performance, pilot control activity, pilots’ rating of required control compensation, and pilots’ opinion of motion fidelity.
2.
Lateral translation of the motion platform has a significant effect on hovering flight simulation. For three tasks that broadly represent hovering flight, the addition of lateral translational motion improved pilot-vehicle positioning performance, reduced pilot control activity, lowered pilot ratings of required control compensation, and improved pilots’ opinions of motion fidelity.
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本文链接地址：Helicopter Flight Simulation Motion Platform Requirements(14)
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