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Figure 14 illustrates the rms cockpit control (pedal) rate for the four motion configurations. Often, this measure is associated with pilot workload, with more control rate being generally indicative that more pilot lead compensa-tion is required. The analysis of variance for these data shows that when translational motion was added, the decrease in pedal rate was statistically significant (F(1,4) = 18.53, p = 0.013). No significant differences were noted when rotational motion was added, and rotational and translational motion effects did not interact. It is not surprising that the addition of the lateral translational motion improves the pilot-vehicle perfor-mance for this and the later tasks. The addition of the 0 No rotation Rotation Figure 14. Control rate for Task 1. translational cue not only better emulates the real world cue, but it also provides a strong indication of the vehicle’s rotational acceleration (eq. (7)). Thus, the pilot can use this information effectively to place a zero in the open loop of his rotational-rate control in order to ameliorate the effects of high-frequency lags. Subjective Performance Data. Figure 15 shows the means and standard deviations of the compensation required (i.e., extensive, considerable, moderate, or minimum), as rated by the pilots, for the four motion conditions. When translational motion was added, the compensation that was required significantly decreased from considerable to moderate compensation (F(1,5) = 6.83, p = 0.047) and no significant differences were found for the addition of rotational motion. Rotational and translational motion did not interact for pilot compensa-tion. These subjective pilot opinions are consistent with the objective control-rate differences just discussed. That is, the addition of translational motion reduced control activity, which in turn likely reduced pilot opinion of the required compensation. Similar results were obtained for the pilots’ rating of motion fidelity, as shown in figure 16. When translational motion was added, the motion fidelity rating improved (F(1,5) = 7.74, p = 0.039). The fidelity increased from low-to-medium to medium-to-high, on average. Although the data visually suggest an improvement in fidelity with the addition of rotational motion, the improvement was not statistically significant. Rotational and translational motion did not interact in the fidelity ratings. Extens.
was less than 0.5 ft forward of the motion-system’s rotation point. It is possible that depending on the variation in pilots’ posture, this small offset may have 直升机网 www.helicopter.cn 直升机翻译 www.aviation.cn 本文链接地址：Helicopter Flight Simulation Motion Platform Requirements(24) |
