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In the rotational axes, the criteria apply only to pitch and roll; yaw was found to be redundant. Only the work of Bergeron (ref. 38) evaluated a range of yaw configurations, which was discussed earlier. The only inconsistency between the previous work and the criteria suggested is the work by Shirachi and Shirley (ref. 42). Their experiment did not vary motion-filter natural frequency, which provided 62.5° of phase distortion at 1 rad/sec, which is 2.5° in excess of the Medium fidelity boundary. Still, the boundary at 60° should remain, for both the work of Stapleford et al. (ref. 26) and Bray (ref. 27) support it. If Shirachi and Shirley had evaluated conditions with less phase distortion, those conditions might have been preferred. In the translational axes, a “region of uncertainty” extends into the Low fidelity region; this does not suggest an inconsistency, however, because that area simply was not evaluated by Jex et al. (ref. 43). However, a “delayed side force” region cuts off an area in Medium fidelity. The delayed-side-force region applies to the sway axis when that axis is used to eliminate the specific force that arises from platform roll. That region was not explored in section 7, and it may merit additional examination. However, the delayed-side-force region is certainly adequate when trying to represent true math model cues, as shown in the vertical experiments discussed in sections 4 and 5. There is another inconsistency in the translational axis when compared to the results of Cooper and Howlett (ref. 40). The displacement of their simulator was clearly limited as shown by their boundary “too much displace-ment.” And their report states “Pilot criticism to motion anomalies during returns from steady maneuvers still is a problem.” So, their region of “best compromise” is likely to be based on their simulator’s capability. It is interest-ing to note that their rotational axis filter is well within the High fidelity region. Since their platform is syner-gistic (angular motion usurps translational motion and vice versa), figure 80 suggests that they might relax their angular motion in order to gain translational motion. This change might allow both angular and translational axes to be in the Medium fidelity region for some maneuvers, rather than one in High and one in Low. The remaining comparisons in figure 80 for the translational axes are favorable. In general, the suggested criteria are reasonably consistent with those of previous work. TranslationalPitch/roll
Rotational gain 100 Rotational gain
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