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Helicopter Flight Simulation Motion Platform Requirements(13)

时间:2011-11-12 12:15来源:蓝天飞行翻译 作者:admin
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highest gain, as shown in appendix A. The resulting gain
and phase distortions are then located on the appropriate criterion in figure 5, depending on whether the filter is a translational or rotational filter.
The criteria show three levels of motion fidelity: high, medium, and low. The definitions are given at the bottom of figure 5. As expected, high motion fidelity is associated with high-gain and low-phase distortion, and low motion fidelity is associated with low-gain and high-phase distortion. Sinacori notes that these criteria “. . . have
little or no support other than ‘intuition’” (ref. 44). Still, these are the most complete criteria proposed to date. The criteria are either unknown or unused in the simulator community today, perhaps because they still need to be validated.
Summary of Criteria. Summarizing the above criteria, there is apparent agreement that the rotational gain can be reduced to 0.5 without a fidelity loss, and that the phase distortion from the high-pass filter should be minimized at 0.5 rad/sec and above. These requirements come primarily from studies of roll and of limited pitch. However, many investigators, somewhat arbitrarily, place the same requirements on yaw, since they believe the yaw requirements are natural extensions of the pitch and roll requirements.


Figure 4. Sway motion fidelity criterion (ref. 43).

Gain @ 1 rad/sec Gain @ 1 rad/sec
High Motion sensations are close to those of visual flight Medium Motion sensation differences are noticeable but not objectionable Low Differences are noticeable and objectionable, loss of performance, disorientation
Figure 5. Sinacori motion-fidelity criteria (ref. 44).
For the translational motion fidelity, the agreement is less apparent. The data for the translational requirements are primarily from lateral translational-axis experiments, with some data from the vertical axis. There are also disagree-ments as to whether these translational cues are more important that the rotational cue, or vice versa.
Since motion fidelity has not been thoroughly examined in all axes, it is possible that some motion degrees of freedom are redundant with the other simulator cues that also allow motion perception. If a motion degree of freedom is unnecessary, then a savings might be realized as a result of the reduced complexity in the design, development, and operation of flight simulators. If a savings benefit is not chosen by a manufacturer, at least an operator would know not to concentrate on tuning the motion in an unnecessary degree of freedom.
An answer to “How much platform motion is enough?” is likely to be vehicle and task dependent. Vehicles that rely greatly on the pilot for stabilization, such as helicopters, will have more stringent platform-motion requirements than vehicles that do not depend on the pilot for stabili-zation. As such, this report focuses on the former, more stringent case.

 


 
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