## A Motion-constraint Logic for Moving-base Simulators Based on Variable Filter Parameters |

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acceleration components acceleration profiles airplane longitudinal amplitude ratio angular base-line values blown flap STOL CD CD CD center of gravity commanded Computed flight data control input conventional linear filters coordinated current base position damping ratios decoupled longitudinal control degrees of freedom displacement externally blown flap Figure 13 Figure 17 filters with braking flap STOL transport Flight Simulators flight-path angle frequency and damping ft/sec functions high-pass filters I I I Langley Research Center Laplace operator logic for moving-base longitudinal channel longitudinal control system low-level turbulence m/sec meters ft modified constraint logic modified washout logic motion base motion system motion-base limits motion-constraint logic NASA TN null position performance limits phase angle pilots were unable position limits presented in figure rad/sec radians or degrees rotation sec Figure 16 short take-off Stanley F tilting U.S. Customary Units vertical channel washout techniques washout-with-braking logic Washout-with-braking Modified washout Wind-up turn flight