TM 55-6930-212-102-13. MOTIONSYSTEM.2-14. The simulator compartment is mounted on a six-degree-of-freedom (6-DOF) motion system that consists of amoving platform assembly that is driven and supported from below by six hydraulic actuators. The motion systemprovides cues for pitch, roll, yaw, lateral, longitudinal, and vertical movements. To produce realtime dynamic motioncues, system motion can be either independent (without simultaneous motion in any other degree of freedom) or in anydesired combination.2-15. Flight simulation includes combined motion that represents changes in aircraft attitude that result directly from useof flight controls, rough air and wind, changes in aircraft weight and center of gravity that result from fuel consumption,winching operations, cargo loading, troop displacement, or weapon and ammunition depletion. Motion effects such asblade imbalance, blades out-of-track, and touchdown impact are also simulated.2-16. Within the system mechanical limits, the simulator computer programs cause the motion system to respondrealistically to aerodynamic forces and moments. After the computed accelerations have reached zero, all motionsexcept pitch are imperceptibly washed out to neutral. Pitch attitude is maintained as necessary to simulate sustainedlongitudinal acceleration cues. Acceleration onset cues are scaled as large as possible for full use of the range of motioncapabilities of each degree of freedom.2-17. Depending upon which flight profile is being used, the motion system responds to computer input signals asdiscussed in the following paragraphs.2-18. GROUND CONDITIONS.2-19. The motion system simulates motion of the aircraft on the apron, taxiway, and runway. The motion is a random,low-frequency, low-amplitude, multidirectional oscillation with reasonably abrupt application. This includes irregularitiesof unimproved or unprepared surfaces, longitudinal effects due to abrupt brake applications, and lateral effects due toasymmetrical braking.2-20. TAKEOFF AND LANDING.2-21. Transition to flight is indicated by abrupt cessation of the random oscillation. The motion system provides theindications of takeoff and maintains an attitude appropriate for hover. Appropriate motion effects occur as a result ofchanges in simulated accelerations during transition to flight.2-22. Similar effects are reproduced during the landing phase, causing appropriate longitudinal and vertical vibrationeffects to occur as in the helicopter. The motion system reproduces the landing impact according to the existing aircraftattitude and vertical and sideslip velocities. When vertical momentum is too great, landing bounce is simulated.Pitching and rolling effects of single or multi-gear contact are reproduced, and the magnitude of the bounce dependsupon the current landing weight. The longitudinal effects of brake application are also simulated.2-23. NORMAL FLIGHT.2-24. The motion system simulates the complex and repeated cues occurring during all the maneuvers associated withairwork. Varying degrees of turbulence2-5
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