To obtain handling qualities ratings similar to flight in a ground based motion simulator, the motion and visual pilot cueing systems should be optimized to provide realistic cues. A handling qualities experiment cond...
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ISBN:
(数字)9781624101830
ISBN:
(纸本)9781624101830
To obtain handling qualities ratings similar to flight in a ground based motion simulator, the motion and visual pilot cueing systems should be optimized to provide realistic cues. A handling qualities experiment conducted on the Vertical Motion Simulator using the GenHel UH-60A Black Hawk helicopter math model demonstrated the benefits of an optimized simulation system. The simulator's motion and visual system frequency responses were measured, the aircraft math model was adjusted to account for the simulator motion system delays, and the motion system gains and washouts were tuned for the bob-up, sidestep and hover tasks. The resulting handling quality ratings from the optimized simulation system are better than the simulation system with the standard GenHel math model for all three tasks. The sidestep and bob-up handling qualities ratings for the optimized simulation system are similar to those from actual flight tests.
Autonomous UAV science missions hold great promise for improving the productivity of airborne science research and applications. Potential UAV science missions have been reviewed and common autonomy needs have been id...
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ISBN:
(纸本)1563477173
Autonomous UAV science missions hold great promise for improving the productivity of airborne science research and applications. Potential UAV science missions have been reviewed and common autonomy needs have been identified. Preliminary efforts to craft an Intelligent Mission Management architecture for observational autonomy are evolving. Three science missions, along with the architecture, the technology needs and operational requirements for autonomy are highlighted.
In many instances, flying qualities predictions from ground-based simulators have proven inaccurate when compared with flight test. Due to the increasing use of flight simulators during aircraft development, there has...
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A flightcontrol system was developed for an unmanned vehicle based on the Kaman K-MAX helicopter. The initial design was based on an 8-DOF linear state-space aircraft model extracted from flight test data. The aircra...
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A series of three XV-15 acoustic flight tests have been conducted over a five year period by a NASA/Army/Bell Helicopter team to evaluate the noise reduction potential for tiltrotor aircraft during terminal area opera...
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A series of three XV-15 acoustic flight tests have been conducted over a five year period by a NASA/Army/Bell Helicopter team to evaluate the noise reduction potential for tiltrotor aircraft during terminal area operations. Lower hemispherical noise characteristics for a wide range of steady-state terminal area type operating conditions were measured during the phase 1 test and indicated that the takeoff and level flight conditions were not significant contributors to the total noise of tiltrotor operations. Phase 1 results were used to design low noise approach profiles that were tested during the phase 2 and phase 3 tests, which used large area microphone arrays to directly measure the ground noise footprints. Approach profile designs emphasized noise reduction while maintaining handling qualities sufficient for tiltrotor commercial passenger ride comfort and flight safety under Instrument flight Rules (IFR) conditions. This paper will discuss the weather, aircraft, tracking, guidance, and acoustic instrumentation systems, as well as the approach profile design philosophy, and the overall test program philosophy. Acoustic results are presented documenting the variation in tiltrotor noise due to changes in operating condition, indicating the potential for significant noise reduction using the unique tiltrotor capability of nacelle tilt.
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