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• W4324257725 startingPage "114119" @default.
• W4324257725 abstract "The flow field around a frigate is complex due to flow detachments, high velocity gradients, and flow unsteadiness. These flow patterns can endanger helicopter operations around frigates and increase pilot workload above the flight deck. This paper contains a comparative analysis of three different recovery maneuvers: an approach from the stern in the centerline plane (S); a diagonal maneuver (D); and an L-shaped maneuver. The comparison is made using wind tunnel tests with a scaled frigate and a motorized helicopter. For the three maneuvers, velocity contours around the helicopter with Particle Image Velocimetry are obtained. An internal balance is also used to obtain forces and moments on the helicopter during the flight path of the maneuvers. Those measurements show that the wake of the ship mostly affects longitudinal and thrust forces. In addition, pitch torque is highly reduced when the helicopter is behind the frigate superstructure, and the roll moment is also important when the wind angle increases. In the end, an estimation of pilot workload is presented to conclude that L-shaped maneuver is the best for 0° and small WOD angles and D or S recoveries for moderately high negative WOD angles." @default.
• W4324257725 created "2023-03-15" @default.
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• W4324257725 date "2023-05-01" @default.
• W4324257725 modified "2023-10-01" @default.
• W4324257725 title "A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements" @default.
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• W4324257725 doi "https://doi.org/10.1016/j.oceaneng.2023.114119" @default.
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