The effect of ship size on the flying qualities of maritime helicopters

Scott, P., Owen, Ieuan and White, M. (2014) The effect of ship size on the flying qualities of maritime helicopters. In: 70th American Helicopter Society International Annual Forum 2014, 20-22 May 2014, Montreal, QC, Canada.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive


This paper describes the use of Computational Fluid Dynamics (CFD) to produce unsteady ship airwakes to investigate the effect of ship size on the pilot workload at the helicopter-ship dynamic interface. A ship model was created to represent modem naval vessels and geometrically scaled to represent smaller and larger scale ships that currently operate maritime helicopters. An unsteady airwake for each ship was computed at 40 knots for both the Headwind and Green 45° Wind Over Deck (WOD) conditions, while the mid-scale ship was also computed at 30 knots. Using Strouhal scaling, the mid-scale ship airwake was scaled both in terms of velocity and ship size. Comparisons of the resulting small and large scaled data were made with the computed CFD data and the use of Strouhal scaling was found to a feasible method for the modification of airwake data. An offline analysis using a SH60B Seahawk-like helicopter was used to determine the impact of the ship size on the pilot workload. As the ship size increased, so did the levels of predicted pilot workload due to the increasing energy contained within the turbulent wake as the ship size was increased. Copyright © 2014 by the American Helicopter Society International, Inc. All rights reserved.

Keywords:Airships, Computational fluid dynamics, Naval vessels, Ship models, Dynamic interface, Flying quality, Large-scaled datum, Maritime helicopter, Off-line analysis, Pilot workload, Turbulent wake, Wind over decks, Helicopters
Subjects:H Engineering > H410 Aeronautical Engineering
Divisions:Professional services > Vice Chancellors Office
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ID Code:14855
Deposited On:02 Oct 2014 09:13

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