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A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements

Identificadores del recurso

Ocean Engineering 275: 114119(2023)

0029-8018

https://www.sciencedirect.com/science/article/abs/pii/S0029801823005036

http://hdl.handle.net/20.500.12666/904

https://doi.org/10.1016/j.oceaneng.2023.114119

1873-5258

Procedència

(DIGITAL.INTA)

Fitxa

Títol:: A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements
Tema:: PIV; Forces; Frigate; Helicopter recovery
Descripció:: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.; 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.; The authors would like to thank the staff of the Experimental Aerodynamics department of INTA who participated in the tests presented in this paper. This study is included in the“Termofluidodinámica” program 464A 64 1999 14 205 0005 of the Spanish Ministry of Defense with INTA internal code IDATEC S.IGB21001.; Peerreview
Idioma:: English
Autor/Productor:: Matías García, J. C.; Bardera, Rafael; Franchini, Sebastián; Barroso, Estela; Sor, Suthyvann
Editor:: Elsevier
Otros colaboradores/productores:: Instituto Nacional de Técnica Aeroespacial (INTA)
Drets:: © 2023 Elsevier Ltd. All rights reserved.; info:eu-repo/semantics/restrictedAccess
Data:: 2023-12-01T08:00:31Z; 2023-05-23
Tipo de recurso:: info:eu-repo/semantics/article; info:eu-repo/semantics/acceptedVersion; http://purl.org/coar/resource_type/c_6501
Format:: application/pdf

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        <mods:identifier type="citation">Ocean Engineering 275: 114119(2023)</mods:identifier>
        <mods:identifier type="issn">0029-8018</mods:identifier>
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        <mods:identifier type="e-issn">1873-5258</mods:identifier>
        <mods: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.</mods:abstract>
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        <mods:languageTerm authority="rfc3066">eng</mods:languageTerm>
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        <mods:topic>PIV</mods:topic>
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        <mods:subject>
        <mods:topic>Forces</mods:topic>
        </mods:subject>
        <mods:subject>
        <mods:topic>Frigate</mods:topic>
        </mods:subject>
        <mods:subject>
        <mods:topic>Helicopter recovery</mods:topic>
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        <mods:title>A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements</mods:title>
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  1. <dc:title>A comparative analysis of helicopter recovery maneuvers on a SFS by means of PIV and balance measurements</dc:title>
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  3. <dc:creator>Bardera, Rafael</dc:creator>
  4. <dc:creator>Franchini, Sebastián</dc:creator>
  5. <dc:creator>Barroso, Estela</dc:creator>
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  7. <dc:contributor>Instituto Nacional de Técnica Aeroespacial (INTA)</dc:contributor>
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  13. <dc:description>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.</dc:description>
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