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Modal Analysis of Pressures on a Full-Scale Spinnaker

hal.structure.identifierInstitut de Recherche de l'Ecole Navale [IRENAV]
dc.contributor.authorDEPARDAY, Julien
hal.structure.identifierInstitut de Recherche de l'Ecole Navale [IRENAV]
dc.contributor.authorBOT, Patrick
hal.structure.identifierInstitut de Recherche de l'Ecole Navale [IRENAV]
dc.contributor.authorHAUVILLE, Frédéric
hal.structure.identifierInstitut de Recherche de l'Ecole Navale [IRENAV]
dc.contributor.authorAUGIER, Benoît
hal.structure.identifierFluides, automatique, systèmes thermiques [FAST]
dc.contributor.authorRABAUD, Marc
hal.structure.identifierUniversity of Auckland [Auckland]
dc.contributor.authorMOTTA, Dario
hal.structure.identifierUniversity of Auckland [Auckland]
dc.contributor.authorLE PELLEY, David
dc.date.accessioned2021-05-14T09:42:18Z
dc.date.available2021-05-14T09:42:18Z
dc.date.issued2016-04
dc.date.conference2016-04
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/76722
dc.description.abstractEnWhile sailing offwind, the trimmer typically adjusts the downwind sail "on the verge of luffing", letting occasionally the luff of the sail flapping. Due to the unsteadiness of the spinnaker itself, maintaining the luff on the verge of luffing needs continual adjustments. The propulsive force generated by the offwind sail depends on this trimming and is highly fluctuating. During a flapping sequence, the aerodynamic load can fluctuate by 50% of the average load. On a J/80 class yacht, we simultaneously measured timeresolved pressures on the spinnaker, aerodynamic loads, boat and wind data. Significant spatio-temporal patterns are detected in the pressure distribution. In this paper we present averages and main fluctuations of pressure distributions and of load coefficients for different apparent wind angles as well as a refined analysis of pressure fluctuations, using the Proper Orthogonal Decomposition (POD) method. POD shows that pressure fluctuations due to luffing of the spinnaker can be well represented by only one proper mode related to a unique spatial pressure pattern and a dynamic behavior evolving with the Apparent Wind Angles. The time evolution of this proper mode is highly correlated with load fluctuations. Moreover, POD can be employed to filter the measured pressures more efficiently than basic filters. The reconstruction using the first few modes allows to restrict to the most energetic part of the signal and remove insignificant variations and noises. This might be helpful for comparison with other measurements and numerical simulations.
dc.language.isoen
dc.source.titleThe 22th CHESAPEAKE SAILING YACHT SYMPOSIUM
dc.titleModal Analysis of Pressures on a Full-Scale Spinnaker
dc.typeCommunication dans un congrès avec actes
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]
bordeaux.page13
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.countryUS
bordeaux.title.proceedingThe 22th CHESAPEAKE SAILING YACHT SYMPOSIUM
bordeaux.conference.cityAnnapolis
bordeaux.peerReviewedoui
hal.identifierhal-02143204
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02143204v1
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