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dc.contributor.authorRoig Bauzà, Rafel
dc.contributor.authorSánchez Botello, Xavier
dc.contributor.authorJou Santacreu, Esteban
dc.contributor.authorEscaler Puigoriol, Francesc Xavier
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Mecànica de Fluids
dc.date.accessioned2023-09-14T11:40:51Z
dc.date.available2023-09-14T11:40:51Z
dc.date.issued2023-09-08
dc.identifier.citationRoig, R. [et al.]. On the added modal coefficients of a rotating submerged cylinder induced by a whirling motion. Part 1: Experimental investigation. "Journal of marine science and engineering", 8 Setembre 2023, vol. 11, núm. 9, article 1758.
dc.identifier.issn2077-1312
dc.identifier.otherhttps://www.researchgate.net/publication/373791958_On_the_Added_Modal_Coefficients_of_a_Rotating_Submerged_Cylinder_Induced_by_a_Whirling_Motion-Part_1_Experimental_Investigation
dc.identifier.urihttp://hdl.handle.net/2117/393501
dc.description.abstractThe operation of submerged rotating machines, such as marine current or tidal turbines, can present deleterious fluid phenomena that may provoke extreme structural vibrations. To predict their dynamic responses, it is necessary to know the added modal coefficients of their runners under a whirling motion. For that purpose, a bespoke test rig was designed to investigate the added modal coefficients of a submerged cylinder, which could rotate at different speeds both in air and completely submerged in water inside a cylindrical tank. First, the modes of vibration were experimentally measured by exciting the cylinder with a push-release method during steady tests or with ramps in rotating speed during transient tests. The calculated natural frequencies and damping ratios were then used in a mathematical model of the dynamic system to calculate the added modal coefficients. During steady tests, the natural frequencies and damping ratios of the whirling modes changed significantly as a function of the rotating speed. Additionally, a whirling mode was observed to change its direction at a given rotating speed. During transient tests, rotating speed ramps with high accelerations were found to present lower lock-in amplitude and frequencies. Moreover, fast downward ramps presented lock-in amplitudes four times higher than fast upward ramps. Consequently, the added modal coefficients changed accordingly as a function of the rotating speed, ramp acceleration, and ramp direction. For these reasons, it was confirmed that the modal responses of submerged rotating bodies must be calculated for each operational rotating speed, even at low velocities, and for each transient event in order to precisely predict their vibration behaviors.
dc.description.sponsorshipThis research was funded by the European Union’s Horizon H2020 research and innovation program under grant agreement No. 814958.
dc.language.isoeng
dc.publisherMultidisciplinary Digital Publishing Institute (MDPI)
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids::Màquines hidràuliques i de fluids
dc.subject.lcshModal analysis
dc.subject.lcshHydraulic machinery
dc.subject.lcshHydraulic turbines
dc.subject.otherExperimental modal analysis
dc.subject.otherHydraulic machines
dc.subject.otherFluid–structure interaction
dc.subject.otherAdded modal coefficients
dc.subject.otherWhirling motion
dc.subject.otherTransient operation
dc.subject.otherLock-in
dc.titleOn the added modal coefficients of a rotating submerged cylinder induced by a whirling motion. Part 1: Experimental investigation
dc.typeArticle
dc.subject.lemacAnàlisi modal
dc.subject.lemacMàquines hidràuliques
dc.subject.lemacTurbines hidràuliques
dc.contributor.groupUniversitat Politècnica de Catalunya. CDIF - Centre de Diagnòstic Industrial i Fluidodinàmica
dc.contributor.groupUniversitat Politècnica de Catalunya. REMM - Recerca en Estructures i Mecànica de Materials
dc.identifier.doi10.3390/jmse11091758
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.mdpi.com/2077-1312/11/9/1758
dc.rights.accessOpen Access
local.identifier.drac36983042
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/H2020/814958/EU/Active Flow Control system FOR improving HYDRaulic turbine performances at off-design Operation/AFC4Hydro
local.citation.authorRoig, R.; Sanchez, X.; Jou, E.; Escaler, X.
local.citation.publicationNameJournal of marine science and engineering
local.citation.volume11
local.citation.number9, article 1758


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