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dc.contributor.authorEscaler Puigoriol, Francesc Xavier
dc.contributor.authorHutter, J.K.
dc.contributor.authorEgusquiza Estévez, Eduard
dc.contributor.authorFarhat, Mohamed
dc.contributor.authorAvellan, F.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Mecànica de Fluids
dc.date.accessioned2010-10-15T09:53:22Z
dc.date.available2010-10-15T09:53:22Z
dc.date.created2010
dc.date.issued2010
dc.identifier.citationEscaler, X. [et al.]. Modal behavior of a reduced scale pump-turbine impeller. Part I. Experiments. A: IAHR Symposium on Hydraulic Machinery and Systems. "Proceedings 25th IAHR Symposium on Hydraulic Machinery and Systems". Timisoara: 2010, p. 918-926.
dc.identifier.isbn978-606-554-136-8
dc.identifier.urihttp://hdl.handle.net/2117/9717
dc.description.abstractAn experimental investigation has been carried out to quantify the effects of surrounding fluid on the modal behavior of a reduced scale pump-turbine impeller. The modal properties of the fluid-structure system have been obtained by Experimental Modal Analysis (EMA) with the impeller suspended in air and inside a water reservoir. The impeller has been excited with an instrumented hammer and the response has been measured by means of miniature accelerometers. The Frequency Response Functions (FRF’s) have been obtained from a large number of impacting positions in order to ensure the identification of the main mode shapes. As a result, the main modes of vibration have been well characterized both in air and in water in terms of natural frequency, damping ratio and mode shape. The first mode is the 2 Nodal Diameter (ND), the second one is the 0ND and the following ones are the 3ND coupled with the 1ND. The visual observation of the animated mode shapes and the level of the Modal Assurance Criterion (MAC) have permitted to correlate the homologous modes of vibration of the fluid-structure system in air and in water. From this comparison the added mass effect on the natural frequencies and the fluid effect on the damping ratios have been quantified for the most significant modes. With the surrounding water, the natural frequencies decrease in average by 10%. On the other hand, the damping ratios increase in average by 0.5%. In any case, the damping ratio appears to decrease with the frequency value of the mode
dc.format.extent9 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
dc.subjectÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids::Màquines hidràuliques i de fluids
dc.subject.lcshFluid mechanics and its applications
dc.subject.lcshHydraulic turbines
dc.titleModal behavior of a reduced scale pump-turbine impeller. Part I. Experiments
dc.typeConference lecture
dc.subject.lemacMecànica de fluids
dc.subject.lemacTurbines
dc.contributor.groupUniversitat Politècnica de Catalunya. FLUIDS - Enginyeria de Fluids
dc.identifier.doi10.1088/1755-1315/12/1/012116
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac3127215
dc.description.versionPostprint (published version)
local.citation.authorEscaler, X.; Hutter, J.; Egusquiza, E.; Farhat, M.; Avellan, F.
local.citation.contributorIAHR Symposium on Hydraulic Machinery and Systems
local.citation.pubplaceTimisoara
local.citation.publicationNameProceedings 25th IAHR Symposium on Hydraulic Machinery and Systems
local.citation.startingPage918
local.citation.endingPage926


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