The experimental determination of rotor blade dynamic bending moments of a 10-kw wind turbine

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dc.contributor.authorHendricks, David Gerarden
dc.contributor.committeechairMoses, Hal L.en
dc.contributor.committeememberO'Brien, Walter F. Jr.en
dc.contributor.committeememberVaughan, David H.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:34:03Zen
dc.date.adate2009-04-18en
dc.date.available2014-03-14T21:34:03Zen
dc.date.issued1991-05-05en
dc.date.rdate2009-04-18en
dc.date.sdate2009-04-18en
dc.description.abstractA l0-kW horizontal axis wind turbine was studied to determine the effects of wind shear and gravity on rotor blade bending moments. A drag sphere based wind measuring system was designed to measure rapid fluctuations in wind velocity at two different heights. However, severe power line noise problems with the low level signals forced the use of standard rotating cup anemometry. Rotor blade bending moments were obtained with strain gages mounted on blade extenders near the root of the instrumented blade. Rotor angular position data were obtained with a photocell arrangement. The one per revolution primary bending moment frequency was caused mostly by gravity-induced bending. Also present is the 6 Hz blade natural frequency. A logarithmic atmospheric boundary layer (ABL) profile was used to estimate wind conditions at the upper level. Examination of the bending moment data revealed good agreement with values predicted from the ABL profile (within 4% in the mean) indicating the profile was a good mean approximation. A logarithmic atmospheric boundary layer (ABL) profile was used to estimate wind conditions at the upper level. Examination of the bending moment data revealed good agreement with values predicted from the ABL profile (within 4% in the mean) indicating the profile was a good mean approximation.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 93 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04182009-041114en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04182009-041114/en
dc.identifier.urihttp://hdl.handle.net/10919/42128en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.H474.pdfen
dc.relation.isformatofOCLC# 24111900en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.H474en
dc.subject.lcshRotors -- Researchen
dc.titleThe experimental determination of rotor blade dynamic bending moments of a 10-kw wind turbineen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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