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dc.contributor.authorElfering, Kelsey H.
dc.date.accessioned2018-04-17T22:23:05Z
dc.date.available2018-04-17T22:23:05Z
dc.date.issued2012-08
dc.identifier.urihttp://hdl.handle.net/11122/8308
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2012en_US
dc.description.abstractA cycloidal rotor is characterized by an airfoil span parallel to the axis of rotation. A tensile cycloidal rotor places the airfoils under tensile forces only, thereby attempting to utilize the inertial forces on the rotor to minimize airfoil deflection and overall weight. A prototype rotor was built that meets the micro air vehicle (MAV) size constraint of 15.24 centimeters (6 inches). A new cam path design was used as a pitching mechanism, which reduced overall design weight and mechanical power requirements, and allowed for curved flat plate airfoils and angled airfoil structural supports. The cycloidal rotor was designed to pitch on both sides of the airfoils in an effort to reduce the axial force that was previously observed in mechanisms that pitch straight airfoils using an offset four bar linkage on only one side. The radial and axial strains were measured to determine the forces on the rotor, and compared well with a finite element simulation. The power-to-thrust ratio increased with RPM, which is in contradiction with theoretical rotor predictions. This indicated there are likely inefficiencies due to friction, which is supported by the measured non-zero power requirement at zero RPM.en_US
dc.language.isoen_USen_US
dc.subjectMicro air vehiclesen_US
dc.subjectControl systemsen_US
dc.subjectAutomatic controlen_US
dc.subjectRotorsen_US
dc.subjectCycloidsen_US
dc.subjectAerofoilsen_US
dc.titleInvestigation of a tensile cycloidal rotor and cam cyclic pitching mechanismen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Mechanical Engineeringen_US
refterms.dateFOA2020-03-05T15:12:34Z


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