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dc.contributor.advisorWood, E. Roberts
dc.contributor.authorTrainer, William T.
dc.dateJun-92
dc.date.accessioned2014-01-29T23:37:46Z
dc.date.available2014-01-29T23:37:46Z
dc.date.issued1992-06
dc.identifier.urihttp://hdl.handle.net/10945/38529
dc.description.abstractThe Department of Aeronautics and Astronautics at the Naval Postgraduate School is involved in an ongoing program of Higher Harmonic Control (HHC) research using Remotely Piloted Helicopters (RPH). To date a host RPH has been acquired and a preliminary HHC design study completed. This thesis reports the results of free vibration shake tests conducted on the host RPH as well as efforts to construct a representative finite element model of the vehicle. Broadband noise was used to excite the structure both laterally and vertically from 10-200 Hz in and attempt to accurately document the airframe and rotor system dynamics. Primary airframe structurl modes were identified in the tail boom and at frequencies well below the characteristic 4/rev (78.3 Hz) main rotor induced vibration frequency. These modes should not be of concern at normal operating rpm. Main rotor blade modes were documented under non-rotating conditions then extended to predict the modes at operating rpm. Finally, a finite element model of the structure was constructed. Difficulties in matching finite element predictions with experimental results, however, will require refinemaents to the computer model before is can become a useful design tool.en_US
dc.description.urihttp://archive.org/details/experimentalndna1094538529
dc.format.extent138 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleExperimental and analytical investigation of the vibration characteristics of a remotely piloted helicopter.en_US
dc.typeThesisen_US
dc.contributor.secondreaderKolar, Ramesh
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentDepartment of Aeronautics and Astronautics
dc.subject.authorHHCen_US
dc.subject.authorModal testingen_US
dc.subject.authorVibrationen_US
dc.subject.authorFinite element analysisen_US
dc.subject.authorRPHen_US
dc.subject.authorShake testingen_US
dc.description.serviceLieutenant Commander, United States Navyen_US
etd.thesisdegree.nameM.S. in Aeronautical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineAeronautical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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