Transfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling system

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dc.contributor.authorOhanehi, Donatus Chukwubuezeen
dc.contributor.committeechairMitchell, Larry D.en
dc.contributor.committeememberEiss, Norman S. Jr.en
dc.contributor.committeememberMcNitt, R. P.en
dc.contributor.committeememberJones, J. B.en
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:14:59Zen
dc.date.adate2010-06-09en
dc.date.available2014-03-14T21:14:59Zen
dc.date.issued1980en
dc.date.rdate2010-06-09en
dc.date.sdate2010-06-09en
dc.description.abstractThis research develops transfer matrix model for the longitudinal vibratory component of a rotary-vibratory drilling (RVD) system driven with an electrohydraulic inertial mass exciter. The RVD system is a hybrid drilling system consisting of a conventional rotary drilling system assisted by forced harmonic vibrations. The model includes a drill string with continuously distributed inertia, stiffness, internal material, and external fluid damping. These properties were introduced through a new continuum transfer matrix for a damped pipe element. The model allows for the inclusion of realistic geometrical representations for the drill string, and the inclusion of masses, springs, dashpots, and other axial structural elements. The force exerted on the drill string by the drilling fluid was included using the theory of a flat plate oscillating in a newtonian fluid. The force had an inertia and a viscous damping component. These were incorporated into the inertia and external fluid damping terms in the new continuum transfer matrix. The exciter had force and power limits. The rock-rock bit boundary was represented as a structurally damped spring.en
dc.description.degreePh. D.en
dc.format.extentxxi, 246 pages, 2 unnumbered leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06092010-020031en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06092010-020031/en
dc.identifier.urihttp://hdl.handle.net/10919/38590en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1980.O425.pdfen
dc.relation.isformatofOCLC# 06674914en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1980.O425en
dc.subject.lcshRotary percussion drillsen
dc.titleTransfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling systemen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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