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dc.contributor.authorOhanehi, Donatus Chukwubuezeen_US
dc.date.accessioned2014-03-14T21:14:59Z
dc.date.available2014-03-14T21:14:59Z
dc.date.issued1980en_US
dc.identifier.otheretd-06092010-020031en_US
dc.identifier.urihttp://hdl.handle.net/10919/38590
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_US
dc.format.mediumBTDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1980.O425.pdfen_US
dc.subjectRotary percussion drills.en_US
dc.subject.lccLD5655.V856 1980.O425en_US
dc.titleTransfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling systemen_US
dc.typeDissertationen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairMitchell, Larry D.en_US
dc.contributor.committeememberEiss, N. S. Jren_US
dc.contributor.committeememberMcNitt, R. P.en_US
dc.contributor.committeememberJones, J. B.en_US
dc.contributor.committeememberRobertshaw, H. H.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06092010-020031/en_US
dc.date.sdate2010-06-09en_US
dc.date.rdate2010-06-09
dc.date.adate2010-06-09en_US


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