Reduction of energy losses: a key to improved rock drilling?

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dc.contributor.authorOhanehi, Donatus Chukwubuezeen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:37:15Zen
dc.date.adate2010-06-08en
dc.date.available2014-03-14T21:37:15Zen
dc.date.issued1975en
dc.date.rdate2010-06-08en
dc.date.sdate2010-06-08en
dc.description.abstractThe viscous power losses of a rotary-vibratory drilling system are estimated in this study. Rotational and pure vibratory losses are considered separately. This analysis indicates that considerable power is dissipated into the drilling fluid. Pure vibratory power losses of over 3,728 W (5 hp) are expected at frequencies equal to the first mode maximum response point for a drill column that is 152.4 m (500 ft) long. This is a frequency slightly less than the first undamped natural frequency of the drill column. For the same column, viscous rotational power losses of over 74.56 W ( 0.1 hp) are expected at rotational speeds of 10.47 rad/s (100 rpm). Rotational and vibratory losses increase with increases in the length of the column, fluid viscosity, and operating frequency.en
dc.description.degreeMaster of Scienceen
dc.format.extentviii, 108 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06082010-020314en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06082010-020314/en
dc.identifier.urihttp://hdl.handle.net/10919/42936en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1975.O35.pdfen
dc.relation.isformatofOCLC# 39019788en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1975.O35en
dc.titleReduction of energy losses: a key to improved rock drilling?en
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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