Classification and analysis of longwall delays

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dc.contributor.authorDunlap, James,1963-en
dc.contributor.committeechairTopuz, Ertugrulen
dc.contributor.committeememberKarfakis, Mario G.en
dc.contributor.committeememberLucas, J. Richarden
dc.contributor.committeememberLuttrell, Gerald H.en
dc.contributor.departmentMining Engineeringen
dc.date.accessioned2014-03-14T21:35:20Zen
dc.date.adate2009-05-02en
dc.date.available2014-03-14T21:35:20Zen
dc.date.issued1990-06-15en
dc.date.rdate2009-05-02en
dc.date.sdate2009-05-02en
dc.description.abstractSpectacular production rates have been achieved by certain U.S. longwalls, and yet a large number of longwall operations have failed to meet anticipated production targets. This study attempts to identify the primary factors which contribute to the production shortcomings of many marginal longwall operations. This study presents details of the classification and analysis of delay data for a group of thirty-nine longwall sections located in the eastern and mid-eastern United States. Downtime data correspondIng to over fourteen-thousand shifts were collected and classified according to equipment type, delay type, and specific delay event. A dBase IV-based database was constructed to allow flexible interrogation of the data. The relative downtime contributions of the various equipment components and of the delay types have been determined. Machine availabilities and system availabilities are presented. Probability density functions have been flit to the time-to-failure and to the time-to-repair data sets, both for the principal equipment types and for the longwall system as a whole. Recommendations are made for increasing the availability of longwall systems.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 259 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-05022009-040545en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05022009-040545/en
dc.identifier.urihttp://hdl.handle.net/10919/42403en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.D866.pdfen
dc.relation.isformatofOCLC# 22397611en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.D866en
dc.subject.lcshLongwall mining -- Researchen
dc.titleClassification and analysis of longwall delaysen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMining Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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