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- Kumar, Uday
(författare)
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Availability studies of load-haul-dump machines
- 1989
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Ingår i: Application of computers and operations research in the mineral industry. - : Society for Mining, Metalurgy and Exploration. - 0873350790 ; , s. 323-335
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Konferensbidrag (refereegranskat)abstract
- This paper presents details of an availability study for a fleet of diesel engine operated load-haul-dump (LHD) machines used in a Swedish mine. The LHD machines have been considered as a system comprised of many subsystems like engine, brake, trnsmission, etc., in series. The concepts of maintainability are also discussed. The need for exploring the data for the presence of any structure, which is very common in repairable system data sets, is emphasized with suitable examples. Simple graphical techniques are used for verifying the independent and identically distributed (IID) assumption for the data set. The error introduced due to the use of the exponential distribution in place of more appropriate distributions in estimation of availability and reliability characteristics is analysed.
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| 5. |
- Kumar, Uday, et al.
(författare)
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Reliability investigation for a fleet of load haul dump machines in a Swedish mine
- 1989
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Ingår i: Reliability Engineering & System Safety. - : Elsevier BV. - 0951-8320 .- 1879-0836. ; 26:4, s. 341-361
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Tidskriftsartikel (refereegranskat)abstract
- The recent trends of deployment of complex and capital intensive equipment in mines has created interest in the field of maintenance and operational reliability of this equipment. The failure consequences associated with random equipment failures have considerable influence on the total operating cost of a highly mechanized mining system. Keeping this in view, a reliability investigation was initiated for a fleet of diesel operated load-haul-dump (LHD) machines in a Swedish mine. The goal is to estimate the operational reliability of these machines, locate items or assemblies which need improvement in design to enhance the reliability and to decide the duration of optimal preventive maintenance. Failure data for one year of LHD machines are analysed using the recently developed graphical technique of total time on test (TTT) plotting. Analytical methods like Kolmogorov-Smirnov test and maximum likelihood estimation are used in the analysis. The importance of testing the reliability data for the presence of trends and serial correlation is also emphasized.
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| 6. |
- Kumar, Uday, et al.
(författare)
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Truck maintenance at the Aitik copper mine
- 1989
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Ingår i: International Journal of Surface Mining, Reclamation and Environment. - : Informa UK Limited. - 1389-5265 .- 1744-5000. ; 3:4, s. 181-186
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Tidskriftsartikel (refereegranskat)abstract
- The operation and maintenance activities are integrated to a greater extent at Aitik to enhance the total productivity of the mine. The area of maintenance is identified as a strategic cost center by the Aitik management for cost control. This paper discusses the maintenance practice, the organizational set up, the achivements and the maintenance strategy for the coming years for the Transport Division of the Aitik mine.
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