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  • 1.
    Hoseinie, Hadi
    et al.
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Ataie, Mohammad
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Khalookakaei, Reza
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Reliability modeling of hydraulic system of drum shearer machine2011In: Journal of Coal Science and Engineering (China), ISSN 1006-9097, E-ISSN 1866-6566, Vol. 17, no 4, p. 450-456Article in journal (Refereed)
    Abstract [en]

    The hydraulic system plays an important role in supplying power and its transition to other working parts of a coal shearer machine. In this paper, the reliability of the hydraulic system of a drum shearer was analyzed. A case study was done in the Tabas Coal Mine in Iran for failure data collection. The results of the statistical analysis show that the time between failures (TBF) data of this system followed the 3-parameters Weibull distribution. There is about a 54% chance that the hydraulic system of the drum shearer will not fail for the first 50 h of operation. The developed model shows that the reliability of the hydraulic system reduces to a zero value after approximately 1 650 hours of operation. The failure rate of this system decreases when time increases. Therefore, corrective maintenance (run-to-failure) was selected as the best maintenance strategy for it

  • 2.
    Sayed, Hadi Hoseinie
    et al.
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Mohammad, Ataei
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Reza, Khalokakaie
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Reliability and maintainability analysis of electrical system of drum shearers2011In: Journal of Coal Science and Engineering (China), ISSN 1006-9097, E-ISSN 1866-6566, Vol. 17, no 2, p. 192-197Article in journal (Refereed)
    Abstract [en]

    The reliability and maintainability of electrical system of drum shearer at Parvade.1 Coal Mine in central Iran was analyzed. The maintenance and failure data were collected during 19 months of shearer operation. According to trend and serial correlation tests, the data were independent and identically distributed (iid) and therefore the statistical techniques were used for modeling. The data analysis show that the time between failures (TBF) and time to repair (TTR) data obey the lognormal and Weibull 3 parameters distribution respectively. Reliability-based preventive maintenance time intervals for electrical system of the drum shearer were calculated with regard to reliability plot. The reliability-based maintenance intervals for 90%, 80%, 70% and 50% reliability level are respectively 9.91, 17.96, 27.56 and 56.1 h. Also the calculations show that time to repair (TTR) of this system varies in range 0.17̃4 h with 1.002 h as mean time to repair (MTTR). There is a 80% chance that the electrical system of shearer of Parvade.1 mine repair will be accomplished within 1.45 h.

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