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5 [9] Hoseinie, S.H., Ataie, M., Khalookakaei, R., Kumar., U., Ghodrati, B., Reliability analysis of drum shearer machine at mechanized longwall mines. Journal of quality in maintenance engineering, 18(1), (01), PP ! "#$ 0&$ << &'. S [١٠].1386 [11] Kumar. U., Reliability analysis of load-haul-dump machines.phd thesis, Lulea university of Technology, Lulea, Sweden,1990. [1] MIL-STD-173, Reliability Centered Maintenance, Department of Defense, Washington, DC (1986). [13] H. Ascher and H. Feingold, Repairable Systems Reliability: Modeling, Inference, Misconceptions and Their Causes, Marcel Dekker, New York, (1984). [14] Kumar, U., Klefsjo, B., Reliability analysis of hydraulic system of LHD machines using the power law process model. Reliability engineering and system safety, 35(3), 199, PP [15] Dhillon B. S., "Mining Equipment Reliability, Maintainability and Safety", Springer, pp. 09, 008. [16] Gupta A. K., Zeng W., Wu Y., "Probability and Statistical Models Foundations for Problems in Reliability and Financial Mathematics", Springer Science, New York, USA. pp. 78, 010. [17] Kececiyoglu D. B., "Reliability Engineering Handbook" Vol. 1, DEStech Publication, USA, pp: 71, 00. G!=B 0.5 *O' / 1 ;C GH 0 1 # R ;K ;6 ;A/ 6-8 E@8 &';%JA & % & 6 " ; > &.9 &Z > 8? 1,/ 6<& & QJ8 LDM< /&5 "&%# > :9* & =</ =6/ "? 1,/ s 6 -. oh 9@ 50 < Q@R 8 9 Y@5 F K1 & U! KC ;6 ; R 0 1 "@&%# 67 D < QR > e..& %60 < B 6 ;6 /&5 ;@6 &@*& & /&5 "&%# - 0/ &' r < & 67 x.6 $' 67 0/01 ;@6 9@ 0 < Q@R =@ DC 6 "6 9 & / 9@ &@%# J/& & - -.& "@ / _@! ;@S6& &.' "U 0EF> 0 1 # ( 6 / &6 & J5?65 us & & %F "/' < "<6. WU?9. & < ; J < % ' ;& "C K E8 &' ;%JA &.1390! "#$ [] Ivko V. L., Ovchinnikova L. K., Plontnikova V., A Method ofestimating the Operational Reliability of Kinematics Mechanized Support Systems, Soviet Mining Science, 9(3), (1973),PP [3] Walker A. J., Engineering Reliability into AFCs, Mining Technology, 64(736), (198),PP [4] Mason N. S., Monitoring the Reliability of Coal face Equipment, The Mining Engineer, 143(Z64), (1983), PP [5] Mandal S. K., Banik P. K., Evaluation of Reliability Index of Longwall Equipment Systems, Mining Technology, 78(897), (1996), PP [6] Gupta S., Ramkrishna N., Bhattacharya J., Replacement and maintenance analysis of longwall shearer using fault tree technique, Mining Technology, 115(), (006), PP [7] Gupta S., Bhattacharya J., Reliability Analysis of a Conveyor System using Hybrid Data, Quality and Reliability Engineering International, 3, (007), PP [8] Bing-Yuan H., Gang S., Li-Xun K., Reliability emulation of production system on longwall face. Journal of Coal Science & Engineering, 15(1), (009), PP [1] 5

6 Reliability Analysis of powered supports in Tabas Mechanized Coal Mine Amid Morshedlou Department of Mining Engineering, Hamedan University of Technology, Hesam Dehghani Department of Mining Engineering, Hamedan University of Technology, Iran; Seyed Hadi Hoseinie Division of Operation and Maintenance Engineering, LuleåUniversity of Technology, Sweden; Abstract: In this lecture, the reliability of powered supports has been discussed utilizing the gathered failure data and failure interval data from Tabas coal mine in two years. The data sets were investigated using statistical procedures and in two levels: the existence of trend and serial correlation. The results show that the powered supports follow the Gamma reliability function. The reliability of the machine decreases to almost zero after 50 operation hours and after 80 hours the probability of failure of powered supports increases to 60 percent. Powered Support s failure rate shows an improving behavior and therefore decreasing failure rate. In the beginning of the process the failure rate is 0.01 failures per hour, which after a sudden decrease reaches the rate of 0.01, thenceforward on a gently decreasing rate and after 100 hours gets to the rate of Regarding the maintenance policy and to protect the machine s operation continuity, either Preventive maintenance strategy or Corrective maintenance strategy can be chosen. The reliability of the discussed machine can be maintained on a descent level by inspecting and controlling over the parts in short term intervals. Keywords: powered support, Reliability, Failure, Maintenance. ۶

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