Reliability Analysis of a Hydraulic Shovel Used in Open Pit Coal Mines
Keywords:Reliability, Hydraulic Shovel, Time between Failure (TBF), Mean Time to Failure (MTTF), Time to Test (TTT), Increasing Failure Rate (IFR), Decreasing Failure Rate (DFR), Parametric Method.
The paper basically deals on reliability of the hydraulic shovel machines used in coal mines. Reliability of machines defined as the probability of the machine that will carry out its specified function satisfactory for stated period of time and without undergoing failure when used under specified condition for the specified period of time. Reliability of machine depends on its failure, if the failure is frequent then we can say that machine is less reliable and vice-versa. Due to recent deployment of sophisticated and capital intensive mining machinery equipment in mining industry, interest in the field of maintenance and operational reliability has been created. Keeping this in view a reliability investigation is initiated for hydraulic shovel in a reputed mine. The goal is to estimate the operational reliability of these mining machines for coal production in order to enhance its profit. Failure data for period of 1.5 years are analyzed using various probability distribution methods. The importance of testing the reliability data for the presence of trends and serial correlation is also emphasized. The project aimed at analyzing the reliability of the two hydraulic shovel machine using suitable distribution methods and to study the IFR and DFR using TTT-plotting method.
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