The purpose of this research is to predict the failure of devices using a data mining tool. For this purpose, at the outset, an appropriate database consists of 392 records of ongoing failures in a pharmaceutical company in 1394, in the next step, by analyzing 9 charact More
The purpose of this research is to predict the failure of devices using a data mining tool. For this purpose, at the outset, an appropriate database consists of 392 records of ongoing failures in a pharmaceutical company in 1394, in the next step, by analyzing 9 characteristics and type of failure as a database class, analyzes have been used. In this regard, three decision tree algorithms have been used to determine the most important attributes and to determine the effective rules for the failure. Based on the results obtained from the feature selection of all the three used algorithms, the lifetime characteristics of the machine, the name of the machine and the duration until the last failure are recognized as the most important attributes. On this basis, the life of the device has a very special importance. Since the depreciation in the pharmaceutical industry is high, so the life of the devices used in maintenance and repair has a special effect. In this regard, machines with a life span of more than 20 years are subject to high depreciation and failure, and in addition to the usual repairs they need some special repairs.
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Road construction machinery has considerable importance in construction projects. Among the issues related to machinery, maintenance and repair are very important because maintenance and repairs (machines) are directly related to their costs as well as the overall cost More
Road construction machinery has considerable importance in construction projects. Among the issues related to machinery, maintenance and repair are very important because maintenance and repairs (machines) are directly related to their costs as well as the overall cost of the project. The repair method after the failure is replaced by other maintenance and repair methods that are currently used in many organizations. Reliable Maintenance and Maintenance (RCM) is a process that determines the maintenance and repair needs of equipment and machinery in working conditions so that each of this equipment performs its core tasks in the best possible manner. Instead of concentrating on cost reduction, this method focuses on increasing reliability, which means that costs have been reduced by improving reliability. Reducing maintenance costs is a good and timely maintenance. In this study, a case study of this method has been carried out during a one-year period at Jahad Nasr Sirjan Company and compared with a sample of Sarcheshme Copper Company, which would be acceptable.
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Costs of repair and maintenance are most part of the cost of machinery usage. Cost estimation of repair and maintenance of agricultural machinery is very important for replacement and net return of management of machinery. This is an important factor to present a mathem More
Costs of repair and maintenance are most part of the cost of machinery usage. Cost estimation of repair and maintenance of agricultural machinery is very important for replacement and net return of management of machinery. This is an important factor to present a mathematical model for the cost predication of repair and maintenance. The main goal of research was to present a mathematical model of repair and maintenance cost modern tractors in selected province of Iran. In this case New Holland TM155 and Valtra 8400 tractors were selected in Markazi and Fars provinces. First of all a questionnaire including drivers' information and technical data for the tractors was completed by randomly sampled tractor driver. In this case 100 questionnaires were distributed between users of each type of considered tractors during spring till summer of 2007. Provided data were analyzed by SPSS and Excel soft wares to do statistical analysis and determining appropriate mathematical models. T test was used to mean comparison of tractor’s cost and Z, F and R2 as statistical test and indexes were done to finding appropriate mathematical models. The average annual repair and maintenance costs of New Holland TM155 and Valtra 8400 were calculated 3304 and 3635 Ri/hr respectively. Results showed that the average repair and maintenance costs of Valtra 8400 were significantly higher than New Holland TM155 tractors at 5% confidence level. In this research appropriate mathematical models were offer to estimate repair and maintenance costs of each models.
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