KhouzestanRamin Agriculture and Natural Resources University

Mollasani, Iran

KhouzestanRamin Agriculture and Natural Resources University

Mollasani, Iran

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Najafi P.,University of Tabriz | Najafi P.,KhouzestanRamin Agriculture and Natural Resources University | Asoodar M.A.,KhouzestanRamin Agriculture and Natural Resources University | Marzban A.,KhouzestanRamin Agriculture and Natural Resources University | Hormozi M.A.,KhouzestanRamin Agriculture and Natural Resources University
Agricultural Engineering International: CIGR Journal | Year: 2015

The performance of agricultural machines depends on the reliability of the machinery used, the operating environment, the maintenance efficiency, the operating process, the technical expertise of the farmers, etc. As the size and complexity of farm equipment continue to increase, the implications of equipment failure become over more critical. Therefore, reliability analysis is required to identify the bottlenecks in the system and to find the components or subsystems with low reliability for a given designed performance. It is important to select a suitable method for data collection as well as for reliability analysis. This paper presents a case study describing reliability and availability analysis of the sugarcane 7000 series chopper harvester at Hakim Farabi agro-industry in Iran. In this study, the harvester is divided into nine subsystems. The parameters of some probability distributions, such as weibull, exponential and lognormal distributions have been estimated by using ReliaSoft Weibull++6 software. The results of the analysis show that feed rollers and hydraulic subsystems are critical in reliability point, and the wheels subsystem and hydraulic subsystem are critical in an availability point of view. The study also shows that the reliability analysis is very useful for deciding maintenance intervals. © 2015, Int. Comm. of Agricultural and Biosystems Engineering. All rights reserved.


Afsharnia F.,KhouzestanRamin Agriculture and Natural Resources University | Asoodar M.A.,KhouzestanRamin Agriculture and Natural Resources University | Abdeshahi A.,KhouzestanRamin Agriculture and Natural Resources University | Marzban A.,KhouzestanRamin Agriculture and Natural Resources University
Agricultural Engineering International: CIGR Journal | Year: 2014

The use of tractors for agricultural works showed an important role to mechanized agricultural sector. A repairable mechanical system (as agricultural tractor) is subject to deterioration or repeated failure. In this study, the regression model was used to predict the failure rate of MF399 tractor. The machine failure pattern was carefully studied and key factors affecting the failure rate were identified in five regions of Khouzestan province. The tractors grouped in four sub groups according to annual use hours and maintenance policies (corrective maintenance and preventive maintenance). Results showed that the majority of recorded failures were observed in the electrical system (20.3%) for each machine sub-group. Maximum and minimum annual repair and maintenance costs were related to other (tire, ring, ball bearing and operator seat) and brake system respectively. According to the results of the research, different annual use hours and maintenance policies affected failure rate. The tractors included in 300-1,000PM subgroup were mostly in the useful life period while the machines were towards the wearing out period of machine life for 300-1,000CM subgroup. The tractors maintained under 1,200-2,000PM subgroup showed an obvious indication of wear-out period entrance, while the tractors were mostly in the wear-out period for the 1,200-2,000CM sub group. The tractors included in 300-1,000 annual use hours were commonly in a randomized breakdown period during their useful life but these tractors tend to enter the wear out period in the 1,200-2,000 annual use hours. So, annual use hours were more effective on failure rate in comparison with maintenance policies. © 2014 Int. Comm. of Agricultural and Biosystems Engineering. All rights reserved.

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