Modelling and Controlling Reliability of a Maintenance System using Casual Loop
Pegah Basirat, Hamed Fazlollahtabar
1 Department of Industrial Engineering, Mazandaran University of Science and Technology, Babol, Iran
2 Faculty of Industrial Engineering, Iran University of Science and Technology, Tehran, Iran
Measuring the reliability of a maintenance system is a crucial issue, in which the system reliability could be one of the essential performance indicators to evaluate whether the system is capable or not. The objective of this study is to develop a novel approach for reliability assessment in a maintenance system. Due to the dynamic nature of this system, the concept of system dynamics is employed to determine and analyze its most critical elements, structural characteristics, relationships and feedbacks with respect to reliability. Therefore, series of casual loop diagrams assisting in better understanding of casual influences of maintenance system are developed. The casual loop diagrams plotted here provide a tool for management to hypothesize the dynamic influencing effectiveness of maintenance management, particularly the impact on reliability indices. Then, cumulative sum control chart (CUSUM) being analyzed as a visual objective to determine performance accuracy is considered. In addition, the ability of the CUSUM schemes to detect important types of changes in the optimal reliability indices are analyzed. As a result, these discussions would help system administrators to have better perception and use quantified indices to configure the reliability index in maintenance systems.
maintenance; reliability; casual loop; CUSUM