Presenting a method based on PDS model and AHP technique for calculating and analyzing reliability considering the common cause failure for non-uniform components (Case study of the output of the dynamic position stabilization system of a vessel)

Document Type : Original Article

Authors

1 Industrial Engineering, Technical and Engineering, Malek Ashtar University of Technology, Tehran, Iran

2 Industrial Engineering, Technical and Engineering, Payame Noor University, Noor Branch, Noor, Iran

3 Marine Engineering, Engineering, Malek Ashtar University of Technology, Tehran, Iran

Abstract
Reliability and safety of any system is the most important quality characteristic of a system. This qualitative characteristic is of special importance in systems whose operation is under various stresses such as: high temperature, high speed, high pressure, etc. A noteworthy point that is often not taken into account in calculating the reliability and safety of systems is the existence of interdependencies between subsystems with each other, which causes different failures in the system. One of the most important of these failures is common cause failure. In this type of failure, several subsystems or all subsystems fail simultaneously or in a short period of time due to a common cause. Failure to consider common cause failures in calculating the reliability of systems leads to an optimistic estimate of the reliability rate of the system and consequently leads to overconfidence in the system. In this paper, first using the product structure separation techniques (PBS), performance flow block diagram (FFBD) to identify and then using the reliability block diagram (RBD) to calculate and allocate the output reliability of a dynamic positioning system that includes hydraulic thrusters And electric for the movements of roll, suge, sui, yaw and hyo, will be discussed.In calculating the reliability of the system with the help of cascade failure probability rules and with the help of beta factor model and PDS method, common cause failures of different subsystems were considered.

Keywords


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