Abstract
Hydraulic steering systems are vital for safe and efficient navigation in maritime vessels. Failures in these systems can pose serious operational and safety risks. This study uses fuzzy Failure Modes and Effects Analysis to assess risks in a four-ram hydraulic steering system commonly used in ships. A total of 47 failure modes of the hydraulic system were identified and analyzed using domain expert input to improve the accuracy of the risk assessment. Fuzzy input and output variables are developed, followed by the construction of membership functions, a rule base, and an inference engine to compute the Fuzzy Risk Priority Numbers (FRPN). Based on the calculated FRPN values, all failure modes are ranked, with the top ten highlighted and detailed in the Discussion chapter, which concludes with recommendations for control and prevention. It was found that the most critical failure mode is “insufficient system pressure” due to defective hoses, pipes, and connectors (FRPN 6.59). The results of this study provide practical benefits to the maritime industry by enabling more precise risk identification and mitigation strategies. This approach facilitates effective maintenance scheduling, enhances system reliability, reduces operational downtime and maintenance costs, and ultimately improves the safety and efficiency of ship navigation systems.
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