Comparison of diesel-electric with hybrid-electric propulsion system safety using system-theoretic process analysis

Bolbot, V. and Theotokatos, G. and Boulougouris, E. and Vassalos, D.; (2019) Comparison of diesel-electric with hybrid-electric propulsion system safety using system-theoretic process analysis. In: RINA, Royal Institution of Naval Architects - Power and Propulsion Alternatives for Ships 2019, Papers. Royal Institution of Naval Architects, GBR. ISBN 9781909024878

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Abstract

Cruise ship industry is rapidly developing, with both the vessels size and number constantly growing up, which renders ensuring passengers, crew and ship safety a paramount necessity. Collision, grounding and fire are among the most frequent accidents on cruise ships with high consequences. In this study, a hazard analysis of diesel-electric and hybrid-electric propulsion system is undertaken using System-Theoretic Process Analysis (STPA). The results demonstrate significant increase in potential hazardous scenarios due to failures in automation and control systems, leading to fire and a higher number of scenarios leading to propulsion and power loss in hybrid-electric propulsion systems than on a conventional cruise-ship propulsion system. Results also demonstrate that STPA enhancement is required to compare the risk of two propulsion systems.

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