Abstract
Shipboard integrated electric propulsion systems (IEPSs) are prone to suffer from system failures and security threats because of their complex functional structures and poor operational environments. An improved assessment method for failure mode and effects analysis (FMEA), integrating fuzzy logic and decision–making trial and evaluation laboratory (DEMATEL) theory, is proposed to enhance the system’s reliability and handle the correlation effects between failure modes and causes. In this method, information entropy and qualitative analysis are synthesized to determine the credibility weights of domain experts. Each risk factor and its relative importance are evaluated by linguistic terms and fuzzy ratings. The benchmark adjustment search algorithm is designed to obtain the alpha-level sets of fuzzy risk priority numbers (RPNs) for defuzzification. The defuzzified RPNs are regarded as the inputs for the DEMATEL technique to investigate the causal degrees of failure modes and causes. Accordingly, the risk levels of the failure modes are prioritized with respect to the causal degrees. The practical application to the typical failure modes of the propulsion subsystem is provided. The assessment results show that this system contributes to risk priority decision-making and disastrous accident prevention.
Highlights
Shipboard integrated electric propulsion systems (IEPSs) can supply power for various loads, such as propulsion system, regional loads, and high-energy weapons
The motivation of this study is to present an improved assessment method for failure mode and effects analysis (FMEA) by combining fuzzy logic and decision–making trial and evaluation laboratory (DEMATEL) theory
In practical applications of the FMEA process, there are common cause failure phenomena and techniques cannot allow for mutual influences between the failure modes and causes
Summary
Shipboard integrated electric propulsion systems (IEPSs) can supply power for various loads, such as propulsion system, regional loads, and high-energy weapons. The application requirements of high–power propulsion and pulse weapon are fulfilled by the –generation medium-voltage DC IEPS for all–electric ships because of its regional power distribution features [3] It has been recognized as one of the most promising power plants because of its remarkable advantages like high power density, small vibration and noise, strong ship vitality and combat effectiveness, and reduced life cycle maintenance costs. Offshore working environments are harsh, usually featuring drastic temperature changes, strong mechanical impacts, and high humidity, accompanied by salt spray and oil mist, as well as other corrosive substances and explosive gases.
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