Abstract
This article describes a case study using a fault tree analysis for a multi-operational-state system (system with several operational states) model with many different technical solutions for the power system of a fishing vessel. We describe the essence of system dependability metamodeling. A vector of external events was used to construct a detailed metamodel, depending on the operational status being modeled. In a fault tree, individual external events modify the structure of a system. The analysis includes the following operational states: sea voyages of a vessel, hauling in and paying out nets, trawling, staying in a port, and heaving to. For each operational state and assumed system configurations, the importance of system components was determined by calculating the Vesely–Fussell measures. The most important components for each operational state of a system were determined, and the critical system components, that is, those that are important in every operational state and system configuration, were identified.
Highlights
System structures often significantly change under different operating conditions
The presented models allow for the analysis of reliability and availability of the systems in different combinations of component structure and for different operational states, as shown by the example of the power system of a fishing vessel
The example presented in this article shows that the proposed methodology using a fault tree as a system metamodel enables a holistic analysis of the reliability of multi-operational-state systems and/or systems with many different technical constructions
Summary
System structures often significantly change under different operating conditions. These conditions are associated with switching certain system components on or off, depending on the demand for functions of these components in a given operational state [1,2,3]. There are different ways to model time-variant reliability structures, for example, using graphs, tables, reliability block diagrams, fault trees, and so forth [4,5,6,7]. Many complex technical systems are composed of similar or identical (analogous) basic components. Examples of such systems are ship’s power systems [23,24,25]. Depending on the size of ship, its intended use, and the specific construction, these systems may vary considerably [26]
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