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Maximising profit is an important target for industries in a competitive world and it is possible to achieve this by improving the system availability. Engineers have employed many techniques to improve systems availability, such as adding redundant devices or scheduling maintenance strategies. However, the idea of using such techniques simultaneously has not received enough attention. The authors of the present paper recently studied the simultaneous optimisation of system design and maintenance strategy in order to achieve both maximum availability and minimum cost: the Non-dominated Sorting Genetic Algorithm II (NSGA-II) was coupled with Discrete Event Simulation in a real encoding environment in order to achieve a set of non-dominated solutions. In this work, that study is extended and a thorough exploration using the above-mentioned Multi-objective Evolutionary Algorithm is developed using an industrial case study, paying attention to the possible impact on solutions as a result of different encodings, parameter configurations and chromosome lengths, which affect the accuracy levels when scheduling preventive maintenance. Non-significant differences were observed in the experimental results, which raises interesting conclusions regarding flexibility in the preventive maintenance strategy.

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A new integrated system with the capacity to help minimize the coastal environmental impacts when a pollutant load is discharged into the sea, in particular oil spills, is presented. The system, named SAMM, integrates simulation models (oil spills, dumping of sewage, brine, etc.) and risk assessment tools for decision-making in emergency situations so as to minimize the environmental and socio-economic impact of marine spills. The main core modules of the integrated system are: Monitoring and Data, Simulations and Risk Analysis. The present system has been developed by an interdisciplinary team that has worked on many previous projects in the field and recently received a national award. This paper describes the modelling implemented in the integrated system and shows examples of real applications in coastal areas and seas.