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FMECA assessment for railway safety-critical systems investigating a new risk threshold method
Department of Information Engineering, University of Florence, via di S. Marta 3, 50139, Florence, Italy.
Department of Information Engineering, University of Florence, via di S. Marta 3, 50139, Florence, Italy.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics. Industry and Transport Division, Tecnalia Research and Innovation, Miñano, Araba , 01510, Spain.ORCID iD: 0000-0002-4107-0991
Department of Information Engineering, University of Florence, via di S. Marta 3, 50139, Florence, Italy.
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2021 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 9, p. 86243-86253Article in journal (Refereed) Published
Abstract [en]

This paper develops a Failure Mode, Effects and Criticality Analysis (FMECA) for a heating, ventilation and air conditioning (HVAC) system in railway. HVAC is a safety critical system which must ensure emergency ventilation in case of fire and in case of loss of primary ventilation functions. A study of the HVAC’s critical areas is mandatory to optimize its reliability and availability and consequently to guarantee a low operation and maintenance cost. The first part of the paper describes the FMECA which is performed and reported to highlight the main criticalities of the HVAC system under analysis. Secondly, the paper deals with the problem of the evaluation of a threshold risk value, which can distinguish negligible and critical failure modes. Literature barely considers the problem of an objective risk threshold estimation. Therefore, a new analytical method based on finite difference is introduced to find a univocal risk threshold value. The method is then tested on two Risk Priority Number datasets related to the same HVAC. The threshold obtained in both cases is a good tradeoff between the risk mitigation and the cost investment for the corrective actions required to mitigate the risk level. Finally, the threshold obtained with the proposed method is compared with the methods available in literature. The comparison shows that the proposed finite difference method is a well-structured technique, with a low computational cost. Furthermore, the proposed approach provides results in line with the literature, but it completely deletes the problem of subjectivity.

Place, publisher, year, edition, pages
IEEE, 2021. Vol. 9, p. 86243-86253
Keywords [en]
Failure analysis, HVAC, Railway safety, Reliability, Risk analysis
National Category
Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
URN: urn:nbn:se:ltu:diva-85636DOI: 10.1109/ACCESS.2021.3088948ISI: 000673118500001Scopus ID: 2-s2.0-85117614667OAI: oai:DiVA.org:ltu-85636DiVA, id: diva2:1568979
Note

Validerad;2021;Nivå 2;2021-07-28 (beamah)

Available from: 2021-06-18 Created: 2021-06-18 Last updated: 2021-12-14Bibliographically approved

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Galar, Diego

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