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A Modified FMEA Model with Repair Effectiveness Index (REI) Using Fuzzy AHP for Life Support Systems of Space Stations

Conference paper
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Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 778)

Abstract

Failure modes and effects analysis (FMEA) is not being used effectively in Orbital Space Stations (OSS) Environmental Control and Life Support System (ECLSS) maintenance, as a reliability and systems engineering tool to identify and mitigate risks arising due to failures. This paper firstly identifies four important decision criteria relevant to the current maintenance of OSS ECLSS and then determines the importance weights of all these four decision criteria through Pairwise comparisons with the help of Fuzzy Analytic Hierarchy Process (Fuzzy AHP). By using the weight vector of risk factors, the weighted normalized fuzzy decision matrix is constructed. The ranked criteria are then considered as failure modes for an OSS ECLSS and are modeled as repairable systems through Generalized Renewal Process (GRP). This paper then introduces Repair Effectiveness Index (REI) for all the criteria and develops a methodology to estimate RPN by incorporating the element of REI.

Keywords

Failure Modes and Effects Analysis (FMEA) Environmental Control and Life Support System (ECLSS) Fuzzy AHP Generalized Renewal Process (GRP) Repair Effectiveness Index (REI) 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Subir Chowdhury School of Quality and ReliabilityIndian Institute of TechnologyKharagpurIndia

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