The SNMREC Preferred Partner Program is an opportunity for our industry partners to collaborate more fully with the Center. This program is designed to dedicate SNMREC experts and resources to individual industry partner development needs.
Publication TR-10-221
Reference: Sloan, J.C., T.M. Khoshgoftaar, and H. Hanson, 2010: Formalizing fault trees for remote ocean systems. Proceedings, 16th International ISSAT on Reliability and Quality in Design, 5-7 August, 2010, International Society of Science and Applied Technologies, 324-328. ISBN: 978-0-9763486-6-5.
Abstract: Real time condition-based evaluation of system health must not only be efficient, but also produce usable and expressive results. To this end, this paper presents a settheoretic formulation of fault trees. Such a formulation provides a usable scaffolding on which ensembles of machine health measurement techniques may eventually operate. Initially, we present a negation-free formulation of a forest of fault trees as aset of 2-level sum-of-products expressions. Given this formulation, we express measures for certainty and specificity, both of which further qualify the various well-studied measures for severity. This formulation is subsequently refined to represent multistatesystems, non-coherent valuations, and node sharing – all necessary for practical monitoring solutions. Finally, we present an evaluation rule embodying these refinements and analyze its complexity. Examples pertaining to unattended ocean systems illustrate these concepts.
