Paper Info
Title
COBAREA: The COpula-BAsed REliability and Availability Modeling Environment
Abstract
Traditional algorithms for the analysis of fault trees (FT) and reliability block diagrams (RBD) are relying on the assumption that there are no dependencies in the failure and repair behavior and thus independence assumptions simplify the calculation. In practice, however, the components of a system are usually not independent. Prominent examples for inter-component dependencies include failures with a common cause (e.g. due to spatial closeness or a shared design), failure propagation, limited repair resources, failures induced by repair, and overload due to failure. Using traditional evaluation techniques implies neglecting these system properties which may lead to over-optimistic results.As an alternative approach to deal with inter-component dependencies, we present a tool based on copulas. Copulas are a way of specifying joint distributions if only the marginal probabilities are known. In terms of system reliability, this can be interpreted as inferring the system state vector probability from the component state probabilities. What makes copulas a valuable modeling method for large reliability models is the separation of the component distributions (the marginals) and the dependencies. Therefore, copulas can be used with arbitrary fault tree evaluation algorithms.
Year
DOI
Venue
2009
10.1109/QEST.2009.22
Budapest
Keywords
Field
DocType
component distribution,inter-component dependency,joint distribution,large reliability model,component state probability,isthe separation,fault tree,system reliability,arbitrary fault tree evaluation,copula-based reliability,availability modeling environment,system state vector probability,availability,software fault tolerance,correlation,fault trees,reliability,copula,redundancy,reliability block diagrams,data mining,systems analysis,graphical user interfaces,maintenance engineering
Reliability block diagram,Mathematical optimization,State vector,Joint probability distribution,Computer science,Copula (linguistics),Copula (probability theory),Software fault tolerance,Real-time computing,Theoretical computer science,Fault tree analysis,Maintenance engineering
Conference
ISBN
Citations 
PageRank 
978-0-7695-3808-2
2
0.41
References 
Authors
0
3
Name
Order
Citations
PageRank
Max Walter1549.17
Sebastian Esch2263.77
Philipp Limbourg3705.58