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Modeling demand rate and imperfect proof-test and analysis of their effect on system safety

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Title Modeling demand rate and imperfect proof-test and analysis of their effect on system safety
 
Creator KUMAR, M
VERMA, AK
SRIVIDYA, A
 
Subject iec-61508
probability of failure on demand
fail dangerous
fail safe
markov model
markov regenerative process
continuous-time markov chain
proof-test
availability
 
Description Quantitative safety assessment of a safety system plays an important role in comparing design alternatives at design stage and deciding appropriate design options to apply for safety systems. There are a number of such indices given in the literature. Most of the safety indices consider only system parameters (hazard rate, repair rate, diagnosis, coverage, etc.) along with proof-tests (or inspection). This paper extends the underlying model to incorporate demand rate and imperfect proof-tests. It also introduces a new safety index, average probability of failure on actual demand (PFaD), and an availability index, manifested availability (mAv). This paper uses Markov regenerative process-based analysis for state probabilities. Based on state-probability values of various states of the underlying Markov chain, solutions are derived for safety index PFaD and availability mAv. (c) 2008
 
Publisher ELSEVIER SCI LTD
 
Date 2011-07-22T07:59:31Z
2011-12-26T12:52:20Z
2011-12-27T05:39:22Z
2011-07-22T07:59:31Z
2011-12-26T12:52:20Z
2011-12-27T05:39:22Z
2008
 
Type Article
 
Identifier RELIABILITY ENGINEERING & SYSTEM SAFETY, 93(11), 1720-1729
0951-8320
http://dx.doi.org/10.1016/j.ress.2007.12.001
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6159
http://hdl.handle.net/10054/6159
 
Language en