In this article, we study the assessment of the reliability of redundant systems with imperfect fault coverage. We term fault coverage the ability of a system to isolate and correctly accommodate failures of redundant elements. For highly reliable systems, such as avionic and space systems, fault coverage is in general imperfect and has a significant impact on system reliability. We review here...

This study is concerned with the performance modeling of a fault tolerant system consisting of operating units supported by a combination of warm and cold spares. The on-line as well as warm standby units are subject to failures and are send for the repair to a repair facility having single repairman which is prone to failure. If the failed unit is not detected, the system enters into an unsafe...

This paper deals with the Reliability analysis of K-out-of-n : G redundant system in the presence of Lethal & Non-lethal Common Cause Shock failures (CCS) along with imperfect fault coverage. S.Akhtar (1994) has discussed the reliability analysis of k-out-of-n: G redundant system with Perfect and imperfect fault coverage and derived Reliability measures namely Rs (t), As (t), MTTF, MTBF. K.Mall...

This paper presents an efficient approach based on OBDD for the reliability analysis of a multi-state system subject to imperfect fault-coverage with combinatorial performance requirements. Since there exist dependencies between combinatorial performance requirements, we apply the Multi-state Dependency Operation (MDO) of OBDD to deal with these dependencies in a multi-state system. In addition...

The work presents a dynamic Bayesian networks (DBN) modeling of series, parallel and 2-out-of-3 (2oo3) voting systems, taking account of common-cause failure, imperfect coverage, imperfect repair and preventive maintenance. Seven basic events of one, two or three component failure are proposed to model the common-cause failure of the three-components-systems. The imperfect coverage is modeled i...

Retrial systems have been used extensively to model many practical problems in call center, data cloud service computing center and computer network system. This paper deals with a multi-server retrial system the features of imperfect coverage delay reboot. In investigated system, arrivals may not be detected because some fault issues. When this situation happened, is cleared by reboot operatio...