Safety and reliability of safety monitoring system considering complete and transient failure

Author

Ling, Yuanjin ; Kohda, Takehisa ; Suzuki, Kazuhiko

Author_Institution

Okayama Univ., Japan

Volume

1

fYear

2002

fDate

5-7 Aug. 2002

Firstpage

421

Abstract

This paper studies the reliability and safety of the k-out-of-n:G system as well as its optimal structure among the coherent safety monitoring system composed of n identical sensors. Considering the transient failure and complete failure, when the expected loss caused by fail-safe and fail-dangerous is used as the evaluation criteria of safety, the relationship between reliability and safety is expressed by an analytical formula. It is analyzed mathematically that the high reliability cannot completely guaranty its safety. Further, a simple formula to find the optimal k that can minimize I is obtained. The change of the optimal dynamic logic structure as time of the system elapses is argued. Illustrative examples are given.

Keywords

failure analysis; formal logic; minimisation; monitoring; probability; reliability; safety systems; complete failure; dynamic logic structure; expected loss; fail-dangerous probability; fail-safe probability; minimisation; optimal system; reliability; safety monitoring system; transient failure; Condition monitoring; Failure analysis; Gas detectors; Logic; Protection; Safety; Sensor systems; Transient analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

SICE 2002. Proceedings of the 41st SICE Annual Conference

Print_ISBN

0-7803-7631-5

Type

conf

DOI

10.1109/SICE.2002.1195435

Filename

1195435