Transparent reliability model for fault-tolerant safety systems

A reliability model is presented which may serve as a tool for identification of cost-effective configurations and operating philosophies of computer-based process safety systems. The main merit of the model is the explicit relationship in the mathematical formulas between failure cause and the mean...

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Bibliographic Details
Published in:Reliability engineering & system safety 1997, Vol.55 (1), p.25-38
Main Authors: Bodsberg, Lars, Hokstad, Per
Format: Article
Language:English
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Summary:A reliability model is presented which may serve as a tool for identification of cost-effective configurations and operating philosophies of computer-based process safety systems. The main merit of the model is the explicit relationship in the mathematical formulas between failure cause and the means used to improve system reliability such as self-test, redundancy, preventive maintenance and corrective maintenance. A component failure taxonomy has been developed which allows the analyst to treat hardware failures, human failures, and software failures of automatic systems in an integrated manner. Furthermore, the taxonomy distinguishes between failures due to excessive environmental stresses and failures initiated by humans during engineering and operation. Attention has been given to develop a transparent model which provides predictions which are in good agreement with observed system performance, and which is applicable for non-experts in the field of reliability.
ISSN:0951-8320
1879-0836
DOI:10.1016/S0951-8320(96)00113-5