FUNCTIONAL SAFETY ASSESSMENT: AN ISSUE FOR TECHNICAL DIAGNOSTICS

Marcantonio Catelani, Lorenzo Ciani, Valentina Luongo

Abstract

The paper discusses a case study concerning the functional safety assessment based on the evaluation of the Safe Failure Fraction (SFF) for a complex system. Being such evaluation made according to IEC61508 standard, the paper focused on some related ambiguities. The paper is structured in two phases. First, a reliability prediction of each component of the system is implemented and then a Failure Mode and Effect, Diagnostic Analysis (FMEDA) is applied, in order to collect information about failure condition of each component. By using this approach it is possible to study SFF of different complex systems in compliance with qualitative requirements described in the aforementioned standard.

Keywords

safety related system, IEC 61508, safe failure fraction, failure mode and effect, diagnostic analysis

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IMEKO-WC-2012-TC10-O6.pdf

DOI

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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