Component fault tree analysis resolves complexity: dependability confirmation for a railway brake system

Authors:
Reiner Heilmann;Stefan Rothbauer;Ariane Sutor
Affiliations:
Siemens Corporate Technology, München, Germany;Siemens Corporate Technology, München, Germany;Siemens Corporate Technology, München, Germany
Venue:
SAFECOMP'07 Proceedings of the 26th international conference on Computer Safety, Reliability, and Security
Year:
2007

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Abstract

In 2006 Siemens Transportation systems had to obtain an operating license for the brake system of a newly developed train. Therefore a safety analysis for the brake system had to be performed to show that the probability of a failure of the brakes is sufficiently small, less than specified limits. The safety analysis was performed by Siemens Corporate Technology. The probability of a failure of the brake system was calculated using hierarchical fault tree analysis. The large number of different combinations of subsystems contributing to failure scenarios was managed by a specially developed program for automatic generation of combinatorial fault trees. The most important result was the proof of the quantitative safety targets of the brake system to the regulating body.