hrvatski

Utjecaj dijagnostike na pouzdanost i sigurnost procesnih kontrolera

The paper aims at analyzing the influence of diagnostics and redundancy on the improvement of reliability and safety of the control equipment of the ship electrical engines. Safety, reliability and availability of the system are important requirements when designing the control equipment. If diagnostics and redundancy are not built in the system, any engine failure may lead to a gradual decrease of the system safety. The conception of self diagnostics and diagnostics, possibilities of its application on different system structures, as well as its influence on the reliability and safety of the control system, and consequently on the overall ship’s electric power plant reliability and safety are analyzed. The analysis is carried out from two aspects: first, we have used the combined modelling techniques to estimate the improvement of reliability and safety when redundancy is included in the system ; and, secondly, we have used the Markov’s model to research into the safety aspect of two architectures for the design of a redundant diagnostic system. The procedure enables the evaluation of potential solutions by means of which the ship’s electric power plant can operate with more suitable fault tolerance. The influence of the quality of diagnostics on these solutions has been also analyzed.

diagnostic ; ship’ s electric power plant ; reliability ; safety ; fault-tolerant

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