Monitoring and Failure Diagnosis of a Steel Strip Process

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Keyword: Grey box modelling, Failure detection, Supervision, Steel Industry
Publication year: 1998
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
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This paper deals with condition monitoring and failure diagnosis of a steel strip rinsing process. Modelling and identification of the process is based on a priori knowledge about the process and data from the process. Some parts of the process wear out slowly. It is not possible to measure the wear with any transducers. In the model, the worn parts are modelled explicitly and estimated on-line by an Extended Kalman Filter. The parameter estimation is used for supervision and as an advisory system for the process operators to decide which worn parts should be changed at the next planned stop. In addition to the normal wear, other types of abrupt failures may suddenly occur. It is not possible to detect these failures directly and the failures will give a biased parameter estimate and mislead the process operators into thinking, that a part subject to wear should be changed although it is performing well. Therefore, the condition monitoring system is complemented with a fault detection and diagnosis system, which distinguishes normal wear from sudden abrupt failures.


Björn Sohlberg

Högskolan Dalarna; Elektroteknik
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