An integrated approach to fault diagnosis for a class of chemical batch processes.pdf

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An integrated approach to fault diagnosis for a class of chemical batch processes.pdf

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An integrated approach to fault diagnosis for a class of chemical batch processes

Journal of Process Control 19 (2009) 827–841Contents lists available at ScienceDirect Journal of Process Control journal homepage: www.elsevier .com/ locate/ jprocontAn integrated approach to fault diagnosis for a class of chemical batch processesq F. Caccavale *, F. Pierri, M. Iamarino, V. Tufano Dipartimento di Ingegneria e Fisica dell’Ambiente, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Basilicata, Italya r t i c l e i n f o Article history: Received 6 February 2008 Received in revised form 29 October 2008 Accepted 1 November 2008 Keywords: Fault diagnosis Adaptive observers Chemical batch reactors0959-1524/$ - see front matter 2008 Elsevier Ltd. A doi:10.1016/j.jprocont.2008.11.003 q This work is supported by Università degli Studi d Ricerca scientifica di interesse locale. * Corresponding author. Tel./fax: +39 0971 205198 E-mail addresses: fabrizio.caccavale@unibas.it (F. unibas.it (F. Pierri), mario.iamarino@unibas.it (M. Iam bas.it (V. Tufano).a b s t r a c t This paper deals with the problem of fault diagnosis for a class of chemical reactions taking place in a jacketed batch reactor. An integrated diagnosis scheme, using redundant temperature measurements and a bank of state observers, is adopted to detect, isolate and identify faults. A unified framework is developed to take into account faults affecting sensors, actuators and process. Redundant sensor mea- surements, together with the estimates provided by two isolation observers, are processed by a Decision Making System, providing information about the faulty sensor as well as healthy measurements. Then, healthy measurements are processed by a bank of adaptive observers, aimed at detecting, isolating and identifying actuator and process faults. In order to test the effectiveness of the approach, a detailed simulation case study is developed. 2008 Elsevier Ltd. All rights reserved.1. Introduction In chemical processes several kinds of failures may compromise