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Vol: 53(67) No: 1 / March 2008 Reliability Analysis for Fail Safe Control Systems Development Gianina Gabor Department of Computer Science, University of Oradea, Faculty of Electrical Engineering and Information Technology, 1 Universitatii street, 410087 Oradea, Romania, phone: 0040-259-408769, e-mail: gianina@uoradea.ro Doina Zmaranda Department of Computer Science, University of Oradea, Faculty of Electrical Engineering and Information Technology, 1 Universitatii street, 410087 Oradea, Romania, e-mail: zdoina@uoradea.ro Codruta Vancea Department of Electrical Engineering, Electrical Measurements and Electric Power Use, University of Oradea, Faculty of Electrical Engineering and Information Technology, 1 Universitatii street, 410087 Oradea, Romania, e-mail: cvancea@uoradea.ro Keywords: Failure Mode and Effect Analysis, Fault Tree Analysis, Event Tree Analysis, reliability Abstract The paper focuses on reliability analyzes for the control system of a geothermal power plant. The methods used to analyze system reliability include Failure Mode and Effect Analysis (FMEA), Fault Tree Analysis (FTA) and Event Tree Analysis (ETA) [1]. Investigations started with the construction of the FMEA and continue with FTA and ETA. Analysis regarding reliability and unavailability and other reliability parameters of the control system were made using Isograph FaultTree+ software. The results obtained were discussed and the predicted relevant. References [1] J. P. Bentley, ²Reliability & Quality Engineering², Addison Wesley Longman, 1999, 202 pp. [2] B.S. Dhillon, ²Design reliability², CRC press, 1999. [3] T. L. Dragomir, G. Gabor and A. Korodi, ²On an Active Redundant Structure with k Identically Repairable Components², Proceedings of the 12th International Symposium on Modeling, Simulation and System Identification, SIMSIS 12, Galaţi, pp. 54-60, 2004. [4] M. A. Friedman and J. M. Voas, ²Software Assesment – Reliability, Safety, Testability², John Wiley & Sons, New-York,1995. [5] G. Gabor and O. Gavrilescu, ²Modeling and simulation of the control system of the geothermal power plant from the University of Oradea², Proceedings of CONTI 2000, Timisoara, Romania, pp. 45 – 50, 2000. [6] G. Gabor and O. Gavrilescu, ²Fault Diagnosis in the Control System of a Geothermal Power Plant², Scientific Bulletin of “Politehnica” University of Timişoara, Trans. on A.C.& C.S., vol 47, No.1, pp.111-114, 2002. [7] G. Gabor and E. Vladu, ²Considerations on the simulation of the control system for a geothermal power plant using ASCL and Matlab², Proceedings of EMES’01, Oradea, Romania, pp.24 – 28, 2001. [8] J. Gaffney and M. Lockhead, ²Practical Software and System Availability and Reliability Estimation ², http://www.softwaretechnews.com/ , 2004. [9] H. von Krosigk, ²Functional Safety in the Field of Industrial Automation², Computing and Control Engineering Journal, februarie 2000 [10] Isograph Inc., FaultTree + Software, http://www.isograph-software.com [11] J. W. Vincoli, ²Basic Guide to System Safety.Van Nostrand Reinhold², 1993, 194 pp. [12] B. W. Johnson, ²Design and Analysis of Fault Tolerant Digital Systems², Addison-Wesley Publishing Co., USA, 1989. |