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Lecturer(s)
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Filip Aleš, doc. Ing. CSc.
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Course content
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1. Introduction to reliability and safety of systems. Definition of basic terms. 2. Quantitative indicators of reliability and safety. 3. Differences between the concepts of failure frequency, failure rate, failure probability density and failure intensity. 4. Causes of faults and failures. Their types. 5. Failure rate of the system. Multi-channel architectures. Modelling of reliability and safety indicators using time-continuous Markov models. 6. Modelling reliability and safety indicators using discrete-time Markov models. 7. Relation between reliability, availability and safety. The importance of diagnostics. Integrity of safety. Specification of system requirements. Fail-safe principle. Systems with low and high safety function requirements. 8. Control and safety functions. Functional and technical safety. Safety integrity level (SIL) tables in terms of various industry standards. Types of faults and their significance. 9. Techniques for achieving safety in the event of a fault. System life cycle. Principles for determining acceptable risk. Procedure for deriving safety requirements for a system. Verification, validation, proof of safety and certification of the system. 10. System reliability analysis techniques (FTA, ETA, RBD, FMEA, FMECA, HZOP ...) 11. Introduction to cybersecurity in security-relevant systems. 12. Overview of standards for functional safety.
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Learning activities and teaching methods
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Monologic (reading, lecture, briefing), Dialogic (discussion, interview, brainstorming), Demonstration, Work-related activities
- Participation in classes
- 52 hours per semester
- Home preparation for classes
- 30 hours per semester
- Preparation for an exam
- 38 hours per semester
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Learning outcomes
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The aim of the course is to introduce students to the principles of designing reliable and safe electronic systems and to methods of safety evaluation. The course includes the definition of basic concepts, quantitative reliability indicators, causes of faults and failures, modelling reliability and safety using Markov models, functional safety and safety integrity issues, the life cycle of systems, techniques for achieving safety during failure, principles for determining acceptable risk, procedure for deriving safety requirements for a system, explanation of concepts related to proving safety, overview of system reliability analysis techniques (FTA, ETA, RBD, FMEA, FMECA, HZOP, etc.). The final section is devoted to an introduction to cybersecurity in safety-relevant systems, and an overview of functional safety standards in different industrial and transport sectors is given.
Upon completion of the course, the student is proficient in the issues related to the design, implementation and demonstration of reliability and safety in electrical, electronic and programmable electronic systems (E/E/PES). The student is oriented in the issues of risk analysis, specification of safety requirements for the system, safety principles, design of safety functions with the required safety integrity, prevention of failures in the individual stages of the system life cycle and managing the consequences of failures. The student is also introduced to the rationale for performing verification and validation, developing a proof of safety, and certifying safety systems.
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Prerequisites
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The student should know the basics of mathematical analysis, probability theory, Laplace transform, solution of systems of linear differential equations and matrix calculus.
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Assessment methods and criteria
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Oral examination, Written examination, Home assignment evaluation
The student is required to master the basics of mathematical analysis, probability theory, Laplace transform, solving systems of linear differential equations, matrix calculus and programming in the MatLab environment.
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Recommended literature
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CEI EN 50129. Railway applications ? Communication , signalling and processing systems ? Safety related electronic systems for signalling. CEI ? Milano, 2019.
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ČSN EN 61508. Funkční bezpečnost elektrických/ elektronických/ programovatelných elektronických systémů související s bezpečností. Normservis, 2011.
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EN 50126-1. Railway Applications ? The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) ? Part1: Generic. CENELEC Brusel, 2017.
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EN 50126-2. Railway Applications ? The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) ? Part1: Systems. CENELEC Brusel, 2017.
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ISO 26262. Road vehicles - Functional safety. International Standard. ISO: Geneva, 2018.
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Bergmiller, P. J. Towards Functional Safety in Drive-by-Wire Vehicles. Springer, 2015. ISBN 978-3-319-36893-1.
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Filip, A. Elektronická opora k předmětu: Spolehlivost a bezpečnost. 2024.
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Mahboob, Q. and Zio, E. Handbook of RAMS in Railway Systems. Theory and Practice. CRC Press, Taylor & Francis Group, Boca Raton London New York, 2018. ISBN 978-1-138-03512-6.
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Maurer, M., Gerdes, J. Ch., Lenz, B. and Winner, H. Autonomous Driving. Technical, Legal and Social Aspects. Springer Open, 2016. ISBN 978-3-662-48845-4.
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Rausand, M. Reliability of safety-critical systems - Theory and Applications.. John Wiley & Sons Inc, 2014. ISBN 978-1-118-11272-4.
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Ross, H-L. Functional safety for road vehicles. New Challenges and Solutions for E-mobility and Automated Driving. Springer International Publishing Switzerland, 2016. ISBN 978-3-319-33360-1.
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Stapelberg, R. F. Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design. Springer: Vrlag London Limited, 2009. ISBN 978-1-84800-174-9.
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Verma, A., K., Ajit, S. a Karanki, D., R. Reliability and Safety Engineering. 2nd Edition. Springer London, 2016. ISBN 978-1-4471-6268-1.
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