Dependability of the Technical Systems

Lecturer:

Antonín Mykiska (gar.)

Tutor:

Antonín Mykiska (gar.)

Synopsis:

Dependability and safety definition. Dependability and safety as a part of quality. Safety of technical objects - definition, legislature, risk analysis, risk management. Dependability managament, control and assurance. Dependability of technical objects during his life cycle. Performance measures of safety, durability, reliability, maintainability and availability, its probability and statistical models. Qualitative and quantitative methods of

dependability analysis (FMEA, FTA, RBD, MA, PC etc.), reliability prediction of systems. Means of systems dependability increasing. Evaluation and control of operational dependability. Dependability information systems

Requirements:

Individual

Syllabus of lectures:

1. Terms quality, product, process, system. Quality management, package of standards ISO 9000:2000. Safety and dependability as a part of the quality. Basic problem groups in partial periods of the life cycle.

2. Safety and dependability definitions in complex and narrow meaning (wickedly by norm IEC). Safety specification in relation to hazard, hazard models, critical failure. Starting-points of the dependability quantification (repaired and non-repaired item; two-state failure model). Probability models for the quantification. Reliability measures of the non-repaired item: I. group - F(t),R(t),f(t), λ(t); II. group - Ts; quantil. Statistical interpretation.

3. Performance measures of safety, durability and shelf life. Maintainability (reparability) - performance measures of the reparability: G(t), g(t), ?(t); To a Tp. Empirical and analytical expression the performance measures. Starting-points of the vote of standard distribution law (ZR) for analytical formularization of the performance measures. Typical shape of the failure rate with three periods, practical consequences: applicability of the Exponential ZR (EZR), for II. period - reliability performance measures of the I. and II. group (implication, waveform).

4. Analytical expression the reliability performance measures (vote ZR) in relation to typical shape of the failure rate: for period I: superposition 2 EZR, for period III. „simultaneously“ EZR and UNZR (Gauss?s distribution). Weibull´s distribution law for description of empirical distribution.

5. Dependability of the repaired items - process renewal: simple, general. Reliability performance measures of repaired item. Availability function A(t) and unavailability function U(t). Availability function A(t) for EZR with λ parameters for reliability and ? for reparability, stable process, asymptotic value A.

6. Life cycle costs. Costs of ownership - undependability (unavailability) part of costs. Availability efforts on costs. Operative availability. Coefficient of technical application. Systems dependability. General procedure of the dependability analysis. Qualitative and quantitative methods of the dependability analysis. Reliability Block Diagram (RBD) method - serial model of RBD (serial failure model).

7. Systems dependability (reliability)- parallel and simple mixed model RBD (redundancy), bridge scheme.

8.Technical viability of the redundancy - redundancy classification. Static redundancy, majority redundancy m of k (2 of 3). Substitution (dynamic, with switching) redundancy - in/partly/out of operation.

9.Resume and appraise of the possibilities and tools of reliability and safety improvement processes (hardware, software, information redundancy). Methods FMEA/FMECA (Fault modes and effects analysis/Fault modes, effects and criticality analysis): basic characteristic, techniques of use, usual application procedure, exploitation the results.

10. Principles and field of using dependability analysis methods: Fault/event tree analysis (FTA/ETA), Markovov Analysis (MA), Method Path County (PC) - forecast of failure rate, Statistic modelling. Example illustrations.

11. Legal responsibility for the safety and dependability. Legal directives, regulations and standards IEC and EN for field of safety. Risks management (analysis, evaluation and risk securing), specific methods of risk analysis: HAZOP, ETA etc.

12. Evaluation of the operating dependability - goals, motivation, contents. Maintainability (preventive maintenance, corrective maintenance), maintenance support. Dependability tests, using forms and methods. Information system for evaluation and control of the operating dependability.

13. Dependability management and its application tools: dependability programs and plans, design review, expose classification for reliability improve, program of the reliability growths etc. IEC standards for field of dependability.

14. Consultations.

Syllabus of tutorials:

only consultation

Study Objective:

Dependability and safety definition. Dependability and safety as a part of quality. Safety of technical objects - definition, legislature, risk analysis, risk management. Dependability managament, control and assurance. Dependability of technical objects during his life cycle. Performance measures of safety, durability, reliability,maintainability and availability, its probability and statistical models. Qualitative and quantitative methods of, dependability analysis (FMEA, FTA, RBD, MA, PC etc.), reliability prediction of systems. Means of systems dependability increasing. Evaluation and control of operational dependability. Dependability information systems

Study materials:

Mykiska, A.: Bezpečnost a spolehlivost technických systémů. Skripta. Vydavatelství ČVUT, Praha 2004 (206 str.), Zákon 102/2001 Sb. o obecné bezpečnosti výrobků, zákon 22/1997 Sb. o technických požadavcích na výroby ve znění zákona 119/2000 Sb., zákon 59/1998 Sb. o odpovědnosti za škodu způsobenou vadou výrobku ve znění zákona 209/2000 Sb.,

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: