Reliability and Life Testing

Subject description

Reliability concepts and reliability data (reliability function, failure rate, repair rate, censoring, repairable systems, nonrepairable units, etc.).

Lifetime distribution models. Parametric models (Exponential, Weibull, Extreme Value, Lognormal, Gamma, Birnbaum-Saunders, etc.).

Repair rate models for repairable systems (homogeneous Poisson process, non-homogeneous Poisson processes).

Failure rates models (competing risk model, series model, the parallel or redundant model, r out of n model, standby model).

Choosing life distribution model, testing model assumptions, estimating parameters (Kaplan-Meier product limit procedure, likelihood ratio tests, maximum likelihood estimations etc.).

Graphical methods (probability plotting of complete data, of single censored data, and of multiply censored data).

Bayesian methods used in reliability (prior and posterior distribution models).

Acceleration test models and life tests (Arrhenius, Eyring, etc.).

The subject is taught in programs

Objectives and competences

To be able to choose the appropriate life distribution model, to test the model assumptions, and to estimate model parameters, to estimate how the quality of the product will change over time.

Teaching and learning methods

Lectures, lab. work, project work.

Expected study results

Students will become familiar with basic reliability concepts, they will get to know various probability models used in life testing and reliability assessment. They will also get to know various acceleration test models and life tests.

Basic sources and literature

Alessandro Birolini, Reliability Engineering: Theory and Practice, 2010.

Linda C. Wolstenholme: Reliability Modelling: A Statistical Approach, Chapman & Hall/CRC, 1999, Reliability: Modeling, Prediction, and Optimization (Wiley Series in Probability and Statistics), 2000.

Patrick D. T. O'Connor: Practical Reliability Engineering, John Wiley & Sons, 2002.

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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana

E: T:  01 4768 411