Browsing by Author "Ribeiro, Alexandre Borges de Oliveira"
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- A general-purpose tool for reliability and availability analysis of repairable systemsPublication . Ribeiro, Alexandre Borges de Oliveira; Geraldes, Carla A.S.; Obal, Thalita Monteiro; Almeida, João P.; Nuñez, David LiraThis thesis covers general mathematical and simulation models for the reliability and availability analysis of repairable systems along with estimation methods and model selection criterion. A combined mathematical and simulation model called the Failure-Repair Process is proposed, based on the trend-renewal process. This model is based on a binary state system, where the system may only be in one of two states: working or failed. This model is then integrated into a general-purpose tool, for automated modelling of repairable systems. The classical Akaike information criterion is used to automate the choice of failure and repair models that best fit the available data. Estimators for different performance measures of the systems are studied, such as point and mean availability, rate of occurrence of failures and a first order reliability estimator based on the Kaplan-Meier estimator. Numerical studies are conducted in the proposed non-analytical estimators for the availability, leading to a robust mean availability estimator and a intuitive but sample demanding point availability estimator. Furthermore, a complete quantitative study is conducted on real data from the food industry together with a presentation of the implemented tool functionalities. Overall, the proposed model is able to adapt very well to real data with different characteristics, and, consequently, the resulting performance indicators are befitting to practice.