Browsing by Author "Lehtonen, Juuso"

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  • Nosturikomponenttien vikaantumisen ennustaminen ja luotettavuus
    (2010) Lehtonen, Juuso
     School of Electrical Engineering | Master's thesis
    Maintenance planning of crane require all estimate or a prediction on components' failures. In this thesis, different methods for predicting are considered. Prediction is discussed in more detail in a situation where there are no measurements from components. Since it is impossible to know exactly when a component will fail probabilities have to be considered. Most common probability distributions and their features are presented. In addition, stresses effecting on components and how they could be taken into account in calculating the component reliability is discussed. Parameter estimation methods least-square and maximum likelihood are presented. The latter has the advantage that it can be used with censored data. In the thesis Bayesian inference is also discussed and how it can be used to take advantage of previous knowledge for updating the model. Finally, the reliability model for an example component is created based on expert opinions.
  • Monimuuttujajärjestelmien säätökonfiguraatiot
    (2009) Lehtonen, Juuso
     Elektroniikan, tietoliikenteen ja automaation tiedekunta | Bachelor's thesis