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• W3186165927 abstract "This paper presents a fully Bayesian approach for lifetime prediction of anautomotive fleet using real workshop-service data as input. Fleet lifetime prediction is an important issue for the decision-making process in the automotive industry. For instance, fleet lifetime prediction assists engineering teams in monitoring their products under real-life conditions in the field. Furthermore, it provides future cost-projections to the board which thereupon can guide financial support effectively to research and development projects.Also, fleet lifetime prediction plays a key-role in planning spare part pre-production to enable early closing of current productions lines in favor of re-configuring them for new products.The paper explores a problem instance containing more than 170,000 individual vehicles driving in 100 different countries exhibiting a certain failure, pre-selected for this study. The shape of the corresponding lifetime distribution suggests the presence of at least two different mechanisms that lead to failure. This behavior has to be taken into account in the lifetime prediction model, i.e., simple models were not sufficient to describe the lifetime accurately,but more complex mixture models had to be utilized.The suggested lifetime estimator consists of a combination of two probabilistic models. For a given point in time in the future, the first model predicts the effective age of each individual of the fleet. The second model attempts to forecast the total number of failures that will arise for the entire fleet. Both probabilistic models are fully Bayesian, i.e., all parameters of the models are implemented as probability distributions and computations are solely performed on distributions rather than on summarizing statistics. Thus, the predictive output of a Bayesian model is not a point estimate butagain a probability distribution, the so-called posterior predictive distribution (PPD). As a consequence, uncertainty of the predictions is made accessible in a very natural way and can be taken into account in the decision-making processexplicitly. As will be shown in the paper, working with the PPD becomes especially important, or even indispensable, when dealing with decision-making cost-functions that are not symmetric." @default.
• W3186165927 created "2021-08-02" @default.
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• W3186165927 date "2021-06-29" @default.
• W3186165927 modified "2023-10-07" @default.
• W3186165927 title "Bayesian Vehicle Fleet Survival Analysis based onWorkshop-Service Data" @default.
• W3186165927 doi "https://doi.org/10.36001/phme.2021.v6i1.2842" @default.
• W3186165927 hasPublicationYear "2021" @default.
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