Optimize the average annual cost of a bus fleet has become an increasing concerning in transport companies management around the world. Nowadays, there are many tools available to assist managerials decisions and, one of the most used, is the cost analysis of the life cycle of an asset, known as ''Life Cycle Cost''. Characterized by performing deterministcs analysis of the situation, allows the administration evaluate the process of fleet replacement however is limited by not contemplating certain intrinsic variations related to vehicles and for disregarding variables related to contingencies of fleet use. The main purpose of this study is to develop a combined model of support to asset management based in the association of the Life Cycle Cost tool and the math model of Monte Carlo Simulation, by performing a stochastic analysis considering both, age and average annual mileage, for optimum vehicle replacement. The utilized method was applied in a spanish urban transport fleet and the results indicates that the use of the stochastic model was more effective than the use of the deterministic model.
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