Browsing by Subject "Maintenance management"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Fleet Asset Life Cycle Costing with Intelligent Vehicles
    (Center for Transportation Studies, University of Minnesota, 2008-08) Wyrick, David A.; Erquicia, Santiago
    Life cycle costing seeks to find the optimum economic life of a particular asset considering acquisition, maintenance, operational, and disposal costs over the time it is held. The economic life can vary depending on interest rates, depreciation, maintenance, and overhead. A model was built to calculate economic life cycles for four classes of passenger cars and three classes of motor trucks and truck tractors within Minnesota’s Department of Transportation using data from the M4 information system. For class 330 snowplows in Districts 1 and 6, cost data from M4 regularly were under-reported in comparison to the Minnesota Accounting Procurement System (MAPS) from previous work. Due to high uncertainty of input data integrity in M4, various sensitivity analyses were run. Results included families of cost curves to estimate optimal life cycles for varying cost parameters. A key finding is that data may not be recorded fully, accurately, or assigned to the correct asset, indicating the need for automating as much future data collection as possible. With good data, decision makers can determine how long assets should be kept and maintained in general as a fleet, keeping in mind that results from this model are not indicative of any single unit.
  • Thumbnail Image
    Item
    Remaining Service Life Asset Measure, Phase 1
    (Minnesota Department of Transportation, 2018-07) Kumar, Ravi; Matias de Oliveira, Jhenyffer; Schultz, Arturo; Marasteanu, Mihai
    There is a critical need to use a common metric, such as a service life parameter, across many different types of infrastructure assets. MnDOT has used the remaining service life (RSL) measure for pavement condition for several years and is starting to use it for bridge condition. In this study, researchers examined what has been done to date and what tools and methodologies are available nationally and internationally, and made recommendations on a future measure that can be used to show the "true" condition of the system. First, a literature review was performed to summarize current methods used in asset management and life-cycle cost analyses. A survey was also performed to collect information from agencies around the country. An assessment of current practice used by MnDOT Bridge Office and Materials and Road Research Office was performed next to identify similarities and differences between the two approaches. Based on the information collected, suggestions for a common method were presented and guidelines for a work plan for a follow-up phase 2 were developed.