this paper presents a new bridge management system (j-bms). it is integrated with a concrete bridge rating expert system that can be used to evaluate the serviceability of existing concrete bridges. the proposed j-bms not only evaluates the performance of bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. in this ...

The ratio of males to females in a population is a meaningful characteristic of sexual species. The reason for this biological property to be available to the observers of nature seems to be a question never asked. Introducing the notion of historically adapted populations as global minimizers of maintenance cost functions, we propose a theoretical explanation for the reported stability of this...

...................................................................................................................v Acknowledgements ...............................................................................................vii List of appended papers....................................................................................... viii Explanation of some terms .........................

On maintenance optimization for offshore wind farms FRANÇOIS BESNARD Abstract The maintenance cost is known to be an important part of the levelized cost of energy generated by wind parks. Operational costs can be significantly reduced by optimizing decisions for maintenance strategies, maintenance support organization and maintenance planning. This is especially important for offshore wind pow...

Proper maintenance of plant equipment can significantly reduce the overall operating cost, while boosting the productivity of the plant. Therefore Maintenance planning is carried out in a area where the frequent failure occurs. The raw mill section is chosen due to its critical failure nature. The various subsystems of the raw mill system are: air slide, conveyor assembly, impact crusher, separ...

Maintenance of proprietary languages and corresponding tooling is expensive. Postponing maintenance to reduce these costs is an often applied, short-term solution which eventually may lead to an unoperational toolset. This paper describes a case study carried out in cooperation with Lucent Technologies where maintenance cost is decreased by simplifying the development process of languages and t...

Highway Routine Maintenance Cost Estimation for Nevada by Monika Hagood Hualiang (Harry) Teng, Ph.D., Examination Committee Chair Associate Professor of Civil and Environmental Engineering University of Nevada, Las Vegas State highway agencies are obligated to maintain existing roads for the highway systems to work efficiently and with greater longevity. Every year NDOT is responsible for appro...

This thesis deals with the reliability and maintenance of structures that are damaged by shocks arriving randomly in time. The degradation is modeled as a cumulative stochastic point process. Previous studies mostly adopted expected cost rate criterion for optimizing the maintenance policies, which ignores practical implications of discounting of maintenance cost over the life cycle of the syst...

U.S. Class I railways maintain their infrastructure through a mix of ordinary maintenance and periodic renewal of infrastructure components. Different railways use different proportions of ordinary maintenance and periodic renewal with little consensus as to the best combination. Furthermore, the cost-effectiveness of emphasizing one method over the other has not been analyzed using empirical d...

Generating companies use the maintenance cost function as the sole or main objective for creating the maintenance schedule of power generators. Usually only maintenance activities related costs are considered to derive the cost function. However, in deregulated markets, maintenance related costs alone do not represent the full costs of generators. This paper models various cost components that ...