Currently corrective maintenance and time-based preventive maintenance strategies are widely used in wind power industry. However, few methods are applied to optimize these strategies. This paper aims to develop opportunistic maintenance approaches for an entire wind farm rather than individual components that most of the existing studies deal with. Furthermore, we consider imperfect actions in...

Offshore wind turbine blades suffer from various faults such as blade angle asymmetry, icing, and bends. Replacement of rotor blades normally involves heavy transportation (e.g., vessel and crane), and dependency on weather conditions. As a result, wind turbines come to a long standstill and costs on energy production increase. One approach to reducing the downtime and costs is to apply a prope...

The Internet and WEB pervasiveness are changing the landscape of several different areas ranging from information gathering/managing and commerce to software development, maintenance and evolution. Traditionally, phone-centric services, such as ordering of goods, maintenance/repair intervention requests and bug/defect reporting, are moving towards WEB-centric solutions. This paper proposes the ...

Wind farms have gained wide attention due to unlimited resources and clean energy. Considering that wind turbine systems are always in harsh conditions, subsystem failures could reduce the reliability of systems. At present, maintenance behaviors for various (e.g., corrective maintenance, preventive maintenance) when is reduced below threshold. cost downtime, it impossible repair each component...

Maintenance is the main instrument to assure system quality service over time, despite of ageing and wearing of its components. The entire set of the maintenance actions (inspections, replacements, repair, refuelling etc.) carried out on a system during its operational life can be classified into preventive and corrective actions. The former are all those actions performed on the system accordi...

In this paper, we develop reliability and conditionbased maintenance models for a multi-component system of stents implanted in human arteries that is subject to both delayed and instantaneous failures. Considering the physics of failure and probability of failure, we develop a system-level reliability model and maintenance strategy by merging fracture mechanics and stochastic process approache...

The maintenance of transport vehicles represents an important aspect of the operating costs of a TPL (local public transport) company. This work analizes the programmed and corrective maintenance procedures of a recent tram fleet. Starting from machine shop’s data, after a careful technical and economic analysis, a set of two models has been developed in order to forecast and point out time and...

The maintenance of a single unit system that alternates operating and idle periods is studied. In the former case the failures are detected as soon as they occur and only by special testing or inspection in the latter. This paper aims at minimizing the cost per unit of time for an infinite time span by selection of a unique interval, for both inspection and maintenance. A special feature of thi...

The concept of stochastic-based accuracy and its calculation procedure for the case of corrective maintenance in data reconciliation-based systems were recently presented [Bagajewicz, M. (2005b). On a new definition of a stochastic-based accuracy concept of data reconciliation-based estimators. In: Proceedings of the 15th European symposium on computer-aided process engineering; Bagajewicz, M.,...

A predictive-maintenance structure for a gradually deteriorating single-unit system (continuous time/continuous state) is presented in this paper. The proposed decision model enables optimal inspection and replacement decision in order to balance the cost engaged by failure and unavailability on an infinite horizon. Two maintenance decision variables are considered: the preventive replacement t...