Effect of Different Workscope Strategies on Wind Turbine Gearbox Life Cycle Repair Costs

Alan Lesmerises and David Crowley
Publication Target: 
Publication Issue: 
Special Issue Wind Turbine PHM
Submission Type: 
Full Paper
ijphm_13_017.pdf264.64 KBAugust 8, 2013 - 12:43pm

The wind turbine industry is beginning to establish orthodoxies governing the repair of gearboxes, including policies governing the replacement of bearings during gearbox heavy maintenance events. Some maintainers recommend replacing all of the bearings, every time, regardless of condition or age. At the same time, others prefer to only replace the failed bearing. The former rationale achieves availability by spending more money than absolutely necessary; the latter sacrifices reliability in exchange for a lower shop visit cost. Even though neither approach results in the lowest Life Cycle Cost, no standard practice has yet been implemented to methodically determine what would be the best approach. Furthermore, as gearboxes approach the end of their planned service lives, a different strategy may be called-for. This paper presents an example of using a reliability-based statistical analysis to determine which strategy will yield the lowest Life Cycle Cost for wind turbine gearboxes.

Publication Year: 
Publication Volume: 
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Page Count: 
Submission Keywords: 
life cycle cost
Submission Topic Areas: 
CBM and informed logistics
Economics and cost-benefit analysis
Modeling and simulation
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