Lifetime Extension Assessment

Task 42 Report

This report documents the state-of-the-art procedures in the life assessment and life extension
of wind turbines in a wind farm and thereby the missing elements required in the procedures
used currently are delineated.

Recent literature on the topic of life extension, remaining life assessment, reliability and
inspection methods is reviewed. Simulation based methods and inspection based methods are
addressed separately. The specific topics covered in this document are:
– Assessment of remaining life of wind turbine structures, components
– Physics based methods in the design process to evaluate fatigue
– Type of measurement data, time duration of recording
– Types of simulations of the turbine possible
– Inspections methods and what to inspect
– Probability of detection of damage
– Remote monitoring versus physical inspections
– Uncertainties in the process of lifetime extension

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