Foundation structural health monitoring of an offshore wind turbine—a full-scale case study

In this contribution, first, the results in the development of a structural health monitoring approach for the foundations
of an offshore wind turbine based on its resonance frequencies will be presented. Key problems are the operational and
environmental variability of the resonance frequencies of the turbine that potentially conceal any structural change. This
article uses a (non-)linear regression model to compensate for the environmental variations. An operational case-by-case
monitoring strategy is suggested to cope with the dynamic variability between different operational cases of the turbine.
Real-life data obtained from an offshore turbine on a monopile foundation are used to validate the presented strategy
and to demonstrate the performance of the presented approach. First, the results indicate an overall stiffening of the
investigated structure.