Belwind - Structural Health Monitoring (SHM)

When it comes to offshore foundations, dynamic behaviour, scouring, corrosion, reduction in grout and foundation integrity over time, can be problematic. OWI-lab has a mutual R&D partnership with Belwind to perform 'foundation asset monitoring', also named SHM (Structural Health Monitoring) in civil engineering . The Belwind wind farm is located in the North Sea on the Bligh Bank, 46 km off the Belgian coast and consists of 55 Vestas V90-3MW wind turbines placed on monopile foundations. OWI-Lab has been monitoring one of these turbines since 2011 and theirefore has access to unique datasets and knowledge about structural monitoring.

Approach:

The installed foundation monitoring system evaluates several parameters.

• Loads and displacements in the grouted connection

• Vibrations levels on tower and foundation in multiple directions

• Resonance frequencies and damping values of the offshore structure by the
   use of OMA-techniques

• Oxygen levels and corrosion rates inside the monopile foundation
   (in partnership with Zensor)

Link to news articles:

Belwind wind farm and OWI Lab working together on innovative monitoring systems for offshore wind turbines foundations

State-of-the-art and new developments in the field of structural health monitoring

Link to conference posters:

BruWind 2012 conference: "Continuous Operational Modal Analysis (OMA) of an Offshore Wind Turbine"

EWEA Offshore 2013 conference: "Foundation monitoring systems for optimized O&M and lifetime assessment"

EWEA 2014 conference: "Foundation monitoring systems: analysis of 2 years of monitoring at the North Sea"

Design verification of offshore wind turbines for foundation optimization and scour monitoring

Damping of an offshore wind turbine: classification and comparison between simulations and measurements

Monitoring of offshore turbines for design and O&M: an overview of the activities of OWI-Lab