Power and renewables

DNV GL launches new service based on Operational Modal Analysis (OMA) for wind turbines to discover structural problems on wind turbines


New service provides specific insights into the dynamic behaviour of the main components of the wind turbine during regular and unusual conditions.

SPAIN, Madrid, 15th July 15, 2019 - DNV GL, the world’s largest resource of independent energy experts and certification body launched a new service in The Operational Modal Analysis (OMA), also known as ambient modal identification, detects the modal properties of a structure based on vibration data collected when the structure is under its operating conditions. 

As the wind industry strives to cut costs while producing more powerful turbines, traditional designs are being adapted with manufacturers producing taller and slimmer towers with larger blades to optimize production processes and reduce materials to save costs. These design features present new challenges related to structural failures due to vibrations during operation of the turbine.

The new Operational Modal Analysis service will help manufacturers and wind farm owners to understand the dynamic behaviour of the main components of the wind turbine regular and unusual wind conditions. OMA is not only directed to numerical model validation but, as it is based on real measured data. It also helps to identify specific problems that operating wind turbines commonly suffer.

Through the OMA service manufacturers and owners can discover:

  • why their SCADA nacelle vibration signal is frequently triggered
  • how long they can expect their wind turbines to operate without structural risks
  • whether their foundation is stiff enough
  • whether the modal behaviours of the different components of the wind turbine are functioning as expected

“We are continuously working to implement data analysis approaches throughout our services to help our customers gain valuable insights into the behaviour of their assets. This enables DNV GL to project better solutions to each customer according to their specific needs – providing advice on reducing operational costs. We are focused in providing a turn-key service which includes the problem analysis, equipment definition, installation on site, data acquisition, analysis and reporting; everything to make our customer´s life easier” said Santiago Blanco, Director and Area Manager Spain and Portugal and Latin America. 

About DNV GL

The DNV GL measurements department is accredited by ISO 17025, showing our outstanding quality as testing and calibration laboratory. In addition, the IEC 61400-13 accreditation for performing mechanical loads measurements campaigns (for more than 20 years) gives a vast experience installing several kinds of sensors and telemetry systems in every component of a wind turbine, including the selection of accelerometers, their positions and orientations in the tested structure.