Bladena
  • International Conference 2022
  • Services & Solutions

      Phases

      • Purchase of turbines
      • Commissioning of blades
      • End of warranty
      • Operation
      • Lifetime extension

      Solutions

      • D-String®
      • D-Stiffener™
      • X-Stiffener™
      • D-TE™

      Courses

      • Structural Blade Course

      Tools

      • CAR Tool
      • Blades Data
      • Structural Analysis
      • Elastic instabilities
      • Testing

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  • Cases
  • R&D Projects
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      Who we are

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  • Contact
  • International Conference 2022
  • Services & Solutions

      Phases

      • Purchase of turbines
      • Commissioning of blades
      • End of warranty
      • Operation
      • Lifetime extension

      Solutions

      • D-String®
      • D-Stiffener™
      • X-Stiffener™
      • D-TE™

      Courses

      • Structural Blade Course

      Tools

      • CAR Tool
      • Blades Data
      • Structural Analysis
      • Elastic instabilities
      • Testing

      Downloads

      • All Downloads
  • Cases
  • R&D Projects
  • Who we are

      Who we are

      • About us
      • Management & Board
      • Career
  • News
  • Contact
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D-String®

Simple yet effective

The D-String® may seem simple but is based on many years of research and a highly advanced understanding of why blades fail. It is developed to eliminate cracks in the trailing edge max chord area by eliminating breathing as the root cause.
​
​D-String® will positively affect the operation of your wind turbine
  • Commercially viable solution that eliminates the occurrence of cracks on aging blades
  • Increased anticipated lifetime of blades
  • Secures operation of the blade without added maintenance cost
  • Minimized maintenance time reduces LCoE and increases the profit margin
  • Return on investment is less than 2 years
Picture

Why it works

D-String® eliminates the breathing which occurs when the blades spin. Breathing in turbine blades is caused by edgewise loading due to gravity and induces peeling in the adhesive bondlines near the trailing edge and close to the webs. Peeling in the adhesive bondlines directly causes cracks, which may lead to larger failures in your blades.

Easy installation

​The D-String® can be installed up-tower using simple tools with either rope access, skylift or using a 360 degree platform.
Bladena assists with the installation of the D-Strings® and works with a network of independent service providers who ensure a reliable and cost-effective installation, meeting the highest standards of safety and quality.

Expert opinion

​The D-String® documentation has been reviewed by DEWI OCC who found that: the structural properties and integrity of the blades are not negatively affected by the installation of D-Strings®. The D-String® product does not influence the structural safety of the trailing edge panels of a general rotor blade design.

References

The D-String® is currently  installed on 8 different blade types in Europe and USA:
  • Vestas: V80, V82, V90, V100
  • GE: 34a, 37c
  • LM: 37.3, 45.3
For more details please contact Bladena.

Cases


sample62

D-String® + D-Stiffener™

Custom solution to stop open trailing edge
sample62

D-String®

Stopping crack development without structural repair
© Bladena 2020, Banestrøget 13, 1, 2630 Taastrup
  • International Conference 2022
  • Services & Solutions

      Phases

      • Purchase of turbines
      • Commissioning of blades
      • End of warranty
      • Operation
      • Lifetime extension

      Solutions

      • D-String®
      • D-Stiffener™
      • X-Stiffener™
      • D-TE™

      Courses

      • Structural Blade Course

      Tools

      • CAR Tool
      • Blades Data
      • Structural Analysis
      • Elastic instabilities
      • Testing

      Downloads

      • All Downloads
  • Cases
  • R&D Projects
  • Who we are

      Who we are

      • About us
      • Management & Board
      • Career
  • News
  • Contact