FOCUS6 Aeroelasticity I, Rotor pre-design

For the aeroelastic pre-design of rotor blades a dedicated module is available. With this module the aeroelastic performance of rotor blades can be determined without the need for a full turbine model or a detailed blade design. This makes it easy to scale up / down an existing blade design and modify it to become the basis for a new blade design.

The Aeroelasticity I module can compute:

  • Quasi-steady rotor characteristics
  • Quasi-steady rotor loads (thrust, torque, blade root bending moment)
  • Eigenmodes and frequencies (including dimensionless aerodynamic damping, direction of the root bending moment, direction of the tip-vibration, amplitude and angle of tip torsional moment)
  • 'Once per rev' varying shape and damping of the rotor blades (including span, flap-wise amplitude of the mode, lag-wise amplitude of the mode, torsional deformation of the mode, blade chord length, aerodynamic damping of the local section)

The Aeroelasticity I module can use either BEM or Vortex Wake model theory as the basis for calculations. The models include torsional deformation and transverse shear flexibility and many aerodynamic and structural dynamic coupling terms for bending and torsion dynamics.

Noise Emission

The noise emission module (requires Aeroelasticity I module) calculates the sound power level of the wind turbine blades and sums it to the overall wind turbine sound power level. For every blade element, trailing edge and inflow noise sources are considered. The trailing edge noise source is calculated from the model of Brooks, Pope and Marcolini. Inflow noise is due to the turbulence in the oncoming flow, interacting with the blade. It is calculated from the model of Amiet and Lowson. The noise sources are ('acoustically') summed over the elements in order to obtain the total blade and turbine sound power level. The output comes in the form of Power Watt Levels (PWL). The Overall PWL (OAPWL) is specified per element to give an overview of the radial distribution of the noise sources. A breakdown is given of the noise source types. Input forms with context help

More information

Download the FOCUS6 brochure (PDF) or contact us if you would like more information.


For inquiries please contact:

Knowledge Centre WMC
Kluisgat 5
1771 MV Wieringerwerf
the Netherlands
phone +31(0)227-50 49 49