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STABCON Sintesi della relazione

Project ID: ENK5-CT-2002-00627
Finanziato nell'ambito di: FP5-EESD
Paese: Greece

Aeroelastic stability tool for wind turbines

An aeroelastic software (GAST), for the analysis of rotor and rotor-pylon configurations such as wind turbines, helicopters, propeller aircrafts etc. is developed at NTUA.

This tool can be used for:

- the eigen value analysis in vacuum and steady state conditions,
- the stability analysis for time-constant and time periodic conditions,
- time domain aeroelastic simulations.

It consists of a dynamic/structural model based on a multi-body approach, where all flexible bodies are considered as linear beams and a rotor aerodynamics module based on the blade element momentum method. For the discretization of the dynamic equations of motion the finite element method is applied. In the latest version of GAST, the concept of the "aeroelastic element" is introduced.

The dynamic equations of the beam are supplemented by the equations of the ONERA model for the aerodynamic d.o.f (lift, drag and moment). In this way the equations of every beam element, apart from the elastic d.o.f. (elastic deflections and rotations), also include the aerodynamic d.o.f. The complete set of the coupled aeroelastic equations of the beam is solved simultaneously using FEM.

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