Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

The Aeroelastic Stability Tool for Wind Turbines HAWCStab

Vibrations of large flexible wind turbines are highly dependent on its modal properties: Natural frequencies, damping factors and mode shapes. HAWCStab is a tool for computing and analysing these modal properties of a wind turbine at any operation condition with, or without the unsteady aerodynamic forces. The inclusion of the aerodynamic forces enables stability analysis for predicting negative damped aeroelastic modes of the turbine.

The structural model of HAWCStab uses Timoshenko beam elements with six degrees of freedom (DOFs) per node. The aerodynamic forces are assumed to follow a parabolic distribution per element and they are obtained using the BEM method and a modified Beddoes--Leishman dynamic stall model combined with Prandlt's tip correction. The linear equations of motion without periodic coefficients are derived analytically by introducing multi-blade coordinates for the blade DOFs into linearized Lagrange's equations. Because the aeroelastic equations of motion are linear and autonomous, traditional eigenvalue analysis can be performed to obtain natural frequencies, damping, and mode shapes for structural and aerodynamic DOFs.

Reported by

P.O. BOX 49
See on map