In the last years wind turbines have increased dramatically in size so that their structural-dynamic behaviour is becoming progessively more important. Industrial simulation codes for wind-turbine-specifi c problems have some shortcomings in structure modelling, especially for drive trains. This leads to new approaches to wind turbine simulation. The Endowed Chair of Wind Energy at the Institute of Aircraft Design (University of Stuttgart) initiates the usage of SIMPACK for the simulation of wind turbine models. This requires some add-ons to SIMPACK. The most important of these consists of an aerodynamic module to consider rotor aerodynamics and turbulent wind fi eld input.