Integrating HyperWorks into the Development and Optimisation of Wind Turbine Rotor Blades

For wind turbine rotor blades the mass, the aerodynamic and the loads are highly coupled. The aerodynamic loads are typically calculated using the 2d blade element theory. Additionally the dynamic of the whole system has to be regarded which is determined from stiffness and mass distribution of the blade, gearbox and generator. Both, mass and stiffness are changed during an optimisation of the blade. This leads to an iterative process regarding the aerodynamic loads, the dynamic loads and the structural properties. Besides strength and stiffness constraints also modal and buckling constraints have to be regarded.

It has already been shown that an optimisation using OptiStruct is able to support the design process with objectives like minimal weight or costs. In an enhancement of this optimisation process the pre- and post processing of the optimisation is realised in HyperMesh and HyperView. With macros in HyperMesh the definition of the design variables and the structural constraints can be easily set. Additionally manufacture constraints can be regarded. In HyperView the results are extracted and used for reports. The advantage of this enhancement is a significant decrease of the necessary time for setting up the optimisation and extracting the results.

The Author

Dr. Christoph Katzenschwanz
Wolfgang Kurz
D-85521 Ottobrunn

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