Modal Analysis of a Blade H-type Darrieus Rotor Under the Action of Centrifugal Load and Energy Dissipation in the Material

In this paper, a three-dimensional beam model of the blade is presented, which may help to determine the frequency of the main mode of vibration under centrifugal load, characterized by the highest level of vibration stresses of the two-blade H-type Darrieus rotor. The dependences of the natural frequencies and the decrement of the blade vibrations on the rotational speed of the wind turbine rotor are obtained. The approaches presented in the paper to the modelling of the computational model of the blade in an integral Fourier transform frequency domain allow us to take into account the arbitrary dependence of energy dissipation on the frequency of vibrations under the action of centrifugal load.