Abstract
In order to avoid the damage of the new type of offshore wind turbine blade (beetle elytron plate blade), it is of great significance to study its dynamic and static stability for the safe operation of the beetle elytron plate blade (BEP blade). In this study, the equivalent model of the beetle elytron plate was proposed to simplify the calculation model of the BEP blade. The static performance of BEP blade under four representative working conditions and its advantages over FRP blades were studied by ANSYS Workbench, and the influence of material type, rotational speed, thickness of skin and web on the dynamic performance of BEP blade was discussed by parametric analysis. The results show that the equivalent plate theory adjusted by dichotomy method is suitable for the equivalence of the cantilevered beetle elytron plate. The first-order natural frequency of BEP blade is more than 1.25 times that of GFRP blade, which is about 43% higher than that of BFRP blade. The natural frequency of the BEP blade generally increases with the increase of the thickness of the skin and web, and the rotational speed and pitch angle has little effect on it. In addition, the pitch and shutdown can significantly reduce the surface stress level of the BEP blade by exerting the bending resistance of the web when the BEP blade under shutdown failure condition. This study provides a reference for engineering design and promotes the application of BEP blade in the field of wind power.
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