Study The Dynamic Characteristics Of The Wind Turbine Blade Damping

As a clean and renewable energy, wind energy's reserve is huge. Withthe development of world economy, the wind power industry has achieved rapiddevelopment, and wind turbine is developing in the direction of large scale andhigh efficiency.As a key component capturing wind energy, wind turbine blade'sperformance has a direct impact on efficiency of wind turbine and load that windturbine machine bears. To a large extent it determines the overall performance ofthe unit and economy of developing wind energy. In the large scale developmentprocess of blade, its weight and length increase, while carrying complex loadsinclude gravity loads, inertia loads and unsteady aerodynamic loads, whichmake the blade vibrate complexly. These provide a greater challenge to thedesign of large wind turbine blade. This paper mainly accomplished thefollowing work:1) Give the basic concepts about the history, current situation, prospects,basic theory and blade technology trends of the wind turbine. These wereintroduced to definite the blade configuration feature and the law of theformation to provide a theoretical foundation for three-dimensional modeling ofwind turbine blades.2) Two-dimensional airfoil data was obtained through the airfoil databaseand imported into Profili software to calculate the airfoil lift-coefficient,drag-coefficient, lift-drag ratio and the curve that pitching moment ratio changedwith the angle of attack. Combining with three-dimensional coordinatetransformation theory, three-dimensional airfoil datas were achieced by Matlabsoftware. Those provided a basis for the three-dimensional modeling.3) Three-dimensional model of1.5MW wind turbine blades was obtainedby Pro/E software, which provided a basis for the subsequent finite elementanalysis model.4) Modal analysis and transient dynamic analysis were made for1.5MWwind turbine blade. By dynamic analysis, the vibration characteristics of theblade were analyzed, which provided a reference to enhance the blade vibration resistance.5) Vibration performance of the damping structure blade were analyzed,which were compared with the ordinary blade, and the advantages of dampingstructure blade were analyzed.