The Dynamic Characteristic And Response Analysis Of MW Wind Turbine Blade

Because of the harsh environmental requirements of energy, wind power industry by theclose attention of all countries, wind power technology has made tremendous development,the stand-alone wind turbine capacity has been increased. The growth in the size and capacityof single wind turbine has higher demands for the whole design level in wind turbine industry.When wind turbines operate, the blades rotate around the center axis of rotation, thedeformation of blades to make it around the rotation axis of inertia and weight distributionchanges, which affects the rotation form of the blades. Thus these changes will cause theblade elastic deformation change. Blade rotation and elastic deformation are coupled witheach other, the dynamics of the rotating blades need to consider between the blade rotationand its elastic deformation caused by the dynamic response. Due to the limitation of the filedmeasured data and the difficulty in establishing a complete dynamic wind turbine model, thus,how to simplify the design model and study the dynamic characteristics and response of thewind turbine blades is becoming more and more important.Relying on the national natural science funds: The dynamic characteristic study and lifeanalysis of MW wind turbine blade(51065026)and the state of degradation and failuremechanism of MW wind turbines blades(2011211A002).Dynamic characteristics of largewind turbine blades and its response analysis have been analyzed and studied in this research.In this research, firstly to establish the aerodynamic model of the blade, whereby themodel to calculate the shape parameters of the blades. Using UG three-dimensional modelingsoftware model1.5MW wind turbine blades, to analyze the aerodynamic performance of theblade aerodynamic rated power, wind energy utilization factor.Secondly, finite element discrimination the blade model, to establish the kinematicsequation, the Lagrange equation of blade, the blade unit matrix equation and solving the bladefrequency and modal shape. Define model of blade and fan the remaining part of the model,using Bladed software to simulate all blades, load, torque and the natural frequency of the system.Finally, based on the assumed mode method, establish the dynamic equations of theblades, and analysis the tower and blade modal. Using FAST software on wind turbine bladesunder idling, steady load and gust wind load cases, analysis the dynamic characteristics andresponse, and compared to the results of ADAMS. The correctness of the calculation resultswere verified.