| As a clean and renewable energy, wind has a wide prospect of development nowadays. Windturbine, a device facilitates the conversion between wind and electric, was invented to make use of thewind. In this dissertation, research works on the modeling and analysis of the aeroelastic response ofthe horizontal axis wind turbine were carried out. The main contents are as follows:1. Based on the helicopter rotor structural model, general kinematical relations for a beam theorybased on the moderate deflection beam model are established, the Green-Lagrange strain areintroduced to calculate strain-displacement relations.5-node15-degree-of-freedom beam elementswere developed for the discretization of the blades to compute the stiffness and generalized forcematrixes introduced by strain energy. The Hartenberg-Denavit transformation matrix is introduced toderive the position vector in the recursive computational method. A Pre-Curved coordinate frame wasintroduced to describe the profile of pre-curved wind turbine blades in the structual modeling.2. The Suzuki’s dynamic inflow model and the modified Leishman-Beddoes dynamic stall modelwere used to calculate the unsteady aerodynamic loads. A new dynamic stall model based on fuzzylogic was then proposed in the aerodynamic modeling.3. According to the Hamilton principle, nonlinear implicit dynamic equations of wind turbineblades are derived based on generalized force formation on the inertial coordinate frame. The dynamicequations are evaluated using Newmark integration method to get the periodic steady state solution.Then the stability of blades are analysed by Floquet theory.4. Computation examples, which are NREL’s unsteady aerodynamics experiment phase VI, apublished1.5MW wind turbine and a certain1.5MW wind turbine blade, was taken to compare withthe test data and the bladed results. Through The Computational Example, the correctness of themathematic model brought forward in this paper was verified. |
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