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Non-Linear Dynamic Characteristics Analysis of Megawatt Horizontal Axis Wind Turbine Blade

Author: ChuShiMing
Tutor: CaoDengQing
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: Wind turbine blade Aeroelastic theory Nolinear vibration multi-scale method vibration analysis
CLC: O322
Type: Master's thesis
Year: 2009
Downloads: 90
Quote: 0
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Abstract


It gets more attention since wind turbine is the main form of the use of wind energy, aerodynamic characteristics of the blade is the key of the operation of wind turbines. Blade of the horizontal axis wind turbine as elastomeric in the operation as a result of coupling of aerodynamic, elastic and inertial force gives rise to unstable vibration, which is usually the main reason of structural damage of wind turbine. The problem of blade aeroelastic stability has been concerned by people. So far, the main research results are concentrated in the design of wind turbine blades, the linear stability analysis. But non-linear model is still not systemic and perfect. The research work of involving non-linear stability analysis and stability margin analysis of blade is still rare.In this paper,a wind turbine of a particular model of a domestic wind turbine manufacturers is taken as a typical sample. According to the knowledge of aerodynamic, the simplified mathematical model of nonlinear of blade is established. And the principal parametric resonance, 1/2 and 1/3 subharmonic parametric resonance are analyzed. The dissertation is organized as following:1、The main geometric parameters of the wind turbine blade are introduced. According to the aerodynamic properties of blade, the momentum-element theory and a series of amendments method to the eddy current, the aerodynamic force of blade unit is derived.2、By simplifying the blad model and the introduction of reasonable assumptions, the nonlinear dynamic model for transverse vibration is derived. Combining with the results of the aerodynamic analysis of blade, simple nonlinear dynamic model of the blade with a single degree-of-freedom is deduced.3、The multi-scale method is used more systematic and comprehensive to deal with several contingent non-linear dynamical phenomena of blade. Including the principal parametric resonance, 1/2 and 1/3 subharmonic parametric resonance are analytical obtained and the amplitude-frequency characteristic curves of steady-state response are arrived at. And the amplitude-frequency characteristic is analyzed by changing parameters.Through the above research work, more systematic and complete nonlinear dynamic model of the horizontal axis wind turbine blade can be deduced. And a number of nonlinear dynamical phenomena of blade are understood. It has a very important role in guiding to develop appropriate control strategies.

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CLC: > Mathematical sciences and chemical > Mechanics > Vibration theory > Nonlinear vibration
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