High-fidelity Modeling of Local Effects of Damage for Derated Offshore Wind Turbines

The Science of Making Torque from Wind 2014

Richards, Phillip W.^1 ; Griffith, D. Todd^2,3 ; Hodges, Dewey H.^1,2

Daniel Guggenheim School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150, United States^1

AIAA, Sandia National Laboratories, Albuquerque, NM 87123, United States^2

Department of Energy's National Nuclear Security Administration, United States^3

关键词: 3D finite element model;    Displacement and stress;    Effect of operations;    High fidelity analysis;    Off-shore wind power;    Operations and control;    Sandia National Laboratories;    Virtual crack closure technique;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012036/pdf
DOI  :  10.1088/1742-6596/524/1/012036

来源: IOP

【 摘 要 】

Offshore wind power production is an attractive clean energy option, but the difficulty of access can lead to expensive and rare opportunities for maintenance. As part of the Structural Health and Prognostics Management (SHPM) project at Sandia National Laboratories, smart loads management (controls) are investigated for their potential to increase the fatigue life of offshore wind turbine rotor blades. Derating refers to altering the rotor angular speed and blade pitch to limit power production and loads on the rotor blades. High- fidelity analysis techniques like 3D finite element modeling (FEM) should be used alongside beam models of wind turbine blades to characterize these control strategies in terms of their effect to mitigate fatigue damage and extend life of turbine blades. This study will consider a commonly encountered damage type for wind turbine blades, the trailing edge disbond, and show how FEM can be used to quantify the effect of operations and control strategies designed to extend the fatigue life of damaged blades. The Virtual Crack Closure Technique (VCCT) will be used to post-process the displacement and stress results to provide estimates of damage severity/criticality and provide a means to estimate the fatigue life under a given operations and control strategy.