Dissertation > Excellent graduate degree dissertation topics show

Analysis of the Fatigue Life Assessment of Large-scale Wind Turbine Blade

Author: HanYu
Tutor: AnJiangYing
School: North China Electric Power University (Beijing)
Course: Materials Science
Keywords: wind turbine blade fatigue lifetime
CLC: TK83
Type: Master's thesis
Year: 2011
Downloads: 418
Quote: 4
Read: Download Dissertation

Abstract


Blade is a key component of the wind turbine. In the past decade, the wind power electricity has been developing rapidly, with a total installed capacity rising dramatically, and unit capacity increasing.1-2MW has been the main model in market, and 3MW-5MW has been put into operation.The size of wind turbine rotors has increased in the past decade from 40 m to more than 120 m diameter. More than 108 load cycles will happen in the prospected lifetime of 20 years of a turbine. As the blades exposed to various harsh environment, and the effects of various loads, it’s prone to damage, and the fatigue damage is the most important failure modes. It’s of great significance to assess the fatigue of the blade, and the fatigue life assessment is the ultimate aim of fatigue analysis.The complex load conditions on the blades has been analyzed in this paper. The calculation methods of the three main load were summarized in detail. Using the dynamic simulation functions of GH Bladed software, selecting the von Karman turbulent wind model, the normal operating conditions were simulated, and the fatigue load of blade was output. At the same time, the FAST software was used to calculate the fatigue loads of the same wind turbine, the two results are basically similar.The stress analysis function of ANSYS were applied to calculate the stress of the root of blade. Some common S-N curves and empirical models which estimate fatigue limit were introduced, and we selected the exponential function S-N curve as the fatigue life assessment performance curve.Combined the wind speed distribution data determined by Weibull distribution function, the cycles of each of sress determined by the hypothesis that the percentage of wind speed distribution corresponding with the stress cycle, and the cycle life corresponding to each of the stress defined by S-N curve, with Palmgren-Miner linear cumulative injury rules, we calculate the lifetime of the 1.5MW wind turbine blade. The result is 23 years which is similar with design life.The calculation example shows that the lifetime calculation method summarized in this paper is a feasible method.

Related Dissertations

  1. Numerical Study of the Effect with Straight and Bowed Stator in Different Axial Gaps,TH45
  2. Study on Contact Fatigue Life Based on Grease Variation with Temperature,TH117.22
  3. Aerodynamic Performance Analysis of Low Pressure Turbine at Low Reynolds Numbers,V231.3
  4. Lifetime Prediction and Channel Wall Erosion Accelerate Test of Hall Thruster,V439.2
  5. Grid-Side Converter Control and Wind Turbine Emulator in Direct Drive Wind Power System,TM46
  6. The Fatigue State Recognition of the Driver Based on Eye Detection,TP391.41
  7. Investigation on the Nutritional Composition of Walnut and Regularity of Its Nutrient Requirements,S664.1
  8. Axial fan blade vibration non-contact measurement,TD441.2
  9. The Expression of CGRP, OPG in Tibial Tissue of Rat Fatigue Fracture and the Role of Acupuncture Intervention,G804.2
  10. Study on Fatigue Life Assessment and Dynamic Fracture of Ship Structure,U661.4
  11. Dynamic Simulation and Fatigue Durability Analysis of Wheel Loader Worktool,TH243
  12. Research on LEACH-based Clustering Routing Protocol in Sensor Networks,TP212.9
  13. Research on Fatigue Properties of Local 304 Steel and Its Welding Structure,TG457.11
  14. Research and Development of Supercritical, Ultra Supercritical Steel Blade in Benxi Steel,TG335
  15. Analysis on Static-dynamic and Fatigue Characteristics of Metallurgical Overhead Traveling Crane,TH215
  16. Sensor-less Direct Torque Control of Doubly Fed Induction Wind Generator,TM315
  17. Research on High Temperature Mechanical Behavior of Copper Alloy Materials with Aerospace Power Systems,V250.2
  18. The Experimental Research on Reliable Service Life of Toothed Gearing,TH132.41
  19. Study on the Computer Aided Design of Die Forging Blade and Devices,V263.1
  20. Sensitivity Analysis on Fatigue Reliability of a Turbine Disk Using Finite Element Method,V232.3
  21. Fatigue Reliability Sensitivity Analysis and Reliability Robust Design of High Speed Train Wheel,U270.33

CLC: > Industrial Technology > Energy and Power Engineering > Wind energy, wind machine > Wind machinery and equipment
© 2012 www.DissertationTopic.Net  Mobile