Wind Blade Material Optimization

2011 ◽  
Vol 66-68 ◽  
pp. 1199-1206
Author(s):  
Samir Ahmad ◽  
Izhar-ul-Haq
Keyword(s):  
Wind Turbine ◽  
Structural Integrity ◽  
Rotor Blades ◽  
Dust Particles ◽  
Element Analysis ◽  
Composite Blade ◽  
Material Optimization ◽  
Finite Element Analysis Simulation ◽  
The Subject ◽  
Future Direction

In recent years the wind turbine blade has been the subject of comprehensive study and research amongst all other components of the wind turbine. As our appetite for renewable energy from the wind turbine continues to increase, companies now focus on rotor blades which can go up to 80m in length. The blade material not only have to face large aerodynamic, inertial and fatigue loads but are now being designed to endure environmental effects such as Ultraviolet degradation of surface, accumulation of dust particles at sandy locations, ice accretion on blades in cold countries, insect collision on blades and moisture ingress. All this is considered to ensure that the blades complete its designated life span. Furthermore exponential increase in composite blade manufacturing is causing a substantial amount of unrecyclable material. All these issues raise challenges for wind blade material use, its capacity to solve above mentioned problems and also maintain its structural integrity. This paper takes on this challenge by optimizing from the properties, merits, demerits and cost of different possible competing materials. Then the material is checked for its structural integrity through Finite Element Analysis simulation using standards like IEC-61400-1.This paper also shows the future direction of research by elaborating the influence nanotechnology can have in the improvement of the wind blade.

Acoustic Techniques for Wind Turbine Blade Monitoring

2007 ◽  
Vol 347 ◽  
pp. 639-644 ◽  
Author(s):  
Kenneth Burnham ◽  
Gareth Pierce
Keyword(s):  
Wind Turbine ◽  
Structural Integrity ◽  
International Energy Agency ◽  
Rotor Blades ◽  
Wind Generation ◽  
Energy Agency ◽  
Wind Turbine System ◽  
Acoustic Techniques ◽  
The Uk ◽  
Electrical Generation

The total electrical generation capacity from wind sources in the International Energy Agency (IEA) Wind Member Countries has increased from 4 GW in 1995 to more than 51 GW in 2005 thus underlining the strategic importance of the resource. In the last year alone the UK increased its wind generation by 447 MW, an increase of 85% over that for the previous year. In 2004, wind generation formed just 0.5% of the national electric demand; this contribution is set to rise over the next few years with some predictions that wind energy will rise to 8% of the total UK demand by 2010. The rotor blades of a wind turbine system are a significant structural component of the overall system, and typically account for 30% of lifecycle costs, and contribute 34% to overall system downtime. Despite their importance, there is currently very little monitoring of the structural integrity of rotor components, and what does exist is limited. We perceive that especially with the current political and technological emphasis on offshore installations, there will be an increase in the perceived need for remote structural monitoring, and there is indeed currently great interest in this area from the wind turbine industry. This work focuses on the applications of acoustic techniques to assess the integrity of typical rotor blade structures. Preliminary results discuss the limiting aspects of acoustic based techniques based on the physics of acoustic wave propagation in typical structural components. Comparisons between acoustic emission approaches and conventional active ultrasound will be considered.

scholarly journals Vibration and Modal Analysis of Low Earth Orbit Satellite

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Asif Israr
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Integrity ◽  
Center Of Mass ◽  
Low Earth Orbit ◽  
Element Analysis ◽  
Satellite Structure ◽  
Modeling And Analysis ◽  
Material Optimization ◽  
Theoretical Predictions

This paper presents design, modeling, and analysis of satellite model used for remote sensing. A detailed study is carried out for the design and modeling of the satellite structure focusing on the factors such as the selection of material, optimization of shape and geometry, and accommodation of different subsystems and payload. The center of mass is required to be kept within the range of (1-2) cm from its geometric center. Once the model is finalized it is required to be analyzed by the use ofAnsys, a tool for finite element analysis (FEA) under given loading and boundary conditions. Static, modal, and harmonic analyses inAnsysare performed at the time of ground testing and launching phase. The finite element analysis results are also validated and compared with the theoretical predictions. These analyses are quite helpful and suggest that the satellite structure does not fail and retains its structural integrity during launch environment.

Analysis of Various Materials for Service Platform in Wind Turbine Generator

2015 ◽  
Vol 766-767 ◽  
pp. 534-538
Author(s):  
V. Sriram
Keyword(s):  
Wind Turbine ◽  
Structural Integrity ◽  
Ansys Software ◽  
Turbine Generator ◽  
Element Analysis ◽  
Service Platform ◽  
Wind Turbine Generator ◽  
Structural Support ◽  
The Finite Element Analysis ◽  
The Cost

Wind Turbine Industry is always seeking to improve and better its product options to its customers. One way of doing so is by bettering and optimizing its existing product offerings. The structural support component of a Wind Turbine Generator, which is approximately 15% of the total wind turbine cost and includes the tower and rotor yaw mechanism. It is possible to both discreetly increase the strength of the platforms and reduce its overall cost in terms of material costs by selecting suitable alternate material. The new platform is tested for stability under practical loading conditions by the Finite Element Analysis (FEA) using ANSYS software. The aim of the project is to minimize the cost and weight of the Service platform by 15-18% without compromising on its structural integrity interfaces.

scholarly journals Wind Turbine Aeroelastic Modeling: Basics and Cutting Edge Trends

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Mesfin Belayneh Ageze ◽  
Yefa Hu ◽  
Huachun Wu
Keyword(s):  
Wind Turbine ◽  
Geometric Nonlinearity ◽  
Cutting Edge ◽  
Control Methods ◽  
Future Directions ◽  
Structure Interaction ◽  
Smart Control ◽  
The Subject ◽  
Future Direction

The interaction of fluid flow and the structure dynamic of the system is a vital subject for machines operating under their coupling. It is not different for wind turbine either, especially as the coupling enhanced for multi-MW turbine with larger and flexible blades and complex control methods, and other nonlinearity, more comprehensive aeroelastic tools will be required to investigate the realistic phenomena. The present paper will overview the aeroelastic tool for wind turbine, the efforts done, gaps, and future directions indicated. One starts with background of the subject, presenting a case study to demonstrate the effect of fluid-structure interaction considering NREL 5MW blade and a brief comparison of several aeroelastic codes. Cutting edge efforts done in the area such as complex inflow, effect of geometric nonlinearity, and other stability and smart control issues are addressed and concluded by elaborating the gaps and future direction of aeroelasticity of wind turbine.

Structural analysis of offshore wind turbine blades using finite element method

2019 ◽  
Vol 44 (2) ◽  
pp. 168-180 ◽  
Author(s):  
Hicham Boudounit ◽  
Mostapha Tarfaoui ◽  
Dennoun Saifaoui ◽  
Mourad Nachtane
Keyword(s):  
Finite Element ◽  
Wind Energy ◽  
Wind Turbine ◽  
Structural Integrity ◽  
Renewable Energy Sources ◽  
Turbine Blades ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Wind Turbine Blades ◽  
Element Analysis

Wind energy is one among the most promising renewable energy sources, and hence there is fast growth of wind energy farm implantation over the last decade, which is expected to be even faster in the coming years. Wind turbine blades are complex structures considering the different scientific fields involved in their study. Indeed, the study of blade performance involves fluid mechanics (aerodynamic study), solids mechanics (the nature of materials, the type of solicitations …), and the fluid coupling structure (IFS). The scope of the present work is to investigate the mechanical performances and structural integrity of a large offshore wind turbine blade under critical loads using blade element momentum. The resulting pressure was applied to the blade by the use of a user subroutine “DLOAD” implemented in ABAQUS finite element analysis software. The main objective is to identify and predict the zones which are sensitive to damage and failure as well as to evaluate the potential of composite materials (carbon fiber and glass fiber) and their effect on reduction of rotor’s weight, as well as the increase of resistance to wear, and stiffness.

scholarly journals Analysis of Modal Parameters Using a Statistical Approach for Condition Monitoring of the Wind Turbine Blade

2020 ◽  
Vol 10 (17) ◽  
pp. 5878 ◽  
Author(s):  
Lukasz Dolinski ◽  
Marek Krawczuk
Keyword(s):  
Wind Turbine ◽  
Turbine Blades ◽  
Primary Objective ◽  
Rotor Blades ◽  
Mode Shapes ◽  
Wind Turbine Blades ◽  
Horizontal Axis Wind Turbine ◽  
Bending Vibrations ◽  
Low Frequencies ◽  
Composite Blade

The primary objective of the presented paper is the numerical and experimental investigation related to developing a useful diagnostic method, which can be used for determining the site and size of damage in laminated shells of wind turbine blades. The described detection technique is based on the analysis of low frequencies bending vibrations mode shapes of rotor blades. The authors used the commonly applied statistics methods that have been adapted to detect edges of damage, including the normalized determination coefficient fit, which is a measure of the absolute fit between two curves. The research was conducted for a scaled-down blade of a three-bladed horizontal-axis wind turbine with 36 m diameter rotor. The study was divided into two parts. The first stage included numerical calculations using the finite element method, which were supplemented in the second stage by measurements under laboratory conditions of the specially manufactured composite blade. The forms of natural vibrations for intact and damaged blade were determined using Laser Doppler Scanning Vibrometry. The results of the presented research confirm the effectiveness of the modal analysis combined with statistic calculation in damage detection. The method points out the location of relatively small damage.

scholarly journals Structural Performance of 14m HAWT blade through CFD

2020 ◽  
Vol 9 (3) ◽  
pp. 1846-1955
Keyword(s):  
Wind Turbine ◽  
Structural Integrity ◽  
Operating Conditions ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Horizontal Axis Wind Turbine ◽  
Element Analysis ◽  
Process Verification ◽  
Efficient Extraction ◽  
Blade Element

An alternative method used in generating energy is with the help of wind turbines utilizing power from the winds. The efficient extraction of energy hinges on the geometry and structure of the blade. The blade of wind turbine encounters high operational loads and undergoes fluctuating conditions of environment. The proposed work comprises of creating an exact model using CAD applications which includes the optimized geometry of the blade in addition with process verification of structural integrity, under several operating conditions by the means of finite element analysis. The prime motive of the proposed study is to check and evaluate the reliability of the blades by developing the entire geometry of the blade and performing failure analysis by altering load conditions. The construction of blade geometry is done by implementing the blade element momentum theory (BEMT) in order to retrieve the ultimate power coefficient at the required tip speed ratio of 7.05 by the means of optimization process. The NACA 63(4)-221 airfoil is used to create the primary design of blade. Blade with 14 m length has been taken for the present work for RRB V27-225 kW HAWT (horizontal axis wind turbine blade), which is an exclusive design of the blade. In order to perform analysis and modeling of the blade in presence and absence of shear web, two individual materials such as carbon fiber and glass fiber are taken in account. In the case of carbon fibre with shear web, the structural strength is improved which is shown in the results.

Investigation on Strength and Damage Test of Composite Blade for Vertical Axis Wind Turbine

2018 ◽  
Vol 774 ◽  
pp. 125-130
Author(s):  
Hyun Bum Park
Keyword(s):  
Wind Turbine ◽  
High Efficiency ◽  
Design Procedure ◽  
Vertical Axis ◽  
Test Results ◽  
Vertical Axis Wind Turbine ◽  
Element Analysis ◽  
Composite Blade ◽  
Comparison Results ◽  
Aerodynamic Configuration

This work is to design a high efficiency composite vertical axis wind turbine blade which is applicable to relatively low speed region. In the aerodynamic design, the parametric study is carried out to find an optimal aerodynamic configuration having high efficiency in both low and high wind speed region using the proposed design procedure. In the structural design, the blade adopts the skin-spar-foam core sandwich structure concept. The glass fabric/epoxy composite material is used for both skin and spar. The designed configuration is repeatedly modified by structural analysis results using a finite element analysis method. Finally, the strength and damage test of designed blade was conducted. In order to evaluate the test results, it was compared with estimated results. According to comparison results, the estimated results were well agreed with the experimental results.

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