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The Development Of A Phase Locked Excitation Testing Method For Full Scale Wind Turbine Blades
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Book Synopsis The Development of a Phase Locked Excitation Testing Method for Full-scale Wind Turbine Blades by : Waleed F. Gowharji
Download or read book The Development of a Phase Locked Excitation Testing Method for Full-scale Wind Turbine Blades written by Waleed F. Gowharji and published by . This book was released on 2011 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Historically, fatigue testing has been performed by utilizing force displacement systems. These systems do not allow for the load phase angle to be controlled, which leads to inaccurate loading distributions, when compared to actual field gathered data. The PhLEX (Phase Locked Excitation System) testing method outlined herein utilizes resonant excitation system in order to reduce energy requirements, decrease test duration and improve overall loading distributed."--Leaf iii.
Book Synopsis The Development of a Phase Locked Wind Turbine Blade Finite Element Model to Predict Loads and Deflections During Fatigue Testing by : Kyle Andrew Freeman
Download or read book The Development of a Phase Locked Wind Turbine Blade Finite Element Model to Predict Loads and Deflections During Fatigue Testing written by Kyle Andrew Freeman and published by . This book was released on 2010 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The PhLEX (phase locked excitation system) under development utilizes a resonant excitation system in order to reduce hydraulic requirements, decrease test duration and improve distributed load matching. Control of the phase angle will allow for more accurate testing of the blade. This thesis paper will detail the method and theory used to develop a model of a phase locked resonant test system for structural testing of wind turbine blades."--Page iii.
Book Synopsis The Development of an Adaptive Control System for a Phase-locked Excitation (PhLEX) Method for Advanced Wind Turbine Blade Fatigue Testing by : William Michael Haupfear
Download or read book The Development of an Adaptive Control System for a Phase-locked Excitation (PhLEX) Method for Advanced Wind Turbine Blade Fatigue Testing written by William Michael Haupfear and published by . This book was released on 2010 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The purpose of this research is to develop an adaptive control system for advancing the current dual-axis fatigue testing methods of wind turbine blades ... This section will focus on those topics from a high level perspective through a literature review of sources relating to wind energy and blade testing."--Page 1.
Book Synopsis Proof of Concept Test for Dual-axis Resonant Phase-Locked Excitation (PhLEX) Fatigue Testing Method for Wind Turbine Blades by : Jenna Austin Beckwith
Download or read book Proof of Concept Test for Dual-axis Resonant Phase-Locked Excitation (PhLEX) Fatigue Testing Method for Wind Turbine Blades written by Jenna Austin Beckwith and published by . This book was released on 2014 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The PhLEX proof-of-concept test set-up and the results and conclusions of the proof-of-concept test are presented in this thesis.
Book Synopsis New Method for Dual-Axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading - Scholar's Choice Edition by : National Renewable Energy Laboratory (Nr
Download or read book New Method for Dual-Axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading - Scholar's Choice Edition written by National Renewable Energy Laboratory (Nr and published by Scholar's Choice. This book was released on 2015-02-16 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Book Synopsis Biaxial Dynamic Fatigue Tests of Wind Turbine Blades by : Falko Bürkner
Download or read book Biaxial Dynamic Fatigue Tests of Wind Turbine Blades written by Falko Bürkner and published by Fraunhofer Verlag. This book was released on 2021-04-09 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: Testing rotor blades of wind turbines is essential to mitigate financial risks caused by serial damages. Present day uniaxial dynamic tests are time consuming and often inaccurate regarding the applied loading. This thesis proposes a faster fatigue test method by loading the two primary directions at the same time. In addition, a more realistic test, compared to uniaxial tests, is accomplished by loading larger areas of the blade cross-sections. To achieve this, an elliptical biaxial dynamic excitation is used. To fulfill the industry requirement for cost effective tests, a relatively simple test setup was developed, still achieving an elliptical dynamic excitation of the rotor blade. Two methods for an accurate determination of the applied loadings for dynamic fatigue tests are described. These calibration tests use easily measured values and simple analysis to achieve accurate test load measurements in a cost-effective way.
Book Synopsis Design, Instrumentation Development, and Testing of a Wind Turbine Blade for Sub-scale Wake Studies by : Arash Hassanzadeh Hassanabad
Download or read book Design, Instrumentation Development, and Testing of a Wind Turbine Blade for Sub-scale Wake Studies written by Arash Hassanzadeh Hassanabad and published by . This book was released on 2019 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sub-scale testing of wind turbines in wind tunnels is necessary for better understanding the blade aerodynamics and wakes as well as for producing data necessary to validate computational approaches for simulating these flows. For these experiments to have the most relevance, the wakes generated by the sub-scale turbines must contain the important characteristics found in modern utility-scale turbines. In this work, a new design approach was proposed for developing wind turbine blades for sub-scale wake testing. The approach is expected to allow wakes of small scale (2 m diameter) wind turbine rotor to contain many of the important physics of wakes generated by an industrial scale wind turbine rotor despite the difference in size. The design approach matched the blade load distributions for utility-scale and sub-scale turbines, and the results showed that the design goals are achieved. To independently assess the approach, the designed and industrial scale blades were modeled using numerical simulations. The simulation results indicated that many of the important features in the wake of the full-scale blade are present in that of the sub-scale blade. The blade was manufactured and instrumented for blade surface pressure measurements, and the instrumentation development was performed to allow for inflow, blade load distribution and wake measurements in a large-scale wind tunnel. Unsteady inflow, unsteady blade load distribution, and instantaneous wake measurements were acquired to characterize wake development and near-wake behavior. The results demonstrated that the instrumentation was successful and effective in characterizing the blade loading and flow field. In addition, the results showed that the measurement of both blade loading and wake properties facilitate understanding of the wake’s behavior, and the blade load distribution can be used to explain the near-wake structure. Tests covering a wider range of conditions would be valuable for validating simulations of wind turbine flows.
Book Synopsis A New Method for Dual-axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading by : Darris L. White
Download or read book A New Method for Dual-axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading written by Darris L. White and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Method for Dual-axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading by : Darris L. White
Download or read book New Method for Dual-axis Fatigue Testing of Large Wind Turbine Blades Using Resonance Excitation and Spectral Loading written by Darris L. White and published by . This book was released on 2003 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NREL Wind Turbine Blade Structural Testing of the Modular Wind Energy MW45 Blade: Cooperative Research and Development Final Report, CRADA Number CRD-09-354 by :
Download or read book NREL Wind Turbine Blade Structural Testing of the Modular Wind Energy MW45 Blade: Cooperative Research and Development Final Report, CRADA Number CRD-09-354 written by and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This CRADA was a purely funds-in CRADA with Modular Wind Energy (MWE). MWE had a need to perform full-scale testing of a 45-m wind turbine blade. NREL/NWTC provided the capabilities, facilities, and equipment to test this large-scale MWE wind turbine blade. Full-scale testing is required to demonstrate the ability of the wind turbine blade to withstand static design load cases and demonstrate thefatigue durability. Structural testing is also necessary to meet international blade testing certification requirements. Through this CRADA, MWE would obtain test results necessary for product development and certification, and NREL would benefit by working with an industrial partner to better understand the unique test requirements for wind turbine blades with advanced structural designs.
Book Synopsis Full Scale Testing of Wind Turbine Blade to Failure - Flapwise Loading by : E. R. Jørgensen
Download or read book Full Scale Testing of Wind Turbine Blade to Failure - Flapwise Loading written by E. R. Jørgensen and published by . This book was released on 2004 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improving Bending Moment Measurements on Wind Turbine Blades by :
Download or read book Improving Bending Moment Measurements on Wind Turbine Blades written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Full-scale fatigue testing of wind turbine blades is conducted using resonance test techniques where the blade plus additional masses is excited at its first resonance frequency to achieve the target loading amplitude. Because there is not a direct relationship between the force applied by an actuator and the bending moment, the blade is instrumented with strain gauges that are calibrated under static loading conditions to determine the sensitivity or relationship between strain and applied moment. Then, during dynamic loading the applied moment is calculated using the strain response of the structure. A similar procedure is also used in the field to measure in-service loads on turbine blades. Because wind turbine blades are complex twisted structures and the deflections are large, there is often significant cross-talk coupling in the sensitivity of strain gauges placed on the structure. Recent work has shown that a sensitivity matrix with nonzero cross terms must be employed to find constant results when a blade is subjected to both flap and lead-lag loading. However, even under controlled laboratory conditions, potential for errors of 3 percent or more in the measured moment exist when using the typical cross-talk matrix approach due to neglecting the influence of large deformations and torsion. This is particularly critical when considering a biaxial load as would be applied on the turbine or during a biaxial fatigue test. This presentation describes these results demonstrating errors made when performing current loads measurement practices on wind turbine blades in the lab and evaluating potential improvements using enhanced cross-talk matrix approaches and calibration procedures.
Download or read book Wind Turbines written by and published by . This book was released on 2014 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Energy Update written by and published by . This book was released on 1985 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Wind Turbine Blade Design and Materials by : Povl Brondsted
Download or read book Advances in Wind Turbine Blade Design and Materials written by Povl Brondsted and published by Elsevier. This book was released on 2013-10-31 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind energy is gaining critical ground in the area of renewable energy, with wind energy being predicted to provide up to 8% of the world’s consumption of electricity by 2021. Advances in wind turbine blade design and materials reviews the design and functionality of wind turbine rotor blades as well as the requirements and challenges for composite materials used in both current and future designs of wind turbine blades. Part one outlines the challenges and developments in wind turbine blade design, including aerodynamic and aeroelastic design features, fatigue loads on wind turbine blades, and characteristics of wind turbine blade airfoils. Part two discusses the fatigue behavior of composite wind turbine blades, including the micromechanical modelling and fatigue life prediction of wind turbine blade composite materials, and the effects of resin and reinforcement variations on the fatigue resistance of wind turbine blades. The final part of the book describes advances in wind turbine blade materials, development and testing, including biobased composites, surface protection and coatings, structural performance testing and the design, manufacture and testing of small wind turbine blades. Advances in wind turbine blade design and materials offers a comprehensive review of the recent advances and challenges encountered in wind turbine blade materials and design, and will provide an invaluable reference for researchers and innovators in the field of wind energy production, including materials scientists and engineers, wind turbine blade manufacturers and maintenance technicians, scientists, researchers and academics. Reviews the design and functionality of wind turbine rotor blades Examines the requirements and challenges for composite materials used in both current and future designs of wind turbine blades Provides an invaluable reference for researchers and innovators in the field of wind energy production
Book Synopsis Evaluation of the New B-REX Fatigue Testing System for Multi-megawatt Wind Turbine Blades by : Darris White
Download or read book Evaluation of the New B-REX Fatigue Testing System for Multi-megawatt Wind Turbine Blades written by Darris White and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Renewable Energy Laboratory (NREL) recently developed a new hybrid fatigue testing system called the Blade Resonance Excitation (B-REX) test system. The new system uses 65% less energy to test large wind turbine blades in half the time of NREL's dual-axis forced-displacement test method with lower equipment and operating costs. The B-REX is a dual-axis test system that combines resonance excitation with forced hydraulic loading to reduce the total test time required while representing the operating strains on the critical inboard blade stations more accurately than a single-axis test system. The analysis and testing required to fully implement the B-REX was significant. To control unanticipated blade motion and vibrations caused by dynamic coupling between the flap, lead-lag, and torsional directions, we needed to incorporate additional test hardware and control software. We evaluated the B-REX test system under stable operating conditions using a combination of various sensors. We then compared our results with results from the same blade, tested previously using NREL's dual-axis forced-displacement test method. Experimental results indicate that strain levels produced by the B-REX system accurately replicated the forced-displacement method. This paper describes the challenges we encountered while developing the new blade fatigue test system and the experimental results that validate its accuracy.
