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Author : David Schumacher
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Wind Turbine Rotor Blade Testing by Dual-energy Laminography written by David Schumacher and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Povl Brondsted
Publisher : Woodhead Publishing
ISBN 13 : 0081030088
Total Pages : 516 pages
Book Rating : 4.0/5 (81 download)
Download or read book Advances in Wind Turbine Blade Design and Materials written by Povl Brondsted and published by Woodhead Publishing. This book was released on 2023-01-14 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Wind Turbine Blade Design and Materials, Second Edition, builds on the thorough review of the design and functionality of wind turbine rotor blades and the requirements and challenges for composite materials used in both current and future designs of wind turbine blades. 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
Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (16 download)
Download or read book Wind Turbine Blade Test Definition of the DeWind DW90 Rotor Blade written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: This CRADA was developed as a funds-in CRADA with DeWind to assess the suitability of facilities and equipment at the NWTC for performing certification blade testing on wind turbine blades made from advanced materials. DeWind produces a wind turbine blade which includes the use of high-strength and stiffness materials. NREL and DeWind had a mutual interest in defining the necessary facilities, equipment, and test methods for testing large wind turbine blades which incorporate advanced materials and adaptive structures, as the demands on test equipment and infrastructure are greater than current capabilities. Work under this CRADA would enable DeWind to verify domestic capability for certification-class static and fatigue testing, while NREL would be able to identify and develop specialized test capabilities based on the test requirements.
Author : National Renewable Energy Laboratory (Nr
Publisher : Scholar's Choice
ISBN 13 : 9781297044090
Total Pages : 198 pages
Book Rating : 4.0/5 (44 download)
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.
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Dual-Axis Resonance Testing of Wind Turbine Blades written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus (100) for fatigue testing test articles (104) including wind turbine blades. The apparatus (100) includes a test stand (110) that rigidly supports an end (106) of the test article (104). An actuator assembly (120) is attached to the test article (104) and is adapted for substantially concurrently imparting first and second forcing functions in first and second directions on the testarticle (104), with the first and second directions being perpendicular to a longitudinal axis. A controller (130) transmits first and second sets of displacement signals (160, 164) to the actuator assembly (120) at two resonant frequencies of the test system (104). The displacement signals (160, 164) initiate the actuator assembly (120) to impart the forcing loads to concurrently oscillate thetest article (104) in the first and second directions. With turbine blades, the blades (104) are resonant tested concurrently for fatigue in the flapwise and edgewise directions.
Author : B. Kjærside Storm
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128089237
Total Pages : 32 pages
Book Rating : 4.1/5 (28 download)
Download or read book Advances in wind turbine blade design and materials written by B. Kjærside Storm and published by Elsevier Inc. Chapters. This book was released on 2013-10-31 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter discusses surface layer protection for wind turbine rotor blades. The surface protection and coating can be a gelcoat or a paint and can be made of unsaturated polyester, epoxy, polyurethane or acrylic. As wind turbines are often erected in harsh climates, the blade surface will be exposed to conditions that cause erosion and wear. There are tests to measure resistance against these attacks, and the surface is designed to minimize damage to the blade caused by the environment. By using existing standards for surface layers for offshore use and for helicopters, it has been found that a combination of accelerated tests for UV degradation, chemical attack and wear give a complete picture of the performance of surface layers.
Author : S. K. Dhiman
Publisher : GRIN Verlag
ISBN 13 : 3668798591
Total Pages : 82 pages
Book Rating : 4.6/5 (687 download)
Download or read book Effect of some design parameters: A performance test on VAWT written by S. K. Dhiman and published by GRIN Verlag. This book was released on 2018-09-17 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific Study from the year 2018 in the subject Engineering - Mechanical Engineering, grade: 2, , language: English, abstract: Two different blade profiles were investigated for the performance of VAWT rotor. One is two scopped with different overlap ratios and the aspect ratios test under three different sir velocities and the other is the forward curved profiled blades with different inclinations with respect to shaft normal at the aspect ratios of 1 and 2. The present investigation helps in concluding that a two-scoop blades arrangement with H/D = 0,775 and e/d = 0,24 contributes the most favorable value of rotational speed of the rotor at which power coefficient and the torque coefficient can be maximized. While for the forward curved profiled blades the investigation realizes that higher power out of three blade system with curtaining from the combined effect of all the parameter i.e. N, Ω, ξP and ξT provides the higher strength of the power output. Hence, the three-blade system with curtaining is considered as the best out of all the blades tested.
Author : Falko Bürkner
Publisher : Fraunhofer Verlag
ISBN 13 : 9783839617106
Total Pages : 195 pages
Book Rating : 4.6/5 (171 download)
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.
Author : Darris L. White
Publisher :
ISBN 13 :
Total Pages : 185 pages
Book Rating : 4.:/5 (551 download)
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:
Download or read book Dual-axis Resonance Testing of Wind Turbine Blades written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus (100) for fatigue testing test articles (104) including wind turbine blades. The apparatus (100) includes a test stand (110) that rigidly supports an end (106) of the test article (104). An actuator assembly (120) is attached to the test article (104) and is adapted for substantially concurrently imparting first and second forcing functions in first and second directions on the test article (104), with the first and second directions being perpendicular to a longitudinal axis. A controller (130) transmits first and second sets of displacement signals (160, 164) to the actuator assembly (120) at two resonant frequencies of the test system (104). The displacement signals (160, 164) initiate the actuator assembly (120) to impart the forcing loads to concurrently oscillate the test article (104) in the first and second directions. With turbine blades, the blades (104) are resonant tested concurrently for fatigue in the flapwise and edgewise directions.
Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book Structural Qualification Testing and Operational Loading on a Fiberglass Rotor Blade for the Mod-OA Wind Turbine written by and published by . This book was released on 1983 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.J. Heijdra
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128089253
Total Pages : 21 pages
Book Rating : 4.1/5 (28 download)
Download or read book Advances in wind turbine blade design and materials written by J.J. Heijdra and published by Elsevier Inc. Chapters. This book was released on 2013-10-31 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: International safety and design standards for structural performance analysis require full-scale testing of each wind turbine blade prototype and of blades that have undergone major design changes. The purpose of blade testing is to demonstrate that the blade design and production are such that the blade possesses the intended strength and service life. Full-scale testing can be seen as final design verification that also checks the assumptions used in the design. In this chapter, aspects of full-scale blade testing are considered in the practical context of the blade test laboratory. An overview is given of the tests which make up the complete test program, the loads used for each and the equipment and instrumentation used.
Author : D. G. Griffee
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (335 download)
Download or read book Design, Fabrication, and Test of a Composite Material Wind Turbine Rotor Blade written by D. G. Griffee and published by . This book was released on 1977 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bill Gage (Research technician)
Publisher :
ISBN 13 :
Total Pages : 85 pages
Book Rating : 4.:/5 (131 download)
Download or read book Laboratory Wind Turbine Blade Static Testing of the Sandia National Rotor Testbed 13-meter Wind Turbine Blade written by Bill Gage (Research technician) and published by . This book was released on 2021 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P.D. Clausen
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128089245
Total Pages : 28 pages
Book Rating : 4.1/5 (28 download)
Download or read book Advances in wind turbine blade design and materials written by P.D. Clausen and published by Elsevier Inc. Chapters. This book was released on 2013-10-31 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small wind turbine blades share a number of features with large blades, but have some important differences. The two main differences are their much higher rotational speed, which causes more fatigue cycles and higher yaw moments, and their operation at low Reynolds number, which means that thick aerofoil sections cannot be used near the root. This chapter discusses the design challenges arising from these differences, the materials commonly used for blade manufacture, and the fatigue testing of small blades. The use of timber is highlighted for very small blades, and fibre-reinforced composite manufacture of larger ones is discussed in terms of sustainability, conformity of manufactured shape, and fatigue behaviour.
Author : Darris White
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (682 download)
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 14 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (925 download)
Download or read book Structural Testing of the Blade Reliability Collaborative Effect of Defect Wind Turbine Blades written by and published by . This book was released on 2015 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two 8.3-meter (m) wind turbine blades intentionally constructed with manufacturing flaws were tested to failure at the National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory (NREL) south of Boulder, Colorado. Two blades were tested; one blade was manufactured with a fiberglass spar cap and the second blade was manufactured with a carbon fiber spar cap. Test loading primarily consisted of flap fatigue loading of the blades, with one quasi-static ultimate load case applied to the carbon fiber spar cap blade. Results of the test program were intended to provide the full-scale test data needed for validation of model and coupon test results of the effect of defects in wind turbine blade composite materials. Testing was part of the Blade Reliability Collaborative (BRC) led by Sandia National Laboratories (SNL). The BRC seeks to develop a deeper understanding of the causes of unexpected blade failures (Paquette 2012), and to develop methods to enable blades to survive to their expected operational lifetime. Recent work in the BRC includes examining and characterizing flaws and defects known to exist in wind turbine blades from manufacturing processes (Riddle et al. 2011). Recent results from reliability databases show that wind turbine rotor blades continue to be a leading contributor to turbine downtime (Paquette 2012).
