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Author : E. R. Jørgensen
Publisher :
ISBN 13 : 9788755031838
Total Pages : 29 pages
Book Rating : 4.0/5 (318 download)
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:
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 : F. Mølholt Jensen
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128089121
Total Pages : 36 pages
Book Rating : 4.1/5 (28 download)
Download or read book Advances in wind turbine blade design and materials written by F. Mølholt Jensen and published by Elsevier Inc. Chapters. This book was released on 2013-10-31 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the current and future trends in wind turbine blade structural design process is presented. The main design principles and failure mechanisms of blades in operation are assessed and explained through an industry point of view, in a realistic manner. A number of failure modes which are not addressed sufficiently in the certificate guidelines are presented. An example on how to use the new design philosophy is presented. The manufactured prototype is a 44m long load carrying spar and the weight is reduced by 40%.
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 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 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two 8.3 m wind turbine blades intentionally constructed with manufacturing flaws were tested to failure at NREL's NWTC. Two blades were tested, one blade was manufactured with a fiberglass spar cap and the second spade was manufactured with a carbon fiber spar cap. Test loading primarily consisted of fatigue loading the blades, with one quasi-static ultimate load case applied to the carbon fiber 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).
Author : Povl Brondsted
Publisher : Elsevier
ISBN 13 : 0857097288
Total Pages : 485 pages
Book Rating : 4.8/5 (57 download)
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
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 :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (684 download)
Download or read book Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a simplified method for converting wind turbine rotor design loads into equivalent-damage, constant-amplitude loads and load ratios for both flap and lead-lag directions. It is an iterative method that was developed at the National Renewable Energy Laboratory (NREL) using Palmgren-Miner's linear damage principles. The general method is unique because it does not presume that any information about the materials or blade structural properties is precisely known. According to this method, the loads are never converted to stresses. Instead, a family of M-N curves (moment vs. cycles) is defined with reasonable boundaries for load-amplitude and slope. An optimization program iterates and converges on the constant amplitude test load and load ratio that minimizes the sensitivity to the range of M-N curves for each blade section. The authors constrained the general method to match the NedWind 25 design condition for the Standards, Measurements, and Testing (SMT) blade testing pro gram. SMT participants agreed to use the fixed S-N slope of m = 10 from the original design to produce consistent test-loads among the laboratories. Unconstrained, the general method suggests that slightly higher test loads should be used for the NedWind 25 blade design spectrum. NedWind 25 blade test loads were computed for lead-lag and flap under single-axis and two-axis loading.
Author : Find Moelholt Jensen
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838359403
Total Pages : 96 pages
Book Rating : 4.3/5 (594 download)
Download or read book Ultimate Strength of a Large Wind Turbine Blade written by Find Moelholt Jensen and published by LAP Lambert Academic Publishing. This book was released on 2010-06 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titel short: Ultimate Strength of a large WT-blade The present work contains a study of the structural static strength of wind turbine blades. A combination of experimental and numerical work has been used to address the most critical failure mechanims and to get an understanding of the complex structural behaviour of wind turbine blades. Four failure mechanisms observed during the full-scale tests and the corresponding FE-analysis are presented. Elastic mechanisms associated with failure, such as buckling, localized bending and the Brazier effect, are studied. In the thesis six different types of structural reinforcements helping to prevent undesired structural elestic mechanims are presented. Five full-scale tests have been performed. Comparisons of the ultimate loads observed in the full-sacle test are presented and conclusions are drawn based on the mechanisms found. The thesis consists of a comprehensive summery and a collection of three papers and four patent applications.
Author : Gregg Freebury
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (438 download)
Download or read book Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests written by Gregg Freebury and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 : 9782832215067
Total Pages : 43 pages
Book Rating : 4.2/5 (15 download)
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:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
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 0 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.
Author : R. Mayes
Publisher : Springer Science & Business Media
ISBN 13 : 1461424216
Total Pages : 354 pages
Book Rating : 4.4/5 (614 download)
Download or read book Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2 written by R. Mayes and published by Springer Science & Business Media. This book was released on 2012-04-11 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2, Proceedings of the 30th IMAC, A Conference and Exposition on Structural Dynamics, 2012, the second volume of six from the Conference, brings together 31 contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Structural Dynamics.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781725186231
Total Pages : 32 pages
Book Rating : 4.1/5 (862 download)
Download or read book Structural Qualification Testing and Operational Loading on a Fiberglass Rotor Blade for the Mod-OA Wind Turbine written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-13 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue tests were performed on full- and half-scale root end sections, first to qualify the root retention design, and second to induce failure. Test methodology and results are presented. Two operational blades were proof tested to design limit load to ascertain buckling resistance. Measurements of natural frequency, damping ratio, and deflection under load made on the operational blades are documented. The tests showed that all structural design requirements were met or exceeded. Blade loads measured during 3000 hr of field operation were close to those expected. The measured loads validated the loads used in the fatigue tests and gave high confidence in the ability of the blades to achieve design life. Sullivan, T. L. Glenn Research Center NASA-TM-83309, NASA/DOE/20320-44, E-1548, NAS 1.15:83309 DE-AI01-76ET-20320; RTOP 776-33-41...
Author : Wei Tong
Publisher : WIT Press
ISBN 13 : 1845642058
Total Pages : 769 pages
Book Rating : 4.8/5 (456 download)
Download or read book Wind Power Generation and Wind Turbine Design written by Wei Tong and published by WIT Press. This book was released on 2010-04-30 with total page 769 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to provide engineers and researchers in both the wind power industry and energy research community with comprehensive, up-to-date, and advanced design techniques and practical approaches. The topics addressed in this book involve the major concerns in the wind power generation and wind turbine design.
Author : Peter Robert Greaves
Publisher :
ISBN 13 :
Total Pages : 289 pages
Book Rating : 4.:/5 (913 download)
Download or read book Fatigue Analysis and Testing of Wind Turbine Blades written by Peter Robert Greaves and published by . This book was released on 2013 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract:This thesis focuses on fatigue analysis and testing of large, multi MW wind turbine blades. The blades are one of the most expensive components of a wind turbine, and their mass has cost implications for the hub, nacelle, tower and foundations of the turbine so it is important that they are not unnecessarily strong. Fatigue is often an important design driver, but fatigue of composites is poorly understood and so large safety factors are often applied to the loads. This has implications for the weight of the blade. Full scale fatigue testing of blades is required by the design standards, and provides manufacturers with confidence that the blade will be able to survive its service life. This testing is usually performed by resonating the blade in the flapwise and edgewise directions separately, but in service these two loads occur at the same time. A fatigue testing method developed at Narec (the National Renewable Energy Centre) in the UK in which the flapwise and edgewise directions are excited simultaneously has been evaluated by comparing the Palmgren-Miner damage sum around the blade cross section after testing with the damage distribution caused by the service life. A method to obtain the resonant test configuration that will result in the optimum mode shapes for the flapwise and edgewise directions was then developed, and simulation software was designed to allow the blade test to be simulated so that realistic comparisons between the damage distributions after different test types could be obtained. During the course of this work the shortcomings with conventional fatigue analysis methods became apparent, and a novel method of fatigue analysis based on multi-continuum theory and the kinetic theory of fracture was developed. This method was benchmarked using physical test data from the OPTIDAT database and was applied to the analysis of a complete blade. A full scale fatigue test method based on this new analysis approach is also discussed.
Author : Arash Hassanzadeh Hassanabad
Publisher :
ISBN 13 : 9781392539910
Total Pages : 98 pages
Book Rating : 4.5/5 (399 download)
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.
Author : Dario Di Maio
Publisher : Springer
ISBN 13 : 3319546481
Total Pages : 154 pages
Book Rating : 4.3/5 (195 download)
Download or read book Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8 written by Dario Di Maio and published by Springer. This book was released on 2017-03-27 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotating Machinery, Hybrid Testing, Vibro-Acoustics & Laser Vibrometry, Volume 8: Proceedings of the 35th IMAC, A Conference and Exposition on Structural Dynamics, 2017, the eighth volume of ten from the Conference brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on fundamental and applied aspects of Rotating Machinery, Hybrid Testing, Vibro-Acoustics & Laser Vibrometry, including papers on: Rotating Machinery Vibro-Acoustics Experimental Techniques Advances in Wind Energy Scanning Laser Doppler Vibrometry Methods Hybrid Test Methods
