Determining Equivalent Damage Loading For Full Scale Wind Turbine Blade Fatigue Tests

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Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests by :

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.

Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests

Author : Gregg Freebury
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (438 download)

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Book Synopsis Determining Equivalent Damage Loading for Full-scale Wind Turbine Blade Fatigue Tests by : Gregg Freebury

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:

Advances in Wind Turbine Blade Design and Materials

Author : Povl Brondsted
Publisher : Elsevier
ISBN 13 : 0857097288
Total Pages : 485 pages
Book Rating : 4.8/5 (57 download)

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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

Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades

Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades by :

Download or read book Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this paper is to compare two methods of blade test loading and show how they are applied in an actual blade test. Strength and load-based methods were examined to determine the test load for an Atlantic Orient Corporation (AOC) 15/50 wind turbine blade for fatigue and static testing. Fatigue load-based analysis was performed using measured field test loads extrapolated for extreme rare events and scaled to thirty-year spectra. An accelerated constant amplitude fatigue test that gives equivalent damage at critical locations was developed using Miner's Rule and the material S-N curves. Test load factors were applied to adjust the test loads for uncertainties, and differences between the test and operating environment. Similar analyses were carried, out for the strength-based fatigue test using the strength of the blade and the material properties to determine the load level and number of constant amplitude cycles to failure. Static tests were also developed using load and strength criteria. The resulting test loads were compared and contrasted. The analysis shows that, for the AOC 15/50 blade, the strength-based test loads are higher than any of the static load-based cases considered but were exceeded in the fatigue analysis for a severe hot/wet environment.

Advances in wind turbine blade design and materials

Author : J.J. Heijdra
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128089253
Total Pages : 21 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Advances in wind turbine blade design and materials by : J.J. Heijdra

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.

Comparison of Strength and Load-Based Methods for Wind Turbine Blades

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Comparison of Strength and Load-Based Methods for Wind Turbine Blades by :

Download or read book Comparison of Strength and Load-Based Methods for Wind Turbine Blades written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this paper is to compare two methods of blade test loading and show how they are applied in an actual blade test. Strength and load-based methods were examined to determine the test load for an Atlantic Orient Corporation (AOC)15/50 wind turbine blade for fatigue and static testing. Fatigue load-based analysis was performed using measured field test loads extrapolated for extremerare events and scaled to thirty-year spectra. An accelerated constant amplitude fatigue test that gives equivalent damage at critical locations was developed using Miner's Rule and the material S-N curves. Test load factors were applied to adjust the test loads for uncertainties, and differences between the test and operating environment. Similar analyses were carried out for the strength-basedfatigue test using the strength of the blade and the material properties to determine the load level and number of constant amplitude cycles to failure. Static tests were also developed using load and strength criteria. The resulting test loads were compared and contrasted. The analysis shows that, for the AOC 15/50 blade, the strength-based test loads are higher than any of the staticload-based cases considered but were exceeded in the fatigue analysis for a severe hot/wet environment.

Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades

Author : Walter D. Musial
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (362 download)

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Book Synopsis Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades by : Walter D. Musial

Download or read book Comparison of Strength and Load-based Methods for Testing Wind Turbine Blades written by Walter D. Musial and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this paper is to compare two methods of blade test loading and show how they are applied in an actual blade test. Strength and load-based methods were examined to determine the test load for an Atlantic Orient Corporation (AOC)15/50 wind turbine blade for fatigue and static testing. Fatigue load-based analysis was performed using measured field test loads extrapolated for extreme rare events and scaled to thirty-year spectra. An accelerated constant amplitude fatigue test that gives equivalent damage at critical locations was developed using Miner's Rule and the material S-N curves. Test load factors were applied to adjust the test loads for uncertainties, and differences between the test and operating environment. Similar analyses were carried out for the strength-based fatigue test using the strength of the blade and the material properties to determine the load level and number of constant amplitude cycles to failure. Static tests were also developed using load and strength criteria. The resulting test loads were compared and contrasted. The analysis shows that, for the AOC 15/50 blade, the strength-based test loads are higher than any of the static load-based cases considered but were exceeded in the fatigue analysis for a severe hot/wet environment.

Fatigue Data Editing for Blades of Horizontal Axis Wind Turbines

Author : Pratumnopharat Panu
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659803284
Total Pages : 208 pages
Book Rating : 4.8/5 (32 download)

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Book Synopsis Fatigue Data Editing for Blades of Horizontal Axis Wind Turbines by : Pratumnopharat Panu

Download or read book Fatigue Data Editing for Blades of Horizontal Axis Wind Turbines written by Pratumnopharat Panu and published by LAP Lambert Academic Publishing. This book was released on 2015-11-12 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: In predicting performance of wind turbines, the blade element momentum (BEM) theory is still commonly used by wind turbine designers and researchers. This book deals with several up-to-date models added to the BEM theory to get more realistic prediction. In evaluating fatigue damage of wind turbine blade, stress-life approach and Miner's linear cumulative damage rule are mentioned. Wind turbine blades are the most critical components of HAWT. Full-scale blade fatigue testing is required to verify that the blades possess the strength and service life specified in the design. Unfortunately, the test must be run for a long time period. This problem led the blade testing laboratories to accelerate fatigue testing time. To achieve the objective, two novel methods called STFT- and WT-based fatigue damage part extracting methods are used to generate the edited stress-time history. Blade testing laboratories can use this history to accelerate fatigue testing time. STFT- and WT-based fatigue damage part extracting methods proposed in this book are suggested as alternative methods in accelerating fatigue testing time, especially for the field of wind turbine engineering.

The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (559 download)

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Book Synopsis The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage by :

Download or read book The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wind Turbines

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Publisher :
ISBN 13 : 9782832215067
Total Pages : 43 pages
Book Rating : 4.2/5 (15 download)

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Book Synopsis Wind Turbines by :

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:

Implementation of a Two-Axis Servo-Hydraulic System for Full-Scale Fatigue Testing of Wind Turbine Blades

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (683 download)

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Book Synopsis Implementation of a Two-Axis Servo-Hydraulic System for Full-Scale Fatigue Testing of Wind Turbine Blades by :

Download or read book Implementation of a Two-Axis Servo-Hydraulic System for Full-Scale Fatigue Testing of Wind Turbine Blades written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the blade fatigue testing capabilities at NREL were upgraded from single-axis to two-axis loading. To implement this, several practical challenges were addressed, as hardware complexity increased dramatically with two actuators applying the loads at right angles to each other. A custom bellcrank was designed and implemented to minimize the load angle errors and to prevent actuator side loading. The control system was upgraded to accept load and displacement feedback from two actuators. The inherent long strokes uniquely associated with wind turbine blade-tests required substantial real-time corrections for both the control and data systems. A custom data acquisition and control system was developed using a National Instruments LabVIEW platform that interfaces with proprietary servo-hydraulic software developed by MTS Corporation. Before testing, the program is run under quasi-static (slow speed) conditions and iterates to determine the correct operational control parameters for the controller, taking into consideration geometry, test speed, and phase angle errors between the two actuators. Comparisons are made between single-axis and two-axis test loads using actual test load data and load uncertainties are qualitatively described. To date, two fatigue tests have been completed and another is currently ongoing using NREL's two-axis capability.

Structural Reliability

Author : Maurice Lemaire
Publisher : John Wiley & Sons
ISBN 13 : 111862310X
Total Pages : 356 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis Structural Reliability by : Maurice Lemaire

Download or read book Structural Reliability written by Maurice Lemaire and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the main methods used in the reliability of structures and their use in the design process leading to reliable products. This title provides the understanding needed to implement the variety of new reliability software programs.

Model Validation and Uncertainty Quantification, Volume 3

Author : H. Sezer Atamturktur
Publisher : Springer Science & Business Media
ISBN 13 : 3319045520
Total Pages : 419 pages
Book Rating : 4.3/5 (19 download)

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Book Synopsis Model Validation and Uncertainty Quantification, Volume 3 by : H. Sezer Atamturktur

Download or read book Model Validation and Uncertainty Quantification, Volume 3 written by H. Sezer Atamturktur and published by Springer Science & Business Media. This book was released on 2014-04-11 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third volume of eight from the IMAC - XXXII 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 Structural Dynamics, including papers on: Linear Systems Substructure Modelling Adaptive Structures Experimental Techniques Analytical Methods Damage Detection Damping of Materials & Members Modal Parameter Identification Modal Testing Methods System Identification Active Control Modal Parameter Estimation Processing Modal Data

Structural Testing of the Blade Reliability Collaborative Effect of Defect Wind Turbine Blades

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Structural Testing of the Blade Reliability Collaborative Effect of Defect Wind Turbine Blades by :

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).

Wind Energy Explained

Author : James F. Manwell
Publisher : John Wiley & Sons
ISBN 13 : 111936745X
Total Pages : 853 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Wind Energy Explained by : James F. Manwell

Download or read book Wind Energy Explained written by James F. Manwell and published by John Wiley & Sons. This book was released on 2024-06-10 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authoritative and bestselling textbook detailing the many aspects of using wind as an energy source Wind Energy Explained provides complete and comprehensive coverage on the topic of wind energy, starting with general concepts like the history of and rationale for wind energy and continuing into specific technological components and applications along with the new recent developments in the field. Divided into 16 chapters, this edition includes up-to-date data, diagrams, and illustrations, boasting an impressive 35% new material including new sections on metocean design conditions, wind turbine design, wind power plants and the electrical system, fixed and floating offshore wind turbines, project development, permitting and environmental risks and benefits, turbine installation, operation and maintenance, and high penetration wind energy systems and power-to-X. Wind Energy Explained also includes information on: Modern wind turbines, covering the design and their many components such as the rotor, drive train, and generator Aerodynamics of wind energy, covering one-dimensional momentum theory, the Betz limit, and ideal horizontal axis wind turbine with wake rotation Environmental external design conditions, such as wind, waves, currents, tides, salinity, floating ice, and many more Commonly used materials and components, such as steel, composites, copper, and concrete, plus machinery elements, such as shafts, couplings, bearings, and gears Modern design methods, including probabilistic design Environmental effects and mitigation strategies for wind project siting and the role of public engagement in the development process This book offers a complete examination of one of the most promising sources of renewable energy and is a great introduction to this cross-disciplinary field for practicing engineers. It may also be used as a textbook resource for university level courses in wind energy, both introductory and advanced.

The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage

Author : D. L. White
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (559 download)

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Book Synopsis The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage by : D. L. White

Download or read book The Effect of Load Phase Angle on Wind Turbine Blade Fatigue Damage written by D. L. White and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue Analysis and Testing of Wind Turbine Blades

Author : Peter Robert Greaves
Publisher :
ISBN 13 :
Total Pages : 289 pages
Book Rating : 4.:/5 (913 download)

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Book Synopsis Fatigue Analysis and Testing of Wind Turbine Blades by : Peter Robert Greaves

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.