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Method For The Fatigue Life Prediction Of A Compliant Wind Turbine Support Tower
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Book Synopsis Method for the Fatigue Life Prediction of a Compliant Wind Turbine Support Tower by : Peter R. FitzPatrick
Download or read book Method for the Fatigue Life Prediction of a Compliant Wind Turbine Support Tower written by Peter R. FitzPatrick and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to review the procedure used by Hamilton Standard Division (HSD) for assessing the power spectral density (PSD) of the loading of a wind turbine compliant support tower due to wind turbulence. An additional objective was to perform a preliminary fatigue analysis demonstrating a method, developed at UTRC, for estimating the fatigue life.
Book Synopsis Analytical Fatigue Damage Calculation for Wind Turbine Support Structure by : Jiale Li
Download or read book Analytical Fatigue Damage Calculation for Wind Turbine Support Structure written by Jiale Li and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue plays an important, often crucial role in the design of wind turbine support structures due to the large number of wind-induced and operational stress cycles. Flexibility of the tower foundation is usually specified during the turbine design certification to achieve a natural frequency to reduce dynamic resonance with the turbine operational frequencies which could significantly increase the fatigue damage and possibly reduce operational design life. This research presents a practical analytical procedure of quantifying fatigue damage, investigates the impact of different foundation flexibility on fatigue life, and compares the results with measured response of the Case Western Reserve University campus turbine. A turbulent wind history is simulated, resulting tower and blade loads calculated, and applied to a finite element model of the wind turbine. The wind loads were applied to the analytical model to calculate the dynamic response of a parked turbine. A fatigue damage metric based on the tower base overturning moment response was defined and calculated for the ten minute simulation and compared with actual measured response under similar conditions (i.e. average wind speed, parked turbine). Fatigue damage is quantified using a rainflow cycle counting method. By comparing the numerical simulation with the real recorded data, the analytical method proved to be reliable. For the cases considered, it was also observed that the fatigue damage of flexible-base foundations was reduced compared to that of fixed-base foundation.
Book Synopsis Fatigue Life Prediction of Composites and Composite Structures by : Anastasios P. Vassilopoulos
Download or read book Fatigue Life Prediction of Composites and Composite Structures written by Anastasios P. Vassilopoulos and published by Woodhead Publishing. This book was released on 2019-10-08 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue Life Prediction of Composites and Composite Structures, Second Edition, is a comprehensive review of fatigue damage and fatigue life modeling and prediction methodologies for composites and their use in practice. In this new edition, existing chapters are fully updated, while new chapters are introduced to cover the most recent developments in the field. The use of composites is growing in structural applications in many industries, including aerospace, marine, wind turbine and civil engineering. However, there are uncertainties about their long-term performance, including performance issues relating to cyclic fatigue loading that hinder the adoption of a commonly accepted credible fatigue design methodology for the life prediction of composite engineering structures. With its distinguished editor and international team of contributors, this book is a standard reference for industry professionals and researchers alike. Examines past, present and future trends associated with the fatigue life prediction of composite materials and structures Assesses novel computational methods for fatigue life modeling and prediction of composite materials under constant amplitude loading Covers a wide range of techniques for predicting fatigue, including their theoretical background and practical applications Addresses new topics and covers contemporary research developments in the field
Book Synopsis Fatigue Life Prediction for Wind Turbines by : TD. Ashwill
Download or read book Fatigue Life Prediction for Wind Turbines written by TD. Ashwill and published by . This book was released on 1994 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind turbines are fatigue-critical machines used to produce electrical energy from the wind. These rotating machines are subjected to combinations of wind, gravity, and gyroscopic loadings that are highly irregular in nature. Historical examples of fatigue problems in both research and commercial wind-turbine development are presented. Some example data on wind-turbine environments, loadings, and material properties are also shown. Before a description of how the authors have chosen to attack the cumulative damage assessment, questions are presented for the reader's reflection. The solution technique used by the authors to define the loading spectrum for wind turbines is then presented. Special emphasis is placed on the development of a loading spectrum for use in the fatigue analysis. Less attention is paid to methods of cumulative damage assessment; Miner's rule and constant amplitude S-n data are used. A case study then applies the procedures to an actual wind-turbine blade joint. The wind turbine is the 34-m diameter vertical axis wind turbine (VAWT) erected by Sandia National Laboratories near Bushland, TX. The case study examines parameter sensitivities for realistic uncertainties in inputs defining the turbine environment, stress response, and material properties. The fatigue lifetimes are calculated using a fatigue analysis program, called LIFE2, which was developed at Sandia.
Book Synopsis The LIFE Computer Code Fatigue Life Prediction for Vertical Axis Wind Turbine Components by : Herbert J. Sutherland
Download or read book The LIFE Computer Code Fatigue Life Prediction for Vertical Axis Wind Turbine Components written by Herbert J. Sutherland and published by . This book was released on 1987 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbine Life Prediction and Reliability: Design and Operation by : Paul S. Veers
Download or read book Turbine Life Prediction and Reliability: Design and Operation written by Paul S. Veers and published by . This book was released on 2018 with total page 13 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 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chances in Wind Energy by : Herman Frederik Veldkamp
Download or read book Chances in Wind Energy written by Herman Frederik Veldkamp and published by . This book was released on 2006 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Case Study and Loading Spectra for Wind Turbines by :
Download or read book Fatigue Case Study and Loading Spectra for Wind Turbines written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper discusses two aspects of Sandia's Wind Energy Program. The first section of the paper presents a case study of fatigue in wind turbines. This case study was prepared for the American Society of Testing Material's (ASTM) Standard Technical Publication (STP) on fatigue education. Using the LIFE2 code, the student is lead through the process of cumulative damage summation for wind turbines and typical data are used to demonstrate the range of life estimates that will result from typical parameter variations. The second section summarizes the results from a workshop held by Sandia and the National Renewable Energy Laboratory (NREL) to discuss fatigue life prediction methodologies. This section summarizes the workshop discussions on the use of statistical modeling to deduce the shape and magnitude of the low-probability-of-occurrence, high-stress tail of the load distribution on a wind turbine during normal operation.
Book Synopsis A Method of Fatigue Life Prediction for Service Extension of Aircraft Structures by : Koenraad Gieskes
Download or read book A Method of Fatigue Life Prediction for Service Extension of Aircraft Structures written by Koenraad Gieskes and published by . This book was released on 2010 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue-life Assessment Methods and Application to the Model WTS-4 Wind Turbine by : S. Murtha-Smith
Download or read book Fatigue-life Assessment Methods and Application to the Model WTS-4 Wind Turbine written by S. Murtha-Smith and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Offshore Compliant Platforms by : Srinivasan Chandrasekaran
Download or read book Offshore Compliant Platforms written by Srinivasan Chandrasekaran and published by John Wiley & Sons. This book was released on 2020-04-06 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to the analysis and design of compliant offshore structures that highlights a new generation of platforms Offshore Compliant Platforms provides an authoritative guideto the analysis and design of compliant offshore structures and puts the focus on a new generation of platforms such as: triceratops, Buoyant Leg Storage and Regasification platforms. Whilst the authors – noted experts on the topic – include basic information on the conceptual development of conventional platforms, the book presents detailed descriptions of the design and development of new deep-water platforms. The book describes the preliminary design of triceratops in ultra-deep waters and presents a detailed analysis of environmental loads that are inherent in offshore locations such as wave, wind and current. The new methodology for the dynamic analysis of triceratops under ice loads, predominantly in ice-covered regions, is also examined with detailed parametric studies. In addition, the book covers the structural geometry and the various methods of analysis for assessing the performance of any other similar offshore platform under the special loads. A discussion of the fatigue analysis and service life prediction is also included. This important book: • Includes the analysis and design of compliant offshore structures with a focus on a new generation of platforms • Examines the preliminary design of triceratops in ultra-deep waters • Covers an analysis of environmental loads that are inherent in offshore locations such as wave, wind and current • Reviews the structural geometry and various methods of analysis for assessing the performance of any other similar offshore platform under special loads • Discusses fatigue analysis and service life prediction Written for engineers and researchers across engineering including civil, mechanical, structural, offshore, ocean and naval architecture, Offshore Compliant Platforms fills the need for a guide to new offshore platforms that provides an understanding of the behaviour of these structures under different loading conditions.
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 2010-09-14 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind energy’s bestselling textbook- fully revised. This must-have second edition includes up-to-date data, diagrams, illustrations and thorough new material on: the fundamentals of wind turbine aerodynamics; wind turbine testing and modelling; wind turbine design standards; offshore wind energy; special purpose applications, such as energy storage and fuel production. Fifty additional homework problems and a new appendix on data processing make this comprehensive edition perfect for engineering students. 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 practising engineers. “provides a wealth of information and is an excellent reference book for people interested in the subject of wind energy.” (IEEE Power & Energy Magazine, November/December 2003) “deserves a place in the library of every university and college where renewable energy is taught.” (The International Journal of Electrical Engineering Education, Vol.41, No.2 April 2004) “a very comprehensive and well-organized treatment of the current status of wind power.” (Choice, Vol. 40, No. 4, December 2002)
Book Synopsis On the Fatigue Analysis of Wind Turbines by : Herbert J. Sutherland
Download or read book On the Fatigue Analysis of Wind Turbines written by Herbert J. Sutherland and published by . This book was released on 1999 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Energy-based Experimental-analytical Torsional Fatiguelife-prediction Method by : John Nicholas Wertz
Download or read book An Energy-based Experimental-analytical Torsional Fatiguelife-prediction Method written by John Nicholas Wertz and published by . This book was released on 2010 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: An energy-based cycle-dependent fatigue life prediction framework for the calculation of torsional fatigue life and remaining life has been developed. The framework for this fatigue prediction method is developed in accordance with previously developed energy-based axial and bending fatigue life prediction approaches, which state: the total strain energy density accumulated during both a monotonic fracture event and cyclic processes is the same material property, where each can be determined by measuring the area beneath the monotonic true stress-strain curve and the area within a hysteresis loop, respectively. The energy-based fatigue life prediction framework is composed of the following entities: (1) the development of a shear fatigue testing procedure capable of assessing cyclic plastic strain energy density accumulation in a pure shear stress state and (2) the incorporation of an energy-based fatigue life calculation scheme to determine the remaining fatigue life of in-service gas turbine materials subjected to pure shear fatigue. Validation of the improved theory was attempted but failed due to undesired axial loading occurring during testing. Future work was proposed to address the issues.
Book Synopsis Stochastic Energy-based Fatigue Life Prediction Framework Utilizing Bayesian Statistical Inference by : Dino Anthony Celli
Download or read book Stochastic Energy-based Fatigue Life Prediction Framework Utilizing Bayesian Statistical Inference written by Dino Anthony Celli and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue life prediction framework developed and described in the proceeding chapters can concurrently approximate both typical stress versus cycle (SN) behavior as well as the inherent variability of fatigue using a limited amount of experimental data. The purpose of such a tool is for the rapid verification and quality assessment of cyclically loaded components with a limited knowledge-base or available fatigue data in the literature. This is motivated by the novelty of additive manufacturing (AM) processes and the necessity of part-specific structural assessment. Interest in AM technology is continually growing in many industries such as aerospace, automotive, or bio-medical but components often result in highly variable fatigue performance. The determination of optimal process parameters for the build process can be an extensive and costly endeavor due to either a limited knowledge-base or proprietary restrictions. Quantifying the significant variability of fatigue performance in AM components is a challenging task as there are many underlying causes including machine-to-machine differences, recycles of powder, and process parameter selection. Therefore, a life prediction method which can rapidly determine the fatigue performance of a material with little or no prior information of the material and a limited number of experimental tests is developed as an aid in AM process parameter optimization and fatigue performance qualification. Predicting fatigue life requires the use of a previously developed and simplistic energy-based method, or Two-Point method, to generate a collection of life predictions. Then the collected life predictions are used to approximate key statistical descriptions of SN fatigue behavior. The approximated fatigue life distributions are validated against an experimentally found population of SN data at 10^4 and 10^6 cycles failure describing low cycle and high cycle fatigue. A Monte Carlo method is employed to model fatigue life by first modeling SN distributions at discrete stress amplitudes using the predicted fatigue life curves. Then the distributions are randomly sampled and a life prediction model is obtained. The approach is verified by using Aluminum 6061 data due to ample material characterization and previous life prediction analysis available in literature. SN life prediction is modeled via a Random Fatigue Limit (RFL) model using least square regression to determine the model coefficients. The life prediction framework is further developed by incorporating Bayesian statistical inference and stochastic sampling techniques to estimate the RFL model parameters. In addition, digital image correlation (DIC) is leveraged during experimentation to collect hysteresis energy as a novel method to monitor hysteresis strain energy or the assumed critical damage variable. Fatigue life prediction is performed in a dynamic way such that the life prediction model is continually updated with the generation of experimental data. The life prediction framework is applied to conventional Aluminum 6061-T6 and AM Inconel 718 and Titanium 6Al-4V. The framework is validated for life prediction and forecasting SN high cycle fatigue behavior using only low cycle fatigue data. The culmination of this work enables the rapid characterization of fatigue of AM materials by concurrently approximating the variation of fatigue life as well as high cycle fatigue behavior with low cycle fatigue data. The benefit of this framework is the significant reduction in experimental testing time, effort, and cost necessary to accurately assess the fatigue behavior of materials with limited prior information and specimen availability, such as in the case with AM Alloys.
Book Synopsis Development of a Practical Fatigue Analysis Methodology for Life Prediction of Rotary-Wing Aircraft Components by :
Download or read book Development of a Practical Fatigue Analysis Methodology for Life Prediction of Rotary-Wing Aircraft Components written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical fatigue analysis methodology was developed for predicting the life of rotary-wing aircraft components. The focus of this fatigue capability was two-fold. First, to gain insight into the current life prediction methodologies and their use, and second, to be able to predict the service life of aircraft components and determine if reworked parts are suitable for continued service. Commercially available software, ANSYS and Fe-safe, were utilized as the finite element and fatigue life prediction solvers, respectively. It was demonstrated that the predicted fatigue life on aircraft components can be performed with reasonable accuracy and efficiency by utilizing commercially available software. This methodology was first demonstrated by investigating the predicted fatigue life of a flat plate with a centrally located hole under constant amplitude and variable amplitude loading. This approach was validated by comparing simulated life predictions using several stress-life and strain-life algorithms with previously published experimental data. In addition, an illustrative helicopter main gear drag beam was analyzed and the effect on fatigue life due to a reduction in the beam thickness was demonstrated. This research had demonstrated that a fatigue life methodology can be successfully utilized to predict the service life of aircraft components in a practical manner and to determine if reworked parts are suitable for continued service.
