Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Dynamic Response Analysis Of A 900 Kw Wind Turbine Subject To Ground Excitation
Download Dynamic Response Analysis Of A 900 Kw Wind Turbine Subject To Ground Excitation full books in PDF, epub, and Kindle. Read online Dynamic Response Analysis Of A 900 Kw Wind Turbine Subject To Ground Excitation ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Dynamic Response Analysis of a 900 KW Wind Turbine Subject to Ground Excitation by : Adrian Felix Caudillo
Download or read book Dynamic Response Analysis of a 900 KW Wind Turbine Subject to Ground Excitation written by Adrian Felix Caudillo and published by . This book was released on 2012 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis exhibits the results of a study focused on the seismic behavior of a 900 kW wind turbine. As of the time of this writing, special engineering provisions for such loading events are not adequately defined. In order to accomplish the research objective, the author relies on available experimental data taken in 2009 from accelerometers attached to a wind turbine base and tower along with an eccentric mass shaker placed on the turbine foundation. On this basis, the dynamic properties of the wind turbine, including tower bending modes and natural frequencies were extracted. An attempt was made to quantify the damping ratios found in these bending modes by applying input shaking simulating the experimental excitation using the finite element program OpenSees. In this undertaking, possible sources of error are discussed. The author then describes a numerical study performed on a calibrated wind turbine like structure involving the application of a large range of actual recorded input motions. Adjustments are made to the original fixed-base model, placing the structure on a linearly elastic soil domain by using BridgePBEE, a graphical interface tool that eases simulation and functions as a pre and post processor. Using this code, the numerical study is further extended by varying the supporting ground stiffness. The study then compares the tower maximal shear and moment values for the studied rigid and flexible ground scenarios and explores trends in the lateral force lever-arm of the system.
Book Synopsis An Experimental and Numerical Study of Wind Turbine Seismic Behavior by : Ian Prowell
Download or read book An Experimental and Numerical Study of Wind Turbine Seismic Behavior written by Ian Prowell and published by . This book was released on 2011 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents an experimental and numerical investigation into the seismic response of modern wind turbines. Currently, no consensus exists in the industry and there is significant interest in improving prediction of the behavior of wind turbines simultaneously subjected to wind, earthquake, and operational excitation. To this end, an experimental program was planned in order to evaluate seismic loading of wind turbines. In 2004, a preliminary shake table test of a 65-kW utility scale wind turbine was conducted that provided an experimental basis to begin the work discussed herein. A monitoring campaign was performed at Oak Creek Energy Systems in Mojave, California to assess variability of in-situ dynamic characteristics of two modern wind turbines (900-kW and 1.5-MW rated power) under different operational states and wind conditions. A second shake table experiment with a more extensive test program and improved instrumentation was executed, in which orientation of shaking and operational state were found to significantly influence response. Using the finite element program OpenSees, beam-column models of the tested specimens were constructed and calibrated. Collected data provided a basis to show that such a model could reproduce salient characteristics including natural frequencies, mode shapes, and dynamic response time histories for a parked turbine. In-situ results were used to guide construction of full turbine-foundation-soil models that provided insight into soil-structure interaction phenomena. An existing tool to simulate turbine dynamics, the FAST code, was extended to include seismic loading to allow simulation of operational turbines subjected to base shaking and validated based on shake table results. Using a calibrated model of the tested 900-kW turbine it is shown that neglecting aerodynamics results in significant over estimation of the tower bending demand. An investigation of turbines ranging from 65-kW to 5-MW concluded that consideration of aerodynamics and operational state becomes increasingly important with size. The updated FAST code was demonstrated to accurately reproduce observed dynamics of operating turbines, providing a validated tool for seismic design of turbines. These contributions clarify that operational state and orientation of shaking are important considerations and enable the development of a new generation of turbines that appropriately consider seismic loads.
Book Synopsis A Comparison of Results from Dynamic-response Field Tests by : Susan M. Hock
Download or read book A Comparison of Results from Dynamic-response Field Tests written by Susan M. Hock and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic response of Howden's 3 30-kW horizontal axis wind turbine (HAWT) and the Northern Power Systems 100-kW 'North Wind 100' HAWT has been measured. The Howden machine incorporates a 26-m-diameter, upwind, three-bladed, wood/epoxy rotor that operates at 42 rpm and is a rigid-hub design. The North Wind 100 rotor has a diameter of 17.8 m, is upwind, two-bladed, and constructed of fiberglass, and has a teetered hub. The Northern Power turbine's blades are fully pitchable, while the Howden machine uses pitchable blade tips. This paper will present the results from each of these test programs in an effort to compare the dynamic response of each turbine. The analysis will focus on rotor bending loads in terms of both time domain and frequency response. The FLAP code will be used to explore sensitivity to teeter stiffness and natural frequency placement to provide a better understanding of the differences in behavior caused by configuration alone. The results are presented in the form of normalized azimuth-averaged plots of the deterministic loads, and spectral density plots of the stochastic responses. This presentation of the results will contrast major response differences due to design configurations.
Book Synopsis The Influence of Earthquake Ground Motion on Wind Turbine Loads by : Himanshu Arora
Download or read book The Influence of Earthquake Ground Motion on Wind Turbine Loads written by Himanshu Arora and published by . This book was released on 2011 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of wind turbines installed in various regions of the world where earthquakes are likely must take into account loads imposed on the turbine due to ground shaking. Currently, design standards such as the International Electrotechnical Commission's standard, IEC 61400-1, do not provide detailed guidelines for assessing loads on wind turbines due to seismic input excitation. In regions of high seismic hazard, it is extremely important to perform a thorough seismic analysis. Various simplified and full-system wind turbine models have been published and used for seismic analysis of turbine loads in recent years. Among these models, the open-source software, FAST, allows for full-system simulation of the response of wind turbines subjected to earthquake ground motion along with other sources of loading such as from the mean wind field and turbulence. This study employs this open-source software to simulate seismic loads and presents statistical and spectral summaries resulting from extensive analyses undertaken by simulating turbine response to various input motions from Western U.S. earthquakes. A total of 150 different earthquake ground motion records with varying magnitude and distance from fault rupture are selected and normalized/scaled to selected target levels prior to response simulation using a utility-scale 5-MW wind turbine model. The records selected are divided into six groups of 25 records each; the groups consist of different magnitude and distance-to-rupture values. The records in each bin are scaled to have similar demand levels as the average of the demand of the unscaled records in that bin. Two different normalization options are considered -- in one, the scaling is at the rotor rotation rate (or the once-per-rev or 1P frequency); in the other, the scaling is done at the tower fore-aft first mode frequency. A study of various turbine load measures is conducted. It is found that turbine tower loads, in particular, are especially influenced by the earthquake excitation.
Book Synopsis Dynamic Response of a 330-kW Horizontal Axis Wind Turbine Generator by : M. Wehrey
Download or read book Dynamic Response of a 330-kW Horizontal Axis Wind Turbine Generator written by M. Wehrey and published by . This book was released on 1988 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Response of a 330 Kw Horizontal Axis Wind Turbine Generator by : I. Redmond
Download or read book Dynamic Response of a 330 Kw Horizontal Axis Wind Turbine Generator written by I. Redmond and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Dynamic Response of a Westinghouse 600-kW Wind Turbine by : A. L. Snow
Download or read book The Dynamic Response of a Westinghouse 600-kW Wind Turbine written by A. L. Snow and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Results from the Dynamic Response Testing of the Howden 330-kW HAWT by :
Download or read book Preliminary Results from the Dynamic Response Testing of the Howden 330-kW HAWT written by and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the Department of Energy (DOE) Cooperative Field Test Program, Southern California Edison (SCE) and the Solar Energy Research Institute (SERI) performed a comprehensive dynamic response test on the 330-kW, horizontal-axis wind turbine (HAWT) manufactured by the James Howden Company. This paper presents a preliminary analysis of some data from the test. The data were analyzed using different statistical approaches. First, the mean turbine operating conditions were analyzed using the method of bins. In addition, azimuth averaging was used to separate the deterministic responses from the stochastic responses. The results presented include comparisons of mean power and load versus wind speed. Deterministic rotor-bending loads are plotted as a function of blade azimuth position. Auto-spectral density plots are also computed for the stochastic portion of the rotor blade root-bending moments to determine their dynamic responses to turbulent wind inputs.
Book Synopsis Dynamic Behavior of Operational Wind Turbines Considering Aerodynamic and Seismic Load Interaction by : Mohammad-Amin Asareh
Download or read book Dynamic Behavior of Operational Wind Turbines Considering Aerodynamic and Seismic Load Interaction written by Mohammad-Amin Asareh and published by . This book was released on 2015 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: "With the advancements in the wind energy production industry, the demand for a cost effective and safe design of wind turbine structures is growing rapidly. The wide deployment of wind turbines in locations with high seismic hazard has lead engineers to take into account a more comprehensive seismic design of such structures. In response to the need for a computational tool that can perform coupled simulations of wind and seismic loads, a seismic module has been developed for the publicly available National Renewable Energy Laboratory (NREL) code, FAST, at the first step of this research. This achievement allows engineers working in this industry to directly consider interaction between seismic and other environmental loads for turbines with a freely available simulation tool. The first paper details the practical application and theory of these enhancements and provides examples for the use of different capabilities. The platform is then used to show the suitable earthquake and operational load combination with the implicit consideration of aerodynamic damping by estimating appropriate load factors. In the next step, the developed platform is used to evaluate the effects of aerodynamic and seismic load coupling on the power generation and structural dynamics behavior of wind turbines. Various turbine operation scenarios such as (i) normal operational condition, (ii) idling, and (iii) earthquake induced emergency shutdown are simulated to show the differences in generated power and dynamic response of wind turbine structures. The effects of aerodynamic damping and pitch control system are presented which show reduction in the resulting design demand loads. In the last step, a finite element model of the turbine which is calibrated with the previously implemented code is used to evaluate the fragility of wind turbines under seismic and wind excitation. This is obtained by the assessment of nonlinear dynamic behavior of a 5-MW NREL wind turbine considering different earthquake and wind intensities using the finite element model. Engineering Demand Parameters (EDP) and Intensity Measures (IM) are then obtained from Incremental Dynamic Analysis (IDA) and used to assess the probability of exceeding different Damage States (DS) using fragility curves."--Abstract, page iv.
Book Synopsis Earthquake Response Modeling for a Parked and Operating Megawatt-scale Wind Turbine by :
Download or read book Earthquake Response Modeling for a Parked and Operating Megawatt-scale Wind Turbine written by and published by . This book was released on 2010 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demand parameters for turbines, such as tower moment demand, are primarily driven by wind excitation and dynamics associated with operation. For that purpose, computational simulation platforms have been developed, such as FAST, maintained by the National Renewable Energy Laboratory (NREL). For seismically active regions, building codes also require the consideration of earthquake loading. Historically, it has been common to use simple building code approaches to estimate the structural demand from earthquake shaking, as an independent loading scenario. Currently, International Electrotechnical Commission (IEC) design requirements include the consideration of earthquake shaking while the turbine is operating. Numerical and analytical tools used to consider earthquake loads for buildings and other static civil structures are not well suited for modeling simultaneous wind and earthquake excitation in conjunction with operational dynamics. Through the addition of seismic loading capabilities to FAST, it is possible to simulate earthquake shaking in the time domain, which allows consideration of non-linear effects such as structural nonlinearities, aerodynamic hysteresis, control system influence, and transients. This paper presents a FAST model of a modern 900-kW wind turbine, which is calibrated based on field vibration measurements. With this calibrated model, both coupled and uncoupled simulations are conducted looking at the structural demand for the turbine tower. Response is compared under the conditions of normal operation and potential emergency shutdown due the earthquake induced vibrations. The results highlight the availability of a numerical tool for conducting such studies, and provide insights into the combined wind-earthquake loading mechanism.
Book Synopsis Preliminary Results from the Dynamic Response Testing of the Howden 330-kw HAWT (horizontal-axis Wind Turbine). by :
Download or read book Preliminary Results from the Dynamic Response Testing of the Howden 330-kw HAWT (horizontal-axis Wind Turbine). written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of the Department of Energy (DOE) Cooperative Field Test Program, Southern California Edison (SCE) and the Solar Energy Research Institute (SERI) performed a comprehensive dynamic response test on the 330-kW, horizontal-axis wind turbine (HAWT) manufactured by the James Howden Company. This paper presents a preliminary analysis of some data from the test. The data were analyzed using different statistical approaches. First, the mean turbine operating conditions were analyzed using the method of bins. In addition, azimuth averaging was used to separate the deterministic responses from the stochastic responses. The results presented include comparisons of mean power and load versus wind speed. Deterministic rotor-bending loads are plotted as a function of blade azimuth position. Auto-spectral density plots are also computed for the stochastic portion of the rotor blade root-bending moments to determine their dynamic responses to turbulent wind inputs. 2 refs., 14 figs., 5 tabs.
Book Synopsis Preliminary Results from the Dynamic Response Testing of the Northern Power Systems 100-kW Wind Turbine by : Richard M. Osgood
Download or read book Preliminary Results from the Dynamic Response Testing of the Northern Power Systems 100-kW Wind Turbine written by Richard M. Osgood and published by . This book was released on 1988 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Solar Energy Research Institute (SERI), in cooperation with Northern Power Systems (NPS), conducted a series of dynamic response tests on the NPS 100kW Wind Turbine as part of the Department of Energy's (DOE) Cooperative Field Test Program. This paper presents a preliminary rev1ew of the test data, including average and cyclic machine response characteristics. The mean turbine operating conditions are analyzed as a function of mean wind speed and rotor azimuth position using the method of bins. Rotor bending loads are also presented in the frequency domain to investigate the relative effects of low- and high-frequency wind turbulence.
Book Synopsis Aeroelastic Stability and Dynamic Response Analysis of the LDB-125 Vertical Axis Wind Turbine by : Arne Vollan
Download or read book Aeroelastic Stability and Dynamic Response Analysis of the LDB-125 Vertical Axis Wind Turbine written by Arne Vollan and published by . This book was released on 1982 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Results from the Dynamic-response Testing of the Westinghouse 600-kW Wind Turbine by : Susan M. Hock
Download or read book Preliminary Results from the Dynamic-response Testing of the Westinghouse 600-kW Wind Turbine written by Susan M. Hock and published by . This book was released on 1987 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides a preliminary look at test data from a Westinghouse 600-kW wind turbine. The Westinghouse machine was fitted with instrumentation to record machine data, as well as wind and atmospheric conditions. Wind data were collected from five levels of anemometers mounted on a meteorological tower upwind of the turbine. Because of problems encountered while digitizing the data, this paper presents results from a very limited number of channels and time-series data segments. Three sets of 10-minute data segments are presented that cover power, pitch angle, and blade loads. Because of the narrow scope of this analysis, the following conclusions should be considered tentative: (1) Energy production appears to be somewhat better than predicted. (2) The teetering hub appears to be operating as expected, and the rotor is teetering to eliminate much of the loading caused by the mean wind shear in the inflow. (3) A large part of the flapping-moment variation is caused by low-frequency turbulence in the inflow.
Book Synopsis Dynamic Response of Power Generating Wind Turbines to Wind Speed Changes by : David W. Adkins
Download or read book Dynamic Response of Power Generating Wind Turbines to Wind Speed Changes written by David W. Adkins and published by . This book was released on 1977 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Response of Wind Turbine Tower Assemblies by : Paul J. Murtagh
Download or read book Dynamic Response of Wind Turbine Tower Assemblies written by Paul J. Murtagh and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Analysis of Both on and Offshore Wind Turbines in the Frequency Domain by : Andrew Halfpenny
Download or read book Dynamic Analysis of Both on and Offshore Wind Turbines in the Frequency Domain written by Andrew Halfpenny and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
