ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Overview of Wind Energy Systems: Issues in Development and Application (1981)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1981-02-01
    Description: An overview of the current status of wind energy technology and system development is presented with major emphasis placed on the key issues which face the commercialization of wind technology. The basic fundamentals of the technology are reviewed and the direction of current development is outlined. Economic considerations are discussed both from a machine development point of view and the utility-industry cost-of-service approach. In addition, the problems associated with wind turbine performance testing are discussed and a short review of operational experience is provided. These topics are all considered in the context of providing the reader with an understanding of wind system technology, a general knowledge of current problems, and the expected trends for the future. Many of these important issues are still under intensive investigation, and in some cases, a clearly superior solution has not emerged. In these circumstances, the value judgments are properly left to the reader.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    A Comparison of Predicted Wind Turbine Blade Loads to Test Measurements (1988)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1988-08-01
    Description: The accurate prediction of wind turbine blade loads and response is important in predicting the fatigue life of wind machines. At the SERI Wind Energy Research Center, a rotor code called FLAP (Force and Loads Analysis Program) is currently being validated by comparing predicted results to machine measurements. The FLAP code has been modified to allow the teetering degree of freedom. This paper describes these modifications and comparisons of predicted blade bending moments to test measurements. Wind tunnel data for a 1/20th scale model will be used to compare FLAP predictions for the cyclic flap-bending moments at the 33 percent spanwise station for three different wind speeds. The comparisons will be made for both rigid and teetering hubs. Currently, the FLAP code accounts for deterministic excitations such as wind shear, tower shadow, gravity, and prescribed yawing motions. Conclusions will be made regarding the code’s accuracy in predicting the cyclic bending moments.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    A Computer Analysis of Wind Turbine Blade Dynamic Loads (1986)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1986-02-01
    Description: The flapping motion of a single wind turbine rotor blade has been analyzed and equations describing the flapping motion have been developed. The analysis was constrained to allow only flapping motions for a cantilevered blade, and the equations of motion are linearized. A computer code, called FLAP (Force and Loads Analysis Program), to solve the equations of motion and compute the blade loads, has been completed and compared to measured loads for a 3-bladed downwind turbine with stiff blades. The results of the program are presented in tabulated form for equidistant points along the blade and equal azimuth angles around the rotor disk. The blade deflection, slope and velocity, flapwise shear and moment, edgewise shear and moment, blade tension, and blade torsion are given. The deterministic excitations considered in the analysis include wind shear, tower shadow, gravity, and a prescribed yaw motion.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    Structural Dynamic Analysis of Wind Turbine Systems (1982)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1982-05-01
    Description: The paper presents an overview of the dynamic analysis of horizontal axis wind turbines. The major emphasis of the paper is the review of current analysis methods and the comparison of results with experimental data. The current capabilities for predicting turbine system natural frequencies are discussed and the design implications of frequency placement are reviewed. The prediction of cyclic loads, using the dynamic analysis computer codes, is examined and comparisons are made between the code predictions and field test data. Finally, the dynamic analysis needs for advanced turbine systems are considered.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Prediction of Stochastic Blade Responses Using Measured Wind-Speed Data as Input to the Flap Code (1990)
    American Society of Mechanical Engineers
    Details
    Publication Date: 1990-11-01
    Description: Accurately predicting wind turbine blade loads and response is important in predicting the fatigue life of wind turbines. The necessity of including turbulent wind effects in structural dynamics models has long been recognized. At SERI, the structural dynamics model, or FLAP (Force and Loads Analysis Program), is being modified to include turbulent wind fluctuations in predicting rotor blade forces and moments. The objective of this paper is to show FLAP code predictions compared to measured blade loads using actual anemometer array data and a curve-fitting routine to form series expansion coefficients as the turbulence input to FLAP. The predictions are performed for a three-bladed upwind field test turbine. An array of nine anemometers was located 0.8 rotor diameters (D) upwind of the turbine, and data from each anemometer are used in a least-squares curve-fitting routine to obtain a series expansion of the turbulence field over the rotor disk. Three 10-min data cases are used to compare FLAP predictions to measured results. Each case represents a different mean wind speed and turbulence intensity. The time series of coefficients in the expansion of the turbulent velocity field are input to the FLAP code. Time series of predicted flap-bending moments at two blade radial stations are obtained, and power spectra of the predictions are then compared to power spectra of the measured blade bending moments. Conclusions are then drawn about the FLAP code’s ability to predict the blade loads for these three data cases. Recommendations for future work are also made.
    Print ISSN: 0199-6231
    Electronic ISSN: 1528-8986
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by American Society of Mechanical Engineers
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    The partially closed Griffith crack (1973)
    Springer
    Details
    Publication Date: 1973-03-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    Electronic Resource
    Electronic Resource
    The partially closed Griffith crack (1973)
    Springer
    International journal of fracture 9 (1973), S. 33-41 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On présente une solution pour le cas d'une fissure de Griffith soumise à une fonction de charge de forme arbitrairement polynomiale et telle que l'une des extrémités de la fissure ne s'ouvre pas. Des expressions de forme fermée sont proposées pour la longueur d'ouverture de la fissure et pour les contraintes et déplacements dans le plan de celle-ci. Le cas particulier de la flexion pure est présenté à titre d'exemple et, pour ce cas, on calcule le facteur d'intensité de contrainte.
    Abstract: Zusammenfassung Man schlägt eine Lösung vor für den Fall eines Griffith-Risses welcher einer Lastfunktion arbiträrer polynomialer Form unterworfen ist, wobei eines der Rißenden sich nicht öffnet. Es werden Ausdrücke in einer geschlossenen Form sowohl für die Offnungslänge des Risses, als auch für die Spannungen und die Verschiebungen in der Rißebene vorgeschlagen. Als Beispiel wird der Fall einer reinen Biegung crörtert und es wird für dieses Beispiel der Spannungsintensitätsfaktor berechnet.
    Notes: Abstract A solution is presented for a Griffith crack subjected to an arbitrary polynomial loading function which causes one end of the crack to remain closed. Closed form expressions are presented for the crack opening length and for the stress and displacements in the plane of the crack. The special case of pure bending is presented as an example and for this case the stress intensity factor is computed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035953
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...