Abstract
Wind turbine installations are increasing significantly in numbers as well as capacity as part of the global demand for sustainable energy sources. This leads to stronger need for comprehensive dynamic test data to support reliable cost reductions while meeting safety requirements. The complete wind turbine structural mechanical response at different load conditions is of particular interest. Detailed analysis of the component operational resonances during loading, such as the interaction of the blade - and tower deformations is of basic engineering importance. A testing of the structure with traditional equipment would be quite extensive in sensor instrumentation, calibration and analysis effort. Dynamic field measurements were performed on a 500 kW Nordtank wind turbine at the Risoe DTU campus in Denmark using a customized Pontos point tracking photogrammetry system. Data was acquired at 100 Hz for 7 seconds from more than 50 targets within a 50 meter wide field of view. Practical aspects of the measurement setup including illumination requirements, blade and tower targeting, the ability to automatically track numerous targets through multiple rotations, rigid body correction (de-rotation), and the use of projected angles and trajectory analysis are discussed. Results include movies with animated vectors and associated time history plots for 3D directional and resultant displacements of all blades and the support tower, as well as trajectory plots.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
1) IEC 61400–13 Wind Turbine Generator Systems - Part 13: Measurement of Mechanical Loads
2) Andersen, P., Brincker, R., The Stochastic Subspace Identification Techniques. www.svibs.com.
3) Overschee, E. and de Moor, P. Subspace Identification for Linear Systems: Theory, Implementation, Applications. Kluwer Academic Publishers, 1996.
4) Ventura C. E. and Gade, S., IOMAC Pre-Course. IOMAC 2005. Copenhagen, Denmark, April 2005.
5) Andersen, P. Identification of Civil Engineering Structures Using ARMA Models, Ph.D. Thesis, Aalborg University, Denmark, 1997.
6) Gade, S., Modal Parameters from a Wind Turbine Wing by Operational Modal Analysis. Internoise, Korea, 2003.
7) Larsen, G.C. et al. Modal Analysis of Wind Turbine Blades. Risø-R-1181(EN), 2002.
8) Døssing, Ole, Structural Stroboscopy -Measurement of Operational Deflection Shapes, Brüel & Kjær Application Note (BO 0212).
9) Gatzwiller, K. B&K Application Note, Measuring Torsional Operational Deflection Shapes of Rotating Shafts. BO 0402. www.BKSV.com.
10) Bendat, J. et al. Random Data: Analysis and Measurement Procedures. Wiley – Interscience, 1971.
11) McHargue, P. L., Richardson, M.H. Operating Deflection Shapes from Time versus Frequency Domain Measurements. 11th IMAC Conference Florida USA, 1993.
12) Richardson, M.H. Is It a Mode Shape or an Operating Deflection Shape? Sound & Vibration, 1997.
13) Helgesen, K.O.et al, Wind Turbine Measurement Technique-an Open Laboratory for Educational Purposes, Wind Energy 11 pp.281-295 Wiley Interscience, 2006.
14) Paulsen. S., Preliminary Results with A Novel Drive Train Measurement System, EWEC2008, Brussels, Belgium, 2007.
15) Erne, O, Friebe, H., and Galanulis, K., Is it possible to replace conventional displacement and acceleration sensor technology? Solution methods using optical 3D measuring technology, GOM white paper, 2007.
16) Schmidt, T., Tyson, J., Some Common and Not So Common Applications of 3D Image Correlation, Proceedings of the GOM International User Meeting, Braunschweig, Germany, Sept 25, 2007.
17) Helfrick, M., Niezrecki, C., and Avitabile, P., “Optical Non-contacting Vibration Measurement of Rotating Turbine Blades,” Proceedings of IMAC-XXVII, Orlando, FL, February 2009.
18) Helfrick, M., Niezrecki, C., Avitabile, P., and Schmidt, T., “3D Digital Image Correlation Methods for Full-Field Vibration Measurement,” Proceedings of IMAC-XXVI, Orlando, FL, February 2008.
19) Niezrecki and Avitable, Digital Image Correlation Applied to Structural Dynamics, Proceedings of IMACXXVII, Orlando, FL, February 2009.
20) Pickrel, C.R., A Possible Hybrid Approach for Modal Testing of Aircraft, Proceedings of IMAC-XXVII, Orlando, FL, February 2009.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 The Society for Experimental Mechanics, Inc.
About this paper
Cite this paper
Paulsen, U.S., Schmidt, T., Erne, O. (2011). Developments in Large Wind Turbine Modal Analysis Using Point Tracking Videogrammetry. In: Proulx, T. (eds) Structural Dynamics and Renewable Energy, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9716-6_17
Download citation
DOI: https://doi.org/10.1007/978-1-4419-9716-6_17
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4419-9715-9
Online ISBN: 978-1-4419-9716-6
eBook Packages: EngineeringEngineering (R0)