LOADS ON WIND TURBINES ACCESS PLATFORMS WITH GRATINGS
Proceedings of the 32nd International Conference
PDF

Keywords

offshore wind
run-up
slamming
entrance platforms
grates
large scale tests

How to Cite

Lykke Andersen, T., Frigaard, P., Rasmussen, M. R., & Martinelli, L. (2011). LOADS ON WIND TURBINES ACCESS PLATFORMS WITH GRATINGS. Coastal Engineering Proceedings, 1(32), structures.65. https://doi.org/10.9753/icce.v32.structures.65

Abstract

The present paper deals with loads on wind turbine access platforms. The many planned new wind turbine parks together with the observed damages on platforms in several existing parks make the topic very important. The paper gives an overview of recently developed design formulae for different types of entrance platforms. Moreover, the paper present new results on loads on grates based on both drag coefficient measurements and preliminary results on slamming from large scale tests. As expected both investigations show that platforms with grates give a significant reduction in the loads compared to closed plate platforms. The grate multiplication factor, defined as the peak load on the grate platform relative to the peak load on a closed plate platform was found approximately equal to the solidity of the grate.
https://doi.org/10.9753/icce.v32.structures.65
PDF

References

Annand, W. J. D. (1953). The Resistance to Air Flow of Wire Gauzes. Journal of the Royal Aeronautical Society, Vol. 57, p. 141-146.

De Vos, L., Frigaard, P. and De Rouck, J. 2007. Wave run-up on cylindrical cone shaped foundations for offshore wind turbines. Coastal Engineering 54 (1), 17-29, Elsevier.http://dx.doi.org/10.1016/j.coastaleng.2006.08.004

Idelchik, I. E. (2003). Handbook of Hydraulic Resistance. CRC Begell House.

Lykke Andersen, T. and Frigaard, P. 2006a. Horns Rev II, 2-D Model Tests.Wave Run-Up on Pile. DCE Contract Report No. 3, Dept. of Civil Engineering, Aalborg University.

Lykke Andersen, T. and Brorsen, M. 2006. Horns Rev II, 2-D Model Tests. Impact Pressures on Horizontal and Cone Platforms. DCE Contract Report No. 4, Dept. of Civil Engineering, Aalborg University.

Lykke Andersen, T. and Brorsen, M. 2007. Horns Rev II, 2-D Model Tests. Impact Pressures on Horizontal and Cone Platforms from Irregular Waves DCE Contract Report No. 13, Dept. of Civil Engineering, Aalborg University.

Lykke Andersen, T., Rasmussen, M. R. and Frigaard, P. 2007b. Detailed Investigations of Load Coefficients on Grates. Influence of Air and Angle of Attack. DCE Contract Report No. 22, Aalborg University.

Lykke Andersen, T. and Rasmussen, M. 2008. Access Platforms for Offshore Wind Turbines Using Gratings. Proc. 8th International Congress on Advances in Civil Engineering, Famagusta, North Cyprus, p. 379-386.

Lykke Andersen, T., Frigaard, P., Damsgaard, M.L. and De Vos, L. Wave Run-Up on Slender Piles in Design Conditions - Model Tests and Design Rules for Offshore Wind. Coastal Engineering, Elsevier (submitted)

Morgan, P. G. (1962). Flow through screens of low solidity. Journal of the Royal Aeronautical Society, Vol. 66, p. 54-56.

Nielsen, A.W., Mortensen, S.B., Jacobsen, V. and Damgaard Christensen, E. 2008. Numerical Modelling of Wave Run-Up on a Wind Turbine Foundation. Proc. Of the ASME 27th Int. Conf. on Offshore and Arctic Engineering, Estoril, Portugal, p. 597-603.

Richards, P. J. & Robinson, M. (1999). Wind Loads on Porous Structures. Journal of Wind Engineering and Industrial Aerodynamics 83, p. 455-465.http://dx.doi.org/10.1016/S0167-6105(99)00093-8

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.