Acoustic Emission Monitoring of Small Wind Turbine Blades

Author:

Joosse P. A.1,Blanch M. J.2,Dutton A. G.2,Kouroussis D. A.3,Philippidis T. P.4,Vionis P. S.5

Affiliation:

1. Delft University of Technology, WMC-Group, Stevinweg 1, 2628 CN Delft, The Netherlands

2. Energy Research Unit, CLRC Rutherford Appleton Laboratory (CLRC-RAL), Chilton, Didcot, Oxon OX11 0QX, UK

3. Envirocoustics Abee, El. Venizelou 7 and Delfon, Metamorphosi, Athens 14452, Attica, Greece

4. Dept of Mechanical Engineering & Aeronautics, University of Patras, P.O. Box 1401, Patras 265 00, Greece

5. CRES, Wind Energy Department, 19th km Marathon Avenue, Pikermi 19009, Attica, Greece

Abstract

Wind turbine blade certification tests often generate sudden audible cracking sounds from somewhere within the blade, without the operators being able to locate the noise source or to evaluate the existence or the extent of any damage. It would be beneficial to be able to detect any damage incurred by the blade, whether it is accompanied by audible noise or not. The current project, named AEGIS, is looking at the possibility of using acoustic emission monitoring during testing of fiber composite blades to detect the source of damage events and assess the blade condition. The test methodology is discussed in the context of the blade certification procedure and results are presented from a series of static and fatigue blade tests to failure in the laboratory.

Publisher

ASME International

Subject

Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment

Reference11 articles.

1. IEC 61400-1, 1998, “Wind Turbine Generator Systems-Part 1: Safety Requirements”

2. IEC 61400-23 TS Ed.1, 1999, “Wind Turbine Generator Systems-Part 23: Full Scale Structural Testing of Rotor Blades for WTGS’s,” Draft.

3. Beattie, A.G., 1997, “Acoustic Emission Monitoring of a Wind Turbine Blade During the Fatigue Test,” 1997 AIAA Aerospace Sciences Meeting.

4. Sutherland, H., Beattie A.G., Hansche, B., Musial, W., Allread, J., Johnson, J., and Summers, M., 1994, “The Application of Non-destructive Techniques to the Testing of a Wind Turbine Blade,” Report SAND93-1380, Sandia National Laboratory.

5. Vionis, P.S., Anastassopoulos, A.A., Kolovos, V.K., and Kouroussis, D.A., 1999, “Non-Destructive Testing of Full Scale w/t Blade by Means of Acoustic Emission Monitoring During Controlled Static Loading,” Paper PB9.23, Proc. EWEC 1999, E.L. Petersen and P.H. Jensen, (eds), James & James Ltd., London, pp. 691–694.

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