Rotorblade Competence Center

Transkript

1 Rotorblade Competence Center Dr. Alexandros Antoniou Innovative condition monitoring for complex composite structures (blades) in Wind turbines

2 The Fraunhofer-Institute in Germany 60 institutes at 42 locations employees Bremerhaven Hannover Potsdam Berlin Teltow Braunschweig Magdeburg Cottbus Oberhausen Dortmund Halle Schkopau Leipzig Duisburg Schmallenberg Dresden Aachen St. Augustin Jena Euskirchen Chemnitz Wachtberg Ilmenau Darmstadt WürzburgErlangen St. Ingbert Kaiserslautern Fürth Nürnberg SaarbrückenKarlsruhe Pfinztal Ettlingen Stuttgart Freising Freiburg München Holzen Efringen- Kirchen Bremen Itzehoe Lübeck Rostock Holzkirchen

3 Research network for Wind energy Steering Committee Research Network for Windenergy Plan for 2013: 250 employees in IWES and 250 in the partner universities Fraunhofer-Institut for Windenergy and Energy System Techniques Brem erhav en Com petence fields Mechanical Engineering Material Science Offshore-Messur. Techniques Technical Reliability Hannov er Civil Engineering Oldenburg Aerodynamic Kassel Com petence fields Electrical Engineering Regulators Power systems Engineering Electrical Network Technologies and Information-processing Partner universities of the research network Antriebstechnik Bauingenieurwesen Physik des Windes Elektrotechnik ForWind-Network Northwest-Germany

4 Rotor blade: Structure Complex structures Composites (Glass Carbon/Epoxy, Polyester ) Foam, Balsa wood Adhesives Metalic parts Lightning protection Composites Damage tolerant materials w w.gurit.com/files/docum ents/5_gurit_materials.pdf

5 Rotor blade: Damage & Intrinsic Flaws Damage due to loading Matrix cracks Cracks in the adhesive (transverse & kissing bonds ) Delaminations Panel instabilities Lightning strikes Flaws due to manufacruting w w.gurit.com/files/docum ents/5_gurit_materials.pdf Dry plies Disbonds in adhesive joints Voids in the adhesives Fiber waviness

6 Rotor blade: Why condition monitoring? Monitor material performance Plan maintenance effectively i.e. find the appropriate time window minimize down time stop the WT when needed Avoid major failures Save costs WTRB records. Valiable for insurances and investors

7 Condition monitoring: lab Condition Monitoring Non Destructive Testing/Inspection (NDT/NDI) Structural Health Monitoring Material & component test Full scale blade test

8 Condition monitoring: in situ Condition Monitoring Non Destructive Testing/Inspection (NDT/NDI) Structural Health Monitoring

9 Condition monitoring: NDT o Local Visual Inspection Bear eyes Endoscope/Videoscopy Taping Coin Shearography Digital Image Correlation Ultrasonics Pulse Echo Through transmission Acousto Ultrasonics o Global Vibrations Thermal Cameras Computer Tomography Ultrasonics Acoustic Emission

10 Condition monitoring: SHM o Local Strain Gauges FBGs o Global Vibrations Thermal Cameras Computer Tomography Ultrasonics Acoustic Emission

11 Typical results: NDT o Conventional Ultrasonics Delamination

12 Typical results: NDT o Conventional Ultrasonics Disbonds Disbonds

13 Typical results: NDT & SHM o Acoustic Emission Detect, locate & monitor bond line failure Transverse bondline cracks Disbond: Bondline - SW

14 Discusion Increased manufacturing reliability needs NDT Increased operating reliability needs NDT SHM Available solutions in the market Scientific and applied research projects on going (SHM Wind, Blade Tester...)

15 Acknowlegement DAS FRAUNHOFER IWES WIRD VON DEM LAND BREMEN SENATOR FÜR UMWELT, BAU, VERKEHR UND EUROPA SENATOR FÜR WIRTSCHAFT UND HÄFEN SENATORIN FÜR BILDUNG UND WISSENSCHAFT BIS BREMERHAVENER GESELLSCHAFT FÜR INVESTITIONS-FÖRDERUNG UND STADTENTWICKLUNG GMBH, UND DEM BUND BMU BUNDESMINISTERIUM FÜR UMWELT, NATURSCHUTZ UND REAKTORSICHERHEIT BMBF BUNDESMINISTERIUM FÜR BILDUNG UND FORSCHUNG MIT EINER KOFINANZIERUNG AUS MITTELN DES EUROPÄISCHEN FONDS FÜR REGIONALE ENTWICKLUNG (EFRE) GEFÖRDERT.

16 Vielen Dank für Ihre Aufmerksamkeit!