1. Structural Monitoring System for Offshore Wind Turbine Foundation Structures ewec 2006, Athens 28 February J. Wernicke, S. Kuhnt, R. Byars, J. Shadden (WindForce GmbH)

2. The Idea of WAVEMON™ Knowledge of Foundation Load History of individual Offshore Wind Turbines throughout Lifetime for: Predictive Maintenance Residual Lifetime Estimation Design Verification Load Reduction

3. Targets Measuring of Height, Direction and Frequency of Ocean Waves Measuring of Wind- and Tide Currents Traceability of single Events (extreme Loads, Ship Collisions, etc.) Traceability of fatigue Loads for residual Lifetime Estimation Monitoring of Design Parameters Decreasing of Wave Loads via Turbine Control Monitoring of the Foundation Structure for early Detection of Damages and for determining predictive Maintenance Demonstration of Insurability of Foundation Structures WAVEMON™ Offshore Wind Turbine Foundation Control WAVEMON Technology

4. Fibre optical sensors (FOS) – Advantages towards Strain Gauges Number of Sensors per Array –Simple Installation, small Sensor Mass Increased operational safety –No electrical Conductivity in the Sensor System No EMI Problems with Data Acquisition –no Corrosion High Quality of Measurement and long term Stability –No moving Parts in Evaluation System –Lifetime >20 years –Simple Field Installation –Simple Calibration in Field –No Movement of zero Point –No Hysteresis

5. Complete Solution: WAVEMON™ - Offshore Wind Turbine Foundation Control

6. Performance Structural Monitoring Condition Monitoring of the Monopile and its Support Conditions. Single Events can be documented and the Relevance towards Failure can be estimated. Adaptive Control Damping of Wave Loads. Predictive Maintenance Service Activities based on Event logging and Data Evaluation Residual Lifetime Estimation Comparison of individual Load History during Operation with Design Load Simulations

7. Project plan Installation and testing of the Measurement System in a Monopile of a Wind Met Mast Analysis of Load Data and dynamic Behaviour, Comparison with Simulation Development of Methods for controlling and operating, based on Variables Development of Methods for assuring the Application Process in serial Production in Offshore Installations

8. WAVEMON™ Development trend Integration in Remote Monitoring Standard for Performance Supervision and Design Verification Development of a Wind Park Management System based on Load Data Structural monitoring of Concrete Towers

9. Example of a WAVEMON™ Field Application

10. Location of the Met Mast

11. Array Positions

12. Pictures of the Prototype Installation

13. Met Mast

14. Measurement Results

15. Frequency Analysis

16. www.wind-force.com jens.wernicke@wind-force.com Die Entwicklung wird teilweise finanziert durch Mittel aus dem PFAU Programm der BIS Bremerhaven WindForce GmbH wird unterstützt durch Mittel des GRW Programms des Landes Bremen Thank you for your Attention!