Advanced Shipping and Ocean Engineering                    
Advanced Shipping and Ocean Engineering(ASOE)
ISSN:2306-7675(Print)
ISSN:2306-7667(Online)
Frequency: Quarterly
Website: www.academicpub.org/asoe/
Structural Health Monitoring Data Transmission for Composite Hydrokinetic Turbine Blades
Full Paper(PDF, 389KB)
Abstract:
A health monitoring approach is investigated for hydrokinetic turbine blades. In-service monitoring is critical due to the difficult environment for blade inspection and the cost of inspection downtime. Composite blade designs provide a medium for embedding sensors into the blades for in-situ health monitoring. The major challenge with in-situ health monitoring is transmission of sensor signals from the remote rotating reference frame of the blade to the system monitoring station. In the presented work, a novel system for relaying in-situ blade health measurements in hydrokinetic systems is described and demonstrated. An ultrasonic communication system is used to transmit sensor data underwater from the rotating frame of the blade to a fixed relay station. Data are then broadcast via radio waves to a remote monitoring station. Results indicate that the assembled system can transmit simulated sensor data with an accuracy of ±5% at a maximum sampling rate of 500 samples/sec. A power investigation of the transmitter within the blade shows that continuous max-sampling operation is only possible for short durations (~days), and is limited due to the capacity of the battery power source. However, intermittent sampling, with long periods between samples, allows for the system to last for very long durations (~years). Finally, because the data transmission system can operate at a high sampling rate for short durations or at a lower sampling rate/higher duty cycle for long durations, it is well-suited for short-term prototype and environmental testing, as well as long-term commercially-deployed hydrokinetic machines.
Keywords:Marine Energy; Hydrokinetic Energy; Structural Health Monitoring; Acoustic Communication
Author: A. Heckman1, J. L. Rovey1, K. Chandrashekhara1, S. E. Watkins2, D. S. Stutts1, A. Banerjee3, R. S. Mishra4
1.Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, Missouri, 65409, USA
2.Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, Missouri, 65409, USA
3.Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pennsylvania,18015 USA
4.Materials Science and Engineering, University of North Texas, Denton, Texas, 76203, USA
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