Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Liquid Metal Strain Gauge for Measuring WT Blade's Deformation

풍력발전기 블레이드 변형 측정을 위한 액체금속 스트레인 게이지 개발

  • Park, In Kyum (Department of Mechanical and Mechatronics Engineering, Kangwon National University) ;
  • Seo, Youngho (Department of Mechanical and Mechatronics Engineering, Kangwon National University) ;
  • Kim, Byeong Hee (Department of Mechanical and Mechatronics Engineering, Kangwon National University)
  • 박인겸 (강원대학교 기계메카트로닉스공학과) ;
  • 서영호 (강원대학교 기계메카트로닉스공학과) ;
  • 김병희 (강원대학교 기계메카트로닉스공학과)
  • Received : 2014.06.17
  • Accepted : 2015.02.13
  • Published : 2015.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, the embedding type novel liquid metal strain gauge was developed for measuring the deformation of wind turbine blades. In general, the conventional methods for the SHM have many disadvantages such as frequency distortion in FBG sensors, the low gauge factor and mechanical failures in strain gauges and extremely sophisticated filtering in AE sensors. However, the liquid metal filled in a pre-confined micro channel shows dramatic characteristics such as high sensitivity, flexibility and robustnes! s to environment. To adopt such a high feasibility of the liquid metal in flexible sensor applications, the EGaIn was introduced to make flexible liquid metal strain gauges for the SHM. A micro channeled flexible film fabricated by the several MEMS processes and the PDMS replication was filled with EGaIn and wire-connected. Lots of experiments were conducted to investigate the performance of the developed strain gauges and verify the feasibility to the actual wind turbine blades health monitoring.

Keywords

References

  1. Yang, B. and Sun, D., "Testing, Inspecting and Monitoring Technologies for Wind Turbine Blades: A Survey," Renewable and Sustainable Energy Reviews, Vol. 22, pp. 515-526, 2013. https://doi.org/10.1016/j.rser.2012.12.056
  2. Kim, K., Lee, J. M., and Hwang, Y., "Determination of Engineering Strain Distribution in a Rotor Blade with Fibre Bragg Grating Array and a Rotary Optic Coupler," Optics and Lasers in Engineering, Vol. 46, No. 10, pp. 758-762, 2008. https://doi.org/10.1016/j.optlaseng.2008.04.022
  3. Kim, S. W., Kim, E. H., Rim, M. S., Shrestha, P., and Lee, I., "Structural Performance Tests of Down Scaled Composite Wind Turbine Blade using Embedded Fiber Bragg Grating Sensors," International Journal of Aeronautical & Space Science, Vol. 12, No. 4, pp. 346-53, 2011. https://doi.org/10.5139/IJASS.2011.12.4.346
  4. Bang, H.-J., Kim, H.-I., and Lee, K.-S., "Measurement of Strain and Bending Deflection of a Wind Turbine Tower using Arrayed FBG Sensors," Int. J. Precis. Eng. Manuf., Vol. 13, No. 12, pp. 2121-2126, 2012. https://doi.org/10.1007/s12541-012-0281-2
  5. Schubel, P., Crossley, R., Boateng, E., and Hutchinson, J., "Review of Structural Health and Cure Monitoring Techniques for Large Wind Turbine Blades," Renewable Energy, Vol. 51, pp. 113-123, 2013. https://doi.org/10.1016/j.renene.2012.08.072
  6. Blanch, M. J. and Dutton, A. G., "Acoustic Emission Monitoring of Field Tests of an Operating Wind Turbine," in Damage Assessment of Structures V, Dulieu-Barton, J. M., Brennan, M. J., Holford, K. M., and Worden, K.(Eds.), Key Engineering Materials, Vols. 245-246, pp. 475-482, 2003.
  7. Rumsey, M. A. and Musial, W., "Application of Acoustic Emission Nondestructive Testing during Wind Turbine Blade Tests," Journal of Solar Energy Engineering, Vol. 123, No. 4, pp. 270-270, 2001. https://doi.org/10.1115/1.1409559
  8. Mohammed, M. G. and Dickey, M. D., "Strain- Controlled Diffraction of Light from Stretchable Liquid Metal Micro-Components," Sensors and Actuators A: Physical, Vol. 193, pp. 246-250, 2013. https://doi.org/10.1016/j.sna.2013.01.031
  9. Okamura, A. M. and Cutkosky, M. R., "Feature Detection for Haptic Exploration with Robotic Fingers," International Journal of Robotics Research, Vol. 20, No. 12, pp. 925-938, 2001. https://doi.org/10.1177/02783640122068191
  10. Tajima, R., Kagami, S., Inaba, M., and Inoue, H., "Development of Soft and Distributed Tactile Sensors and the Application to a Humanoid Robot," Advanced Robotics, Vol. 16, No. 4, pp. 381-397, 2002. https://doi.org/10.1163/15685530260174548
  11. Yang, L., Martin, L. J., Staiculescu, D., Wong, C., and Tentzeris, M. M., "Conformal Magnetic Composite RFID for Wearable RF and Bio-Monitoring Applications," IEEE Transactions on Microwave Theory and Techniques, Vol. 56, No. 12, pp. 3223- 3230, 2008. https://doi.org/10.1109/TMTT.2008.2006810
  12. Hayes, G. J., So, J.-H., Qusba, A., Dickey, M. D., and Lazzi, G., "Flexible Liquid Metal Alloy (egain) Microstrip Patch Antenna," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 5, pp. 2151- 2156, 2012. https://doi.org/10.1109/TAP.2012.2189698
  13. Dickey, M. D., Chiechi, R. C., Larsen, R. J., Weiss, E. J., Weitz, D. A., and Whitesides, G. M., "Eutectic Gallium-Indium (EGaIn): A Liquid Metal Alloy for the Formation of Stable Structures in Microchannels at Room Temperature," Advanced Functional Materials, Vol. 18, No. 7, pp. 1097-1104, 2008. https://doi.org/10.1002/adfm.200701216
  14. Daily, J. W. and Riley, W. F., "Hand-book on Experimental Mechanics," Prentice-Hall Englewood Cliffs, pp. 41-78, 1987.

Cited by

  1. Manufacturing Method for Sensor-Structure Integrated Composite Structure vol.28, pp.4, 2015, https://doi.org/10.7234/composres.2015.28.4.155