Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Acoustic Emission Training Technique and Localization Method using Q-switched Laser and Multiple Sensors/Single Channel Acquisition

Q-switched 레이저와 다중센서/단일채널 신호수집을 이용한 복합재 구조 음향방출 트레이닝 및 위치탐지 기법 개발

  • Choi, Yunshil (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Jung-Ryul (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2018.05.21
  • Accepted : 2018.07.18
  • Published : 2018.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

Various structural health monitoring (SHM) systems have been suggested for aerospace industry in order to increase its life-cycle and economic efficiency. In the case of aircraft structure madden with metal, a major concern was hot spots, such as notches, bolts holes, and where corrosion or stress concentration occurs due to moisture or salinity. However, with the increasing use of composites in the aerospace industry, further advanced SHM systems have been being required to be applied to composite structures, which have much complex damage mechanism. In this paper, a method of acoustic emission localization for composite structures using Q-switched laser and multiple Amplifier-integrated PZTs have been proposed. The presented technique aims at localization of the AE with an error in distance of less than 10 mm. Acoustic emission simulation and the localization attempt were conducted in the composite structure to validate the suggested method. Localization results, which are coordinates of detected regions, grid plots and color intensity map have been presented together to show reliability of the method.

항공우주산업에서 구조물의 수명연장과 경제적 측면에서의 효율적인 운용을 위해 다양한 구조건전성모니터링(Structural Health Monitoring, SHM) 기법들이 제시되어왔다. 금속재 구조물의 경우, 수분이나 염분 등에 의한 부식이나 쉽게 응력집중이 발생하는 타공, 노치, 볼트 등과 같은 위치에서의 균열이 주된 관심사였으나, 항공우주산업에서의 복합재 사용비율이 증가함에 따라 손상 메커니즘이 더욱 복잡한 복합재 구조물에 적용이 가능한 고도화된 SHM 시스템의 필요성이 강조되고 있다. 본 논문에서는 Q-switched 레이저와 다수의 압전센서를 이용한 복합재에서의 AE(Acoustic emission) 위치탐지 기법을 제시한다. 제시되는 기법은 10 mm 이내의 거리오차로 방출위치 탐지를 목표로 하며 복합재 구조에서 수행된 AE 모사실험 및 위치탐지 시도 결과를 제시하여 기법이 유효함을 증명한다.

Keywords

References

  1. Jee, H.S., Lee, J.O., Ju, N.H., Lee J.K., and So, C.H., "Damage Evaluation for High Pressure Fuel Tank by Analysis of AE Paramemters," Composite Research, Vol. 24, No. 4, 2011, pp. 36-40. https://doi.org/10.7234/kscm.2011.24.4.036
  2. Farrar, C.R., and Worden, K., Structural Health Monitoring: A Machine Learning Perspective, Chichester, UK: Jonh Wiley and Sons Ltd., 2012.
  3. Park, C.Y., Jang, B.W., Kim, J.H., Kim, C.G., and Jun, S.M., "Bird Strike Monitoring in a Composite UAV Wing Using High Speed Optical Fiber Sensing System," Composites Science and Technology, Vol. 72, 2012, pp. 489-505. https://doi.org/10.1016/j.compscitech.2011.12.001
  4. Qiu, L., Yuan, S., Mei, H., and Qian, W., "Digital Sequences and a Time Reversal-Based Impact Region Imaging and Localization Method," Sensors, Vol. 13, 2013, pp. 13356-13381. https://doi.org/10.3390/s131013356
  5. Frieden, J., Cugnoni, J., Botsis, J., and Gmur, T., "Low Energy Impact Damage Monitoring of Composite Using Dynamic Strain Signals from FBG Sensors-Part I: Impact Detection and Localization," Composite Structures, Vol. 94, No. 2, 2012, pp. 438-445. https://doi.org/10.1016/j.compstruct.2011.08.003
  6. Kim, Y.Y., Kim, J.H., Park, Y., Shrestha, P., Kwon, H.J., and Kim, C.G., "Low-speed Impact Localization on Stiffened Composite Structure Using Reference Data Method," Composite Research, Vol. 29, No. 1, 2016, pp. 1-6. https://doi.org/10.7234/composres.2016.29.1.001
  7. Shrestha, P., Kim, J.H., Park, Y., and Kim, C.G., "Impact Localization on Composite Wing Using 1D Array FBG Sensor and RMS/correlation Based Reference Database Algorithm," Composite Structures, Vol. 125, 2015, pp. 159-169. https://doi.org/10.1016/j.compstruct.2015.01.029
  8. Jang, B.W., Park, S.O., Lee, Y.G., Kim, C.G., and C.Y. Park, "Detection of Impact Damage in Composite Structures Using High Speed FBG Interrogator," Advanced Composite Materials, vol. 21, No. 1, 2012, pp. 29-44.
  9. Bae, D.Y., and Lee, J.R., "Development of Single Channeled Serial-connected Piezoelectric Sensor Array and Damage Visualization Based on Multi-source Wave Propagation Imaging," Journal of Intelligent Material Systems and Structures, Vol. 27, No. 13, 2016, pp. 1861-1870. https://doi.org/10.1177/1045389X15615969
  10. Scruby, C., Wadley, H., Dewhurst, R., Hutchins, D., and Palmer, S., "A Laser-Generated Standard Acoustic Emission Source," Material Evaluation, Vol. Vol. 39, 1981, pp. 1250-1254.
  11. Lee, J.R., Jeong, H., Chung, T.T., Shin, H., and Park, J., "Damage Visualization of Filament Wound Composite Hydrogen Fuel Tank Using Ultrasonic Propagation Imager," Composite Research, Vol. Vol. 28, No. 4, 2015, pp. 143-147. https://doi.org/10.7234/composres.2015.28.4.143