Smart Structures and Systems

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Development of wireless SHM sensor node for in-flight real-time monitoring using embedded CNT fiber sensors

  • Park, Jinwoo (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Sung, Yeol-Hun (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • On, Seung Yoon (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kwon, O-Hyun (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Bang, Hyochoong (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Seong Su (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Han, Jae-Hung (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 : 2020.07.02
  • Accepted : 2021.03.22
  • Published : 2021.09.25
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Abstract

Structural health monitoring (SHM) is essential for composite unmanned aerial vehicles (UAVs). Additionally, because UAVs are extremely sensitive to weight and volume, the minimal addition of weight and volume by the SHM system is crucial. Therefore, we proposed a compact and lightweight wireless SHM sensor node and an embedded carbon nanotube (CNT) fiber sensor for in-flight SHM of UAVs. The wireless SHM sensor node was composed of an analog sensing circuit, wireless microcontroller unit, and analog low pass filter. The small diameter CNT fiber sensor was developed to be easily embedded inside composite structures and to enhance their structural properties while performing as an SHM sensor. Glass composite skin with embedded CNT fiber sensors composed of ultra-high-molecular-weight polyethylene, polyurethane, CNT, and carbon black were installed in the aircraft. For comparison, a strain gauge attached at the center of a long CNT fiber sensor was also used during in-flight measurement. In-flight strain measurements from both the CNT fiber sensor and the strain gauge were continuously transmitted to the ground station and were compared with the flight data. Furthermore, an impact tester was installed inside the wing to simulate impact during flight, and in-flight impact measurements by the CNT fiber sensor were demonstrated.

Keywords

Acknowledgement

This work was supported by the Technology Innovation Program (10074278) funded by the Ministry of Trade, Industry & Energy (MI, Korea) and by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (NRF-2017R1A5A1015311).

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