Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Development of a PVDF sensor for detecting over-load and impact on large-scale mechanical structures

대형 기계 구조물의 과부하 및 충격 측정을 위한 PVDF 센서 개발

  • Kang, Dong-Bae (School of Mechanical Engineering, Pusan National University) ;
  • Ahn, Jung-Hwan (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Gang-Yeon (School of Mechanical Engineering, Ulsan College) ;
  • Son, Seong-Min (School of Mechanical Engineering, Ulsan College)
  • 강동배 (부산대학교 기계공학부) ;
  • 안중환 (부산대학교 기계공학부) ;
  • 김강연 (울산과학대학교 기계공학부) ;
  • 손성민 (울산과학대학교 기계공학부)
  • Received : 2013.10.08
  • Accepted : 2014.11.06
  • Published : 2014.11.30
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Abstract

An external overload or impact is an important factor affecting the safety of large-scale structures. The proposal of this paper is the development of a system for detecting overload and impulse using a single PVDF film sensor. In large-scale structures, the load causes the structure to be deformed and the impulse generates vibration on the structure. Generally, low frequency deformation or bending of a structure is measured with a strain gauge and the high frequency vibration is detected by an accelerometer. On the other hand, a single sensor that can detect both deformation and vibration has not been developed. In this study, the development of a detection system integrated with a polyvinylidene fluoride (PVDF) film sensor, amplifier, and software was attempted to monitor deformation and impact through a single sensor. The system was verified by the possibility of detecting overload and impulse, and the two filtered signals of the PVDF were compared with a conventional strain gauge and an accelerometer.

오늘날 작업능률 및 운용효율의 향상을 위해 장비의 대형화 추세가 진행되고 있으나 이와 더불어 사고 발생 시에는 많은 인명 피해와 함께 크나큰 경제적인 손실을 초래하게 되어 대형장비의 안전성 문제에 대하여 많은 연구가 진행되고 있다. 대형구조물의 안전성 감시를 위해 외부의 부하에 따른 구조물의 변형은 스트레인게이지로, 순간적인 충격에 의한 진동은 가속도 센서를 이용한다. 본 연구에서는 고분자 압전 필름센서인 PVDF(PolyVinyliDene Fluoride)를 이용하여 구조물의 변형에 대한 측정뿐만 아니라 충격에 대해서도 민감하게 반응하여 하나의 센서로 부하와 충격을 모두 검출하여 산업적 효율성과 실효성 향상을 도모하였다. 개발된 센서는 스트레인 게이지의 출력값에 대해 14% 이내의 오차를 나타내고 가속도 센서와는 충격에 대해 동일한 패턴의 충격신호를 나타내었다.

Keywords

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