A Study on Applicability of Wireless Impedance Sensor Nodes Technique for Tensile Force Monitoring of Structural Cables

구조용 케이블의 인장력 모니터링을 위한 무선 임피던스 센서노드 기술의 적용성에 관한 연구

  • Received : 2009.12.16
  • Accepted : 2010.02.10
  • Published : 2010.02.27

Abstract

In this study, a technique that uses wireless impedance sensor nodes is proposed to monitor tensile force of structural cable. To achieve this goal, the following approaches were implemented. First, a wireless impedance sensor node was designed for automated and cost-efficient prestress-loss monitoring. Second, an impedance-based algorithm was embedded in the wireless impedance sensor node for autonomous structural health monitoring of structural cables. Third, a tensile force monitoring technique that uses an interface plate for structural cables was proposed to overcome the limitations of the wireless impedance sensor node such as its narrow-band measurable frequency ranges. Finally, the applicability of the wireless impedance sensor node and the technique that uses the interface washer were evaluated in a lab-scaled prestressed concrete (PSC) girder model with internal and external tendons for which several prestress-loss scenarios were experimentally monitored with the wireless impedance sensor nodes.

본 연구에서는 구조 케이블의 인장력 모니터링을 위한 무선 임피던스 센서노드를 개발하였다. 이를 위해 다음과 같은 연구가 수행되었다. 첫째, 경제적이고 자동화된 구조 케이블의 인장력 모니터링을 위한 무선임피던스 센서노드를 설계/제작 하였다. 둘째, 자동화된 인장력 모니터링을 위해 임피던스 기반 모니터링 기법을 무선 센서노드에 내장하였다. 셋째, 측정 범위가 제한적인 무선임피던스 센서노드의 한계점을 극복하기 위하여 인터페이스 와셔를 이용하는 구조케이블 인장력 모니터링 기법을 제안하였다. 마지막으로 내장형/외장형 텐던을 가지는 모형 프리스트레스트 콘크리트 거더에 대하여 무선임피던스 센서노드와 인터페이스 와셔를 이용하는 모니터링 기법의 적용성을 평가하였다.

Keywords

References

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