변형률 센서를 이용한 구조물의 동적 모니터링

Dynamic monitoring of structures using strain sensors

  • 최성훈 (한국철도기술연구원, 차세대고속철도사업단) ;
  • 은종필 (한국철도기술연구원, 차세대고속철도사업단) ;
  • 강동훈 (한국철도기술연구원, 철도산업지원실)
  • 발행 : 2009.05.21

초록

Measurement of dynamic characteristics are widely used to detect defects in mechanical or civil structures. The most common approach is to measure changes in frequency spectrum or mode shapes using accelerometers. An alternative to using mode shapes is using stain modes. Strain is more sensitive to local defects than displacement, and hence stain modes measurement is an efficient in structural health monitoring. This paper deals with dynamic monitoring of a beam structure using strain sensors. Resistive strain gages and FBG strain gages are used and their characteristics are compared. It has been known that resistive strain gages are week to EMI environment and suffers from noise at high frequency range. It has been shown that the FBG sensor is a good alternative that overcomes such difficulties.

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