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Magnetic Flux Leakage Method based Local Fault Detection for Inspection of Wire Rope

승강기 와이어로프 진단을 위한 누설자속기법 기반 국부손상 진단

Kim Ju-Won
,
Park Ju-Young
,
Park Seunghee†*
Department of Convergence Engineering for Future City
Department of Civil & Environmental System Engineering
School of Architectural, Civil & Environmental Engineering

• 본 논문에 대한 토의를 2015년 8월 30일까지 학회로 보내주시면 2015년 10월호에 토론결과를 게재하겠습니다.

*Corresponding Author : shparkpc@skku.edu
2015. pp. 417-423
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Abstract

본 연구에서는 와이어로프의 국부손상 검색을 위해 누설자속기법을 적용하였다. 와이어로프 구조물에 적용하기 위해 리프트오프의 발생을 최소화한 4채널 누설자속 센서헤드를 제작하였고, 이를 사용하여 와이어로프의 국부손상 검색실험을 수행하였다. 국부손상 검색실험을 위해 와이어로프를 준비하였고, 다양한 원주방향을 가지는 부분 단선 손상들을 발생시켰다. 제작된 자속누설 센서헤드를 이용하여 와이어로프 시편의 자속신호를 스캔하였고, 노이즈의 영향을 최소화하고 자속신호의 해상도를 향상시키고자 자속 신호를 미분하여 순간변화량을 손상 검색에 활용하였다. 객관적인 손상 판단을 위해 각 채널에서 계측된 자속신호를 GEV분포를 이용해 설정된 임계값과 비교하였다. 최종적으로 임계값을 초과한 부분의 길이방향 및 원주방향 위치를 실제 손상과 비교함으로써 본 기법의 국부손상 검색 가능성을 살펴보았다.

In this study, Magnetic Flux Leakage(MFL)-based inspection system was applied to detect the local fault of wire rope. To verify the feasibility of the proposed damage detection technique, an 4-channel MFL sensor head prototype was designed and fabricated. A wire rope with several types of cross-sectional damages were fabricated and scanned by the MFL sensor head to measure the magnetic flux density of the wire rope specimen. To interpret the condition of the wire rope, magnetic flux signals were used to determine the locations of the flaws. To improve the resolution of signal, the instantaneous variation value of magnetic flux was utilized. Measured signals from the damaged specimen were compared with thresholds set for objective decision making. Finally, the results were compared with information on actual inflicted damages to confirm the accuracy and effectiveness of the proposed cable monitoring method.

키워드
누설자속기법, 국부단면손상, 와이어로프, GEV분포, 자속의 순간변화량
magnetic flux leakage, local fault, wire rope, GEV distribution, instantaneous variation
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 28
  • No :4
  • Pages :417-423
  • Received Date : 2015-07-07
  • Revised Date : 2015-07-19
  • Accepted Date : 2015-07-20
  • DOI :https://doi.org/10.7734/COSEIK.2015.28.4.417
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