대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제28권10호
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  • Pages.1467-1474
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  • 2004
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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외팔보에 대한 가진력수준제어를 통한 피로균열규명기법의 실험적 검증

Experimental Verifications of Fatigue Crack Identification Method Using Excitation Force Level Control for a Cantilever Beam

  • 김도균 (한국과학기술원 기계공학과) ;
  • 이순복 (한국과학기술원 기계공학과)
  • 발행 : 2004.10.01
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초록

In this study, a new damage identification method for beam-like structures with a fatigue crack is proposed. which does not require comparative measurement on an intact structure but require several measurements at different level of excitation forces on the cracked structure. The idea comes from the fact that dynamic behavior of a structure with a fatigue crack changes with the level of the excitation force. The 2$^{nd}$ spatial derivatives of frequency response functions along the longitudinal direction of a beam are used as the sensitive indicator of crack existence. Then, weighting function is employed in the averaging process in frequency domain to account for the modal participation of the differences between the dynamic behavior of a beam with a fatigue crack at the low excitation and one at the high excitation. Subsequently, a damage index is defined such that the location and level of the crack may be identified. It is shown from the analysis of vibration measurements in this study that comparison of frequency response characteristics of a beam with a single fatigue crack at different level of excitation forces enables an effective detection of the crack.

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참고문헌

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