외팔보에 대한 가진력수준제어를 통한 피로균열규명기법의 실험적 검증Experimental Verifications of Fatigue Crack Identification Method Using Excitation Force Level Control for a Cantilever Beam

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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.
Publisher
대한기계학회
Issue Date
2004-10
Language
Korean
Citation

대한기계학회논문집 A, v.28, no.10, pp.1467 - 1474

ISSN
1226-4873
URI
http://hdl.handle.net/10203/84306
Appears in Collection
ME-Journal Papers(저널논문)
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