한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제19권9호
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  • Pages.935-942
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  • 2009
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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진동특성을 이용한 외팔보의 크랙 및 손상 검출에 대한 연구

Study on Detection of Crack and Damage for Cantilever Beams Using Vibration Characteristics

  • 발행 : 2009.09.20
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초록

In this paper, the purpose is to investigate the natural frequency of a cracked Timoshenko cantilever beams by FEM(finite element method) and experiment. In addition, a method for detection of crack in a cantilever beams is presented based on natural frequency measurements. The governing differential equations of a Timoshenko beam are derived via Hamilton's principle. The two coupled governing differential equations are reduced to one fourth order ordinary differential equation in terms of the flexural displacement. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. The detection method of a crack location in a beam based on the frequency measurements is extended here to Timoshenko beams, taking the effects of both the shear deformation and the rotational inertia into account. The differences between the actual and predicted crack positions and sizes are less than 6 % and 23 % respectively.

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참고문헌

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피인용 문헌

  1. Multi-crack Detection of Beam Using the Change of Dynamic Characteristics vol.25, pp.11, 2015, https://doi.org/10.5050/KSNVE.2015.25.11.731