• Title/Summary/Keyword: 국부 진동

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Vibration Localization of Open Loop Repeated Structures (개방형 반복구조물의 진동국부화)

  • Ha, Dong-Jin;Yoo, Hong-Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.12
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    • pp.911-917
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    • 2003

  • Vibration localization characteristics of open loop repeated mistuned structures are investigated. The mistuning often creates significant response discrepancies among subcomponents of the repeated structures. As a result of the discrepancies, critical fatigue problems often occur in repeated structures. Therefore. it is of great importance to predict the vibration response of the mistuned repeated structures accurately in this Paper, a simplified model for an open-loop repeated structure is introduced and dimensionless parameters that influence the localization characteristics are identified. The effects of the parameters on the localization characteristics are investigated through numerical study.

  • https://doi.org/10.5050/KSNVN.2003.13.12.911 인용 PDF KSCI

Vibration Localization due to Mistuned Coupling Effects Among Repeated Structures (반복 구조간 연성 효과의 불균일성에 의한 진동 국부화)

  • Kang, Min-Kyoo;Yoo, Hong-Hee
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.12 no.12
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    • pp.994-1000
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    • 2002

  • In periodically repeated cyclic structures, small property irregularity of their substructures often causes significant difference in their dynamic responses. which results in unpredicted premature failures. The small irregularity and the resulting phenomenon are called the mistuning and the vibration localization. respectively. In this paper, the vibration localization phenomena due to mistuned coupling effects are investigated. To effectively achieve the objective, a simple coupled multi-pendulum system Is employed. The results show that if there exists some coupling stiffness irregularity, vibration localization may occur and becomes more predominant as the number of substructures increases.

  • https://doi.org/10.5050/KSNVN.2002.12.12.994 인용 PDF KSCI

Experimental Investigation on the Flapping Motions of Horizontal Merging Buoyant Jet Discharged into Stationary Ambient Water (정체수역으로 방류된 수평병합부력제트의 진동운동에 대한 실험적 연구)

  • Lyu, Si-Wan;Seo, Il-Won
    • Journal of Korea Water Resources Association
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    • v.38 no.8 s.157
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    • pp.691-698
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    • 2005

  • A series of experiments has been performed to investigate the flapping motion, which has been generally considered as an intrinsic characteristic of plane flow, of the horizontal merging buoyant jet discharged into stationary ambient water. For Horizontal merging buoyant jets, the flapping motions has been observed and the average onsets of flapping motion coincided with the start of merging transition. The Strouhal number, which describes the measure of frequency of vortices on the flow boundary with respect to the local properties of the flow, varies and converges to a constant value over merging transition. Considering the merging transition and the variation of local flow properties, the characteristics of flapping motion of plane flow can be applied to merging buoyant jets.

  • https://doi.org/10.3741/JKWRA.2005.38.8.691 인용 PDF KSCI