淡江大學機構典藏:Item 987654321/117151
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    题名: Noise-radiation analysis of box-shaped rail bridges considering multi-span effects
    作者: L Y Liu;S Y Peng;J D Yau;Q M Liu;R Xi
    关键词: Acoustical Boundary Element Method;Box Girder;Finite Element Modeling;Panel Acoustic Contribution Analysis;Structure-borne Noise
    日期: 2019-09
    上传时间: 2019-09-27 12:10:18 (UTC+8)
    出版者: 淡江理工學院
    摘要: Low-frequency structure-borne noise radiation from train-induced vibration of railway bridges is of concern to assess environmental impacts induced by urban metro system. To carry out the bridge-radiated noise analysis in assessing environmental impacts, the bridge vibration is regarded as an acoustic source of noise radiation so that the finite element (FE) bridge model combined with the acoustic boundary element (BE) method of spatial noise radiation is adopted in performing acoustical computations. For verification, an in-situ experimental noise measurement of rail box-shaped bridge on the selected metro line of Nanchang Metro is used to evaluate the feasibility of the present hybrid FE-BE approach. In addition, the method of panel acoustic contribution analysis is proposed to assess the noise levels radiated from a single/multi-span box-shaped bridges, respectively. With the present investigations, the multi-span bridges may result in larger structure-borne radiated sound pressure levels at far-fields than a single-span. Such a multi-span effect on bridge-radiated noise should be accounted for environmental noise evaluation along urban metro lines.
    關聯: Journal of Applied Science and Engineering 22(3), p.469-479
    DOI: 10.6180/jase.201909_22(3).0008
    显示于类别:[建築學系暨研究所] 期刊論文

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