箱型桥梁结构的面板声学贡献分析

发布时间：2018-02-25 22:20

本文关键词： 箱型梁结构噪声声辐射面板声学贡献分析　出处：《铁道科学与工程学报》2015年04期 　论文类型：期刊论文

【摘要】：以高速铁路32 m混凝土简支箱型桥梁为研究对象,通过有限元软件建立了轨道-桥梁分析模型,采用车辆-轨道-桥梁耦合振动理论,分析了桥梁结构的竖向振动,并将得到的竖向振动响应作为边界条件,导入到箱梁边界元模型中预测箱梁结构噪声。同时基于面板声学贡献分析理论,进行了箱梁梁体的面板声压贡献分析和声功率贡献分析,确定箱梁梁体辐射噪声的最大部位。研究结果表明:列车以200 km/h的速度运行在高架轨道上时,箱梁梁体辐射噪声主要集中0-100 Hz范围内,其中在20 Hz和42 Hz左右有比较突出峰值。同时由面板声学贡献分析可知箱梁梁体主要辐射噪声的部位是箱梁的顶板和两侧翼缘板下面板。
[Abstract]:Taking the 32 m concrete simply supported box bridge of high-speed railway as the research object, the track bridge analysis model is established by the finite element software, and the vertical vibration of the bridge structure is analyzed by using the vehicle-track bridge coupling vibration theory. The vertical vibration response is used as the boundary condition to predict the structural noise of the box girder, and based on the theory of panel acoustic contribution, the vertical vibration response is introduced into the box girder boundary element model to predict the structural noise of the box girder. The acoustic pressure contribution analysis and acoustic power contribution analysis of the box girder body are carried out to determine the maximum position of the radiated noise of the box girder body. The results show that when the train is running on the elevated track at the speed of 200 km/h, The radiation noise of box girder is mainly concentrated in the range of 0-100 Hz. Among them, there are prominent peaks at about 20 Hz and 42 Hz, and the acoustic contribution of the panel shows that the main part of the radiated noise of the box girder is the top plate of the box girder and the bottom panel of the flange plate on both sides.
【作者单位】：华东交通大学铁路环境振动与噪声教育部工程研究中心;同济大学道路与交通工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51268014) 江西省高等学校科技落地计划项目(12024)
【分类号】：U441.3

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