A high speed train-track coupling dynamics model was established using Simpack software, and the wheel/rail vertical contact force excited by track irregularity spectrum was calculated. The wheel/rail vertical force was taken as a boundary condition and applied to the finite element model (FEM) of an elevated box girder structure to calculate its surface vibration response. Then, the vibration response was taken as the acoustic boundary conditions and was applied to the bound-ary element model (BEM) of the elevated box-girder structure to analyze its sound radiation. The results show that, using the finite element method and the boundary element method, the vibration noise of the concrete simply-supported box-beam structure can be effectively calculated with shell elements. The vibration noise is mainly concentrated in the low frequency range of 0-200 Hz, and the peaks mainly appear at the central frequencies of 16 Hz, 25 Hz, 80 Hz-100 Hz. The sound pres-sure level decreases with the increase of the distance from the ground in the lateral sound field and this tendency is more ob-vious for lower frequency sound field. The sound pressure level generally increases with the increase of the distance from the ground in the vertical acoustic field, and the sound pressure level in far field area does not change obviously for the fre-quencies below 31.5 Hz. In the range of 80 Hz-100 Hz, the sound pressure levels of the field points near the girder, especial-ly above the girder, are higher than those in the other regions.%利用Simpack软件建立高速列车-轨道耦合动力学模型，计算在轨道不平顺谱激励下的轮轨垂向力，以此作为载荷边界条件施加到高架箱梁结构的有限元模型。计算了高架箱梁表面的振动响应，并利用箱梁结构振动响应作为声学边界条件。进而又采用间接边界元法对其进行声辐射分析。研究结果表明，利用板壳单元，采用有限元—边界元方法能够有效计算混凝土简支箱梁结构的振动噪声，主要集中在0～200 Hz的低频段，峰值主要出现在中心频率16 Hz、25 Hz与80 Hz～100 Hz；横向声场的声压级随着距离的增加而减小，频率越低越明显；垂向声场的声压级整体上随离地面距离的增加而增大，其中远场区域的声压级在低于31.5 Hz的频段内变化不大，在80 Hz～100 Hz频段内箱梁结构对其附近及上方区域的结构噪声大于其它区域，尤其是箱梁正上方。
展开▼
