轨道交通双箱单室箱型梁结构改进后减振降噪效果分析

针对轨道交通高架桥结构振动噪声问题,将有限元振动分析理论与声辐射分析边界元法相结合,分析双箱单室箱型梁低频噪声辐射特性。通过改变腹板与轨道的相对位置,对比分析双箱单室箱型梁结构改进后的减振降噪效应。计算结果表明:双箱单室箱型梁改变腹板与轨道相对位置后,底板和腹板减振效果明显;场点的峰值声压也出现不同程度的降低,说明将腹板置于轨下的改进措施对双箱单室箱型梁减振降噪是有效的。

Analysis of the Vibration and Noise Reduction Effect after the Structural Improvement for Rail Transit Twin-box Single-cell Girder

For the serious problem of noise caused by rail transit viaduct structure,finite element method (FEM) and boundary element method (BEM) are used to analyze the low frequency noise radiation characteristics cause by twin-box sin-gle-cell girder. Through changing the relative position of webs and tracks,noise reduction effect is analyzed by improving the twin-box single-cell box girder structure. The calculation re-sults indicate that the vibration reduction effect of the base baseboard and web plate is obvious after the relative position changing of webs and tracks,and the peak sound pressure of sites has also been reduced at varying degrees. It is clear that the method of putting web under the rail is effective to reduce the vibration and noise of double-box single-cell girder.