【摘要】 列车在高架铁路运行时辐射的噪声与路基线路存在较大差异,特别是当线路采用了声屏障后,高架结构辐射的噪声对沿线环境的影响将显现.文中应用动力学基本理论建立了车-桥线路的耦合模型,获得了列车运行时轮轨之间的作用力,将其作为高架结构的统计能量分析的输入,研究了高架结构振动与声辐射,并应用高架结构的振动测试,进行了模型验证.应用该模型研究了200km/h速度下列车运行引起的高架结构噪声辐射,分析了轨道垫板的刚度变化对高架结构声辐射的影响,得出了优化轨道垫板的刚度可以提高高架结构声屏障的总体降噪效果的结论.更多还原

【Abstract】 Elevated railway is an important form of the railway line,noise of the train running in the overhead railway differs from that running in the roadbed line.Especially when the sound barrier is used on the line,impact of the noise radiated from elevated structure on the environment along the line will appear obviously.This paper has established a train-bridge line coupling model with application of the basic theory of dynamics at first,and obtained the force between wheels and rail during the train running;Through taking that as the input of SEA on viaduct structure,the vibration and acoustic radiation of viaduct structure is researched.The model has been validated with application of viaduct structure by vibration analysis and testing.The relationship between parameters,like noise radiation of viaduct structure and stiffness of elasticity bolster,is also studied.The conclusion drawn indicates that changing stiffness of elasticity bolster can improve noise reduction of the sound barrier for the viaduct structure,and it is feasible to predict noise for viaduct structure of railway with theory of dynamics and SEA.更多还原