关于轨道交通声屏障结构优化的仿真分析

Simulation analysis of optimizing the structure of the noise barrier for railway traffic

采用有限元—无限元耦合法,依据有关文献的声屏障模型进行有限元建模,验证基于有限元—无限元耦合法的Actran软件计算声屏障插入损失。在通过试验验证无声屏障时路基线路模型可靠性的基础上,进而对表面带有凸起的声屏障结构进行数值仿真计算分析;研究表面带有圆形凸起和表面带有三角形凸起的声屏障结构的扩散体宽度、间距及突出高度分别对其降噪效果的影响,并优化其各自结构参数,为设计效果达标、结构合理和外形美观的声屏障提供理论依据。

The combination of finite element and infinite element method was utilized to establish the simulation model in this paper according to the sound barrier model in relevant references so as to prove the feasibility and reliability of using Actran software to calculate the insertion loss. For further study on the sound barrier type of surface with different convex,the numerical analysis was conducted and the reliability of the sub grade model without noise barrier was verified by the experimental test to analyze the influence of body width,separation distance and height of diffusers on the sound reduction effect. And then the structural parameters of the sound barrier were optimized in order to provide theoretical foundation for standard design,reasonable structure and aesthetic appearance of the sound barriers.