复合工况下高速铁路声屏障的流固耦合研究

摘要

通过在流体模块Fluent中求解RNGk-ε两方程模型,得到高速铁路声屏障在列车风致脉动力和自然风荷载联合作用下的外流场分布,并将分析结果作为载荷通过耦合交界面传递给结构分析模块Structural(ANSYS),进行瞬态动力学分析和模态分析,得到声屏障在此激励下的等效应力、总变形量及其模态分布.研究结果表明:相对于列车风致脉动力,自然风荷载对于声屏障的结构性能影响更为显著,声屏障的固有频率远小于外部激励频率,不会发生结构共振现象.%Based on the RNGk-ε model, the fluid distribution of the noise barrier of high-speed railway under the action of train-induced impulsive wind pressure and natural wind load was got, then the computed result asrnimported load was transferred to the structural analysis model through the coupling interface to carry out therntransient dynamic analysis and modal analysis. Finally, the equivalent stress, total deformation and modalrndistribution of noise barrier were got. The result indicates that, compared with train-induced impulsive windrnpressure, the natural wind load has a more prominent effect on the structural performance of noise barrier, andrnits natural frequency is much less than the external load' s. So there will be no resonate happen.