高速列车脉动压力作用下声屏障疲劳性能分析  

Fatigue Properties Analysis on Noise Barrier under Aerodynamic Pressure of High Speed Train

作　　者：康健[1] 李人宪[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《机械工程与自动化》2016年第1期23-25,共3页Mechanical Engineering & Automation

摘　　要：采用计算流体力学数值仿真方法计算列车通过时的声屏障表面受到的列车脉动压力,利用流固耦合与有限元结构分析方法,对声屏障结构进行强度计算和疲劳性能分析。计算结果表明:列车通过时产生的脉动压力随时间和空间变化,列车速度变化对声屏障气体作用力的影响比中心距(轨道中心线与声屏障的距离)变化更大;每当列车经过一次,H型钢立柱发生弯扭组合变形,且弯曲有2次换向,而扭转则经历4次换向;按照现有标准设计的声屏障立柱疲劳安全系数可能偏大。The fluid dynamics numerical simulation method is used to calculate the aerodynamic pressure of high speed train.By use of the fluid-structure interaction and finite element method,this paper performed the strength and fatigue properties calculation for the noise barrier structure.The results indicate that the impulsive pressure of the train varies with time and space,and is influenced by the speed of train much more than the center-to-center distance.When the high speed train passes,the H-steel column will experience bend and torsion deformation simultaneously,the bend deformation changes direction twice and the change of torsion deformation＇direction is four times.The fatigue safety factor of the H-steel column is so large that there is waste of resources.

关 键 词：声屏障 脉动压力 流固耦合 疲劳 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术] U292.914[自动化与计算机技术—计算机科学与技术]