400 km/h高速铁路典型路基段风致行车安全研究

Study on wind-induced operation safety in typical subgrade sections of 400 km/h high-speed railways

以某设计速度400 km/h的高速铁路4种典型路基段结构为研究对象,采用风车路耦合动力分析方法,运用ANSYS和多体动力学软件SIMPACK分别建立路基和列车模型,分析CRH380动车组在环境风速20~40m/s区间工况,以速度400 km/h通过时车辆的动力响应。根据评价准则提出风致行车安全控制指标。结果表明:车体横向加速度反映列车横风稳定性,可以作为风致行车安全的控制指标;脱轨系数随着风速增大而增大,在风速不超过40 m/s条件下,均未达到上限值0.8;4#路基段可以承受的环境风速最大,风致行车安全的效果最好;背风侧的车辆响应指标均明显好于迎风侧,对于横风影响下的动力仿真分析,应将迎风侧作为主要研究对象。

Focusing on four representative subgradesection structures of a high-speed railway designedfor speeds of 400 km/h, this article investigates thesubgrade and train models that are established throughthe windmill road coupling dynamic analysis methodand the ANSYS and multi-body dynamics softwareSIMPACK method, respectively. In doing so, thedynamic response of the CRH380 when passing ata speed of 400 km/h under 20-40 m/s ambient windspeed is analyzed. Based on the evaluation criteria,a control index of wind-induced operation safetyis proposed. The findings indicate that the lateralacceleration response of the vehicle body serves as aviable control parameter for wind-induced operationsafety. In addition, the lateral to vertical force ratioincreases with increasing wind speed, but remainsbelow the upper limit of 0.8 even at wind speeds up to40 m/s. The 4# subgrade section exhibits the highesttolerance to maximum ambient wind speeds, offeringoptimal wind-induced operation safety. Moreover,the vehicle response index on the leeward side issignificantly greater than that on the windward side.This suggests that the windward side should be theprimary focus for the dynamic simulation analysisunder the influence of crosswind.