风沙雨雪环境下列车安全运行仿真平台开发

发布时间：2018-05-30 12:27

本文选题：高速列车 + 极端天气　；参考：《西南交通大学》2016年硕士论文

【摘要】：高速列车运行环境复杂,恶劣的气候环境对列车的运行安全有一定的影响。分析极端天气对列车空气动力学性能的影响能够在一定程度上为列车的安全运行评估提供科学依据,并为之后的深入研究打下基础。本文在现有商业CFD软件ANSYSY ICEM CFD、FLUENT、EnSight及多体动力学软件SIMPACK基础上采用C#语言二次开发了一款专门用于列车气动安全分析的仿真平台。该仿真平台具有以下功能：根据用户提供的列车头车及中间车模型自动生成整车模型及计算区域,并在此基础上自动划分结构化或分结构化网格；用户可以根据自己的计算需求选择不同的计算环境进行计算,计算环境包括标准环境、横风环境、沙尘环境、降雨环境及降雪环境；除针对不同环境进行稳态计算外,仿真平台还可以进行标准环境下的瞬态计算,包括明线交会、隧道通过、隧道交会及通过挡风墙；计算完成后用户可以在后处理模块中得到相应的后处理结果并自动生成气动力计算报告；气动力计算完成后,将得到的气动力文件导入到动力学计算模块中可以进行该气动力下的安全性计算,并得到五个动力学指标。在仿真平台开发完成后利用该平台对典型列车在不同天气下的气动力及动力学性能进行了分析,并得到了列车气动力及动力学指标随沙尘浓度、降雨量及降雪量的变化规律。研究结果表明：列车运行速度较低时两相流对列车运行阻力的影响较小；随着列车运行速度的提高,颗粒相对列车气动阻力影响越来越大：不考虑轮轨接触等因素的影响时,在风沙、风雨、风雪三种环境中,风雨环境对列车动力学性能影响最大,其次是风沙,风雪影响最小。
[Abstract]:The running environment of high-speed train is complex, and the bad weather environment has certain influence on the train operation safety. The analysis of the influence of extreme weather on the aerodynamic performance of trains can provide a scientific basis for the evaluation of train safety to a certain extent and lay a foundation for further research. Based on the existing commercial CFD software ANSYSY ICEM CFDF fluent EnSight and the multibody dynamics software SIMPACK, a simulation platform for train aerodynamic safety analysis is developed using C # language. The simulation platform has the following functions: the whole vehicle model and the calculation area are automatically generated according to the train headstock and intermediate car model provided by the user, and on this basis, the structured or sub-structured grid is automatically divided; Users can choose different computing environments according to their own computing needs. The computing environment includes standard environment, cross wind environment, sand and dust environment, rainfall environment and snowfall environment. The simulation platform can also be used for transient calculation in standard environment, including open line intersection, tunnel crossing, tunnel crossing and passing through windshield wall. After the calculation is completed, the user can obtain the corresponding post-processing results in the post-processing module and automatically generate the aerodynamic calculation report. The obtained aerodynamic files can be imported into the dynamic calculation module to calculate the safety of the aerodynamic force, and five dynamic indexes can be obtained. After the development of the simulation platform, the aerodynamic and dynamic performances of typical trains under different weather conditions were analyzed, and the variation of train aerodynamic and dynamic indexes with the concentration of sand and dust, rainfall and snowfall were obtained. The results show that the effect of two-phase flow on train running resistance is small when train running speed is low, and with the increase of train running speed, the influence of particle relative to train aerodynamic resistance is more and more great: when the influence of wheel / rail contact and other factors is not considered, In the three environments of wind and sand, wind and rain, wind and snow, the wind and rain environment has the greatest influence on the train dynamic performance, followed by the wind and sand, and the wind and snow have the least impact on the train dynamic performance.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U298.1

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