青藏铁路客车沿程需氧量仿真研究

摘要

Passenger cars running in the Golmud-Lhasa section of the Qinghai-Tibet Railway are taken as samples for improving the oxgen supply system of the cars.The Lumped Parameter Method is employed to establish a dynamic model of the changes of oxygen content inside the cars, and the Matlab's SimuLink is used to simulate the internal oxygen level of the cars.The oxygen content curves inside and outside the cars are acquired under respective circumstances i.e.: no oxygen supply and the supply being controlled to keep the oxygen pressure at 13.7 kPa.Moreover, the least real-time oxygen supply amount along the railway and the least final total amount are obtained.These results are compared with the results of practical engineering formulas based on a steady-state.Analyses show that a little modification to the practical engineering formulas would make the two results become very close.Consequently, it is simple and feasible to calculate the oxygen demand with the modified steady-state practical engineering formulas instead of the dynamic mothed.%为研究和改进青藏铁路旅客列车供氧系统,以格尔木一拉萨段青藏铁路旅客列车为例,采用集总参数法建立列车内部含氧量变化的动态数学模型,运用MATLAB软件的SimuLink工具对车内含氧量进行仿真,分别得到不供氧和以13.7 kPa氧分压持续供氧情况下的列车内外氧含量变化曲线,以及沿程最低需氧量和累计的最低需氧量总和.将这些结果与基于稳态的供氧量工程实用表达式的计算结果进行比较,经分析得知,只需将工程实用式稍加修正,两者结果就会非常吻合.这说明用修正后的工程实用式代替动态法计算客车需氧量简便可行.