列车表面涂层光老化试验加速因子建模研究

目的建立客观、定量的列车表面防护涂层实验室模拟紫外辐射当量对自然太阳紫外辐射的加速因子计算模型。方法以兰新高铁为例,设计一种建模方案,主要步骤包括选取建模列车站点、确定站点气象地理区划、计算站点环境变量影响距离、建立站点太阳辐射环境谱,分别建立二级气象地理区划、一级气象地理区划和全线太阳辐射环境谱,最后,建立加速因子模型。结果基于NASA Surface Meteorology and Solar Energy(SSE)地面太阳辐射数据,结合实验室条件,计算了兰新高铁表面防护涂层紫外光老化试验的加速因子,约为9.5。结论上述实验室光老化试验加速因子建模思路,解决了列车这种跨越大范围区域的装备光老化试验加速因子的计算问题,简单实用,可推广至飞机、轮船、汽车等相似装备表面涂层以及金属等其他材料的紫外光暴露试验评价。

Accelerating Factor Modeling of Ultraviolet Radiation Aging Test of Train Surface Coating

The work aims to establish an objective and quantitative calculation model for the accelerating factor in simulated ultraviolet radiation test of train surface coating in the laboratory. Taking the Lanzhou-Wulumuqi High-speed Railway as an example, a modeling scheme was designed. The main steps included the following:selecting modeling train stations, determining site meteorological geographic divisions, calculating the impacting distance of site environmental variables, establishing site solar radiation environmental spectrum and setting up the solar radiation environmental spectrum due to first-level meteorological geographic division, second-level meteorological geographic division and full-scale railway respectively. Finally, an accelerating factor model was established. Based on NASA Surface Meteorology and Solar Energy (SSE) ground solar radiation data and laboratory conditions, the accelerating factor in the ultraviolet radiation aging test of the train surface coating of the Lanzhou-Wulumuqi High-speed Railway was calculated to be about 9.5. The problem of calculating the accelerating factor of the ultraviolet radiation aging test of the equipment across a large area is solved due to above-mentioned modeling scheme of ultraviolet radiation aging test. It is simple and practical and can be extended to the surface coating of similar equipment such as airplanes, ships and automobiles, and evaluation of UV exposure test of other materials such as metals.