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对设置在交通运输部北京试验场的230个交通标志反光膜样本进行了连续13年的逆反射系数观测,建立了不同颜色、不同类别的交通标志反光膜逆反射系数衰减值的预测模型,分析了逆反射系数随设置时间的衰减规律。分析结果表明:白色Ⅰ~Ⅲ类反光膜逆反射系数衰减值的预测模型分别为三次函数、对数函数、三次函数模型,决定系数分别为0.581、0.732、0.559;红色Ⅰ~Ⅲ类反光膜逆反射系数衰减率的变化幅度分别为16.0%、28.0%、42.0%,其他颜色反光膜逆反射系数衰减率的变化幅度小于21%。可见,逆反射系数衰减值的二次函数、三次函数模型具有更好的拟合性,不同颜色、不同类别反光膜的逆反射系数衰减规律存在显著差异,但衰减均随着设置时间的延长而逐渐减缓。
The retroreflective coefficient of 230 traffic sign reflective film samples set up at the Beijing test site of the Ministry of Transport was continuously measured for 13 years and the predictive model for the retroreflection coefficient attenuation value of traffic sign reflective film of different colors and different types was established. The coefficient of retroreflection decays with setting time. The results show that the predictive models for the retroreflection coefficient attenuation values of white Type Ⅰ ~ Ⅲ reflective films are cubic, logarithmic and cubic function models respectively, with the coefficients of determination of 0.581, 0.732 and 0.559, respectively. The red type Ⅰ ~ Ⅲ retroreflective film inverse The decay rate of the reflection coefficient is 16.0%, 28.0% and 42.0%, respectively. The decay rate of the retroreflectivity of other reflective films is less than 21%. It can be seen that the quadratic function and the cubic function model of attenuation value of retroreflection coefficient have better fitting property, and there are significant differences in the attenuation law of retroreflectivity of retroreflective film with different colors and different types of retroreflective film. However, with the increase of setting time Slow down.