公路隧道遮光棚频闪效应可见度研究

为改善驾驶员出入隧道时的行车舒适性,应在公路隧道格栅式遮光棚概念设计时采取有效措施降低频闪效应。基于太阳辐射理论模型,分析太阳辐射季节变化对格栅频闪光波的影响;引入频闪效应可见度指标,定量评估强太阳辐射时格栅式遮光棚下光波的频闪效应;并基于频闪效应可见度分析格栅周期、亮度占空比和调制深度等因素对格栅式遮光棚频闪效应的影响。最后,结合实际工程案例对格栅式遮光棚下频闪效应的降低进行了设计优化。结果表明: 1) 频闪效应可见度与格栅周期和太阳辐射强度密切相关,与太阳辐射角无关; 2)在特定的格栅周期内,调制深度可显著地调节频闪效应可见度,而亮度占空比对频闪效应可见度的影响可以忽略不计。

Study on Stroboscopic Effect Visibility of GrilleShading Shed in Highway Tunnels

Some effective measures should be undertaken duringthe conceptual design of grille shading sheds to reduce the stroboscopic effectand improve the drivers′ driving comfort degree. First, theeffect of seasonal variation of solar radiation on the grille stroboscopic waveis examined based on a theoretical model of solar radiation. Second, the stroboscopiceffect visibility measure (SVM) index is introduced to quantify thestroboscopic effect induced by the stroboscopic wave under the grille shadingshed subjected to strong solar radiation. Third, the SVM is used to examine theeffects of grille period, brightness duty cycle, and modulation depth on thestroboscopic effect in grille shading sheds. Finally, in a practicalengineering case, an optimal design for reducing the stroboscopic effect of thegrille shading sheds is proposed. The findings are as follows: (1) The SVM isrelated to the grille period and the intensity of solar radiation, but not tothe incident angle. (2) The SVM is closed to modulation depth within a certainrange of the grille period, while the effect of the brightness duty cycle onthe SVM can be ignored.