Quantitative evaluation of the discomfort glare of a tunnel pergola

Xu, Yunjun; Zheng, Xuan; Hu, Yueqi; Li, Xue; Liu, Haoxue

doi:10.1016/j.tust.2019.103161

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…By comparing the anti-glare structures of different tunnel doors, Ai Jie et al [11] concluded that the shading shed at the tunnel entrance can not only solve the transition problem of road dimming, but also achieve the effect of anti-glare. Yu Xu [12] et al established a quantitative evaluation method for discomfort glare caused by the dark area illuminated by sunlight in the sunshade canopy, and the results showed that the glare value UGR of the equal-distance sunshade canopy was smaller than that of the unequal-distance sunshade canopy. Yang Shaowei [13] studied the anti-glare plant height calculation method in the central partition of the access zone, to replace engineering anti-glare facilities and achieve better ecological and landscape benefits.…”

Section: Introductionmentioning

confidence: 99%

Study on the Glare Phenomenon and Time-Varying Characteristics of Luminance in the Access Zone of the East–West Oriented Tunnel

Xiao,

Liang,

Niu

et al. 2024

Applied Sciences

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In response to the special feature of the east–west oriented road tunnel entrance being easily exposed to direct sunlight, a study was conducted on the glare phenomenon at the access zone for this type of tunnel and on the time-varying characteristics of the L20(S) value outside the tunnel. First, the actual situation of luminance difference inside and outside the tunnel was considered. Field tests were carried out in a 20° field of view of the human eye within a stopping distance. Then, the environment paraments outside the tunnel were collected by combining the environment schematic method with the digital camera method. Finally, the differences and time-varying characteristics between the measured and recommended values of luminance outside the tunnel were analyzed. The PGSV daylight calculation model was used to analyze the glare effect in the 20° field of view of the human eye. The results indicate that the luminance L20(S) outside the tunnel towards the east (west) generally shows a trend of first increasing and then decreasing, and reaches its maximum value in the morning (afternoon). The difference in the contribution ratio of luminance inside and outside the tunnel for this type shows an overall trend of first increasing and then decreasing, and the maximum difference appears in the morning (afternoon), reaching about 97% and 96% respectively. The time-varying characteristics of glare in the access zone of an east (west) oriented road tunnel are roughly consistent with the variation trend of the luminance L20(S) outside the tunnel and exceed the intolerable glare limit. Due to direct sunlight, the luminance outside the tunnel is too high, resulting in an uncomfortable glare that the driver cannot tolerate, becoming more serious after rainfall, and which affects driving comfort and safety.

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Section: Introductionmentioning

confidence: 99%

Study on the Glare Phenomenon and Time-Varying Characteristics of Luminance in the Access Zone of the East–West Oriented Tunnel

Xiao,

Liang,

Niu

et al. 2024

Applied Sciences

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“…Thereafter, the merits and applications of multiple light sources were recommended [5]. In recent years, many scholars have recommended methods for evaluating a glare index, and UGR is the most frequently applied method [6][7][8]. With the development of artificial light sources, the manufacturers of light fixtures have employed different glare-reducing approaches.…”

Section: Introductionmentioning

confidence: 99%

CSP-LEDs Combined With Light Guide Without Reflective Matrix for Antiglare Design

Ruan

Kuo³

2020

IEEE Access

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This study proposed a model with different luminous intensity profiles without reflective matrix bar for light fixtures that used asymmetric luminous intensity(ALI) CSP-LEDs (Chip Scale Package-Light emitting diode) combined with light guide as light source module, and analyzed illumination uniformity and unified glare rating (UGR) performance by using a classroom as an example. The study constructed a model of light fixture use in classrooms. Four important parameters affect the comfort of human eye that include UGR, illumination, uniformity of spatial and light distribution of light fixture, in particular, light distribution of light fixture was major affect factor for direct glare. Therefore, light fixture designers previously used many diverse structures to prevent glare, but which will result in a loss of light fixture efficiency about 25%-35% that caused by material absorption and ray loss. This study proposed used ALI CSP-LEDs combined with light guide as light source to optimize different light distribution angles without attached reflective matrix bar or second optical lens on light fixture to simulate a light fixture in a classroom and to evaluate UGR, illumination and uniformity values. We also consider the light fixture tilt angle caused effect of UGR and uniformity. On the basis of the simulation and experimental results, ALI CSP-LEDs beam angle relative to vertical and horizontal axes were 150 0 and 120 0 , respectively, the light distribution profile for a beam angle 90° provided the highest illumination uniformity and a UGR of less than 19. Thus, light fixtures with a light distribution angle of beam angle 90° supply human-friendly for anti-glare lighting.

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