Zhongzhao.com On October 16, the first batch of Boston Orange Line subway cars developed by CRRC Changchun Railway Co., Ltd. was successfully launched in Changchun. It is expected to arrive in the US in December this year. This is the first batch of China to be completely American standard subway car with independent intellectual property rights.
The lower line of the Orange Line subway further marks that China's many technologies have been recognized by the world, and the wisdom and dedication of experts in various industries in China are behind. The Lighting and optics in the subway are crucial for the personnel in the subway. We know that the subway will face various working conditions during driving. Under different working conditions, the driver is in a different light environment. From direct sunlight to a completely dark underground tunnel, the illumination level in the driver's room can vary by 5~6. An order of magnitude, and because the subway is at high speed, the light environment continues to change at high speed. In such a light environment, drivers need to complete various driving tasks to avoid human error rate. Therefore, the light pollution prevention and control of the subway cab is very important. Prof. Lin Yandan from Fudan University undertook the glare analysis work of the driver room of the Orange Line Metro, which provided guidance for the prevention and control of light pollution in the driver's cab.
The light environment of the subway under two extreme light conditions
Disability glare is a major problem of light pollution in the driver's cab of the subway. Disability glare is a glare that has a direct physiological connection with the eye, and is also called physiological glare. The mechanism of formation of disabling glare has been clarified and understood. The process of production was first discovered by Holladay, who believes that this process is the process by which light scatters in the medium of the eye. When light enters the eye, photons collide with substances in the eye, such as the cornea, lens, and vitreous. In each collision, photons scatter and form a light curtain on the retina. Among them, 25~30% of stray light is emitted from the cornea, about the same proportion is generated from the lens and vitreous, and the rest is scattered by the retina itself. The light curtain reduces the brightness contrast of objects around the light source, which has the same effect as increasing the background brightness of the object, thereby reducing the detection capability of the human eye. Disability glare is commonly measured by the equivalent light curtain brightness (Lv), and its degree can be expressed in terms of threshold increment (TI), which is the ratio of the brightness of an object that can be seen when there is glare to the absence of glare.
Uncomfortable glare weakens visual function to a certain extent, affecting visual performance and work efficiency. In important visual work situations, such as transportation, aerospace, and heavy industry, even safety hazards may occur. Long-term effects may cause psychological discomfort and visual fatigue, which may lead to irritability, inattention, migraine, eye diseases and other physiology. Discomfort. In this project, Professor Lin’s team, from the overall requirements of lighting and identification, analyzes the source of light pollution in the driver's cab through modeling, simulation and ergonomic experiments, improves the overall light environment quality of the driver's cab, and creates good and comfortable for the driver. The working conditions and environment make the visual fatigue to a minimum.
Professor Lin's team completes the visual task of the bridge
Editor: Yan Zhixiang
SHENZHEN CHONDEKUAI TECHNOLOGY CO.LTD , https://www.szsiheyi.com