A Calculation Method of Tunnel Lighting Considering Bidirectional Reflection Distribution Function of Sidewalls
A two-way reflection distribution and tunnel lighting technology, which is applied in the field of tunnel lighting calculations, can solve problems such as the large gap between calculated values and measured values, and the difficulty of accurately describing the reflection characteristics of the inner wall, and achieve the effect of auxiliary lighting effects
Active Publication Date: 2022-07-01
CHONGQING JIAOTONG UNIVERSITY
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Prior to this, it is necessary to find an accurate calculation theory of reflective increment, narrowing the gap between the theoretical value and the real value will help to establish a more accurate tunnel lighting design standard, which is of great significance to the realization of tunnel lighting energy saving: Pan Guobing in the literature "Tunnel Lighting Energy Conservation of Interior Materials for Side Walls provides a simulation based on DIAlux software, and proposes a calculation method for reflective increments. However, it is difficult to fully reflect the reflection coefficient of side wall materials with different reflective properties. Reflection characteristics; Yang Tao provided a tunnel lighting increment coefficient based on wall reflection coefficient, road surface reflection coefficient and luminous flux distribution ratio in the literature "Research on Reflection Incremental Coefficient of Tunnel Lighting". Differences in Glare Effect
[0004] The existing tunnel lighting method is difficult to accurately describe the reflection characteristics of the inner wall, which leads to a large gap between the calculated value and the measured value. It is imminent to invent an accurate tunnel lighting calculation method
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[0054] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0055] like Figure 1-8 shown, first of all figure 2 The illuminance calculation of the calculation point of the road surface is carried out on the section shown, and the layout of the lamps and calculation points is as follows: image 3 shown. The lighting of the tunnel adopts LED lights, and its light distribution curve is as follows: Figure 4 shown. The side wall material of the tunnel is made of energy-storing reflective luminescent material. For the sample of the material used to measure the bidirectional reflection distribution function of the material, see Figure 5 .
[0056] The first step: as figure 1 As shown, first calculate the illuminance of the road surface calculation point caused by the direct light of the lamp according to formula (1) (2); the illuminance generated by the direct light of the lamp at the calculation...
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The invention relates to a tunnel lighting calculation method considering the bidirectional reflection distribution function of the side wall, belonging to the field of tunnel lighting calculation, comprising the following steps: S1: calculating the illuminance of a road surface calculation point caused by direct lighting of lamps; S2: discretizing the tunnel side wall , using the finite element idea to discretize the tunnel interior materials into a series of units with a bidirectional reflection distribution function BRDF, and regard them as a unit light source in the lighting calculation process; S3: Calculate the reflective units on each side wall of each lamp in turn S4: Establish the bidirectional reflection distribution function model of the sidewall material; S5: Calculate the light intensity in the direction of the calculation point; S6: Calculate the illuminance caused by the reflection effect at the calculation point; S7: Calculate the calculation point of the road surface considering the reflection increment of the sidewall Illumination; the present invention overcomes the disadvantage that the deviation between the calculated value and the measured value is too large.
Description
technical field [0001] The invention belongs to the field of tunnel lighting calculation, and relates to a tunnel lighting calculation method considering the bidirectional reflection distribution function of side walls. Background technique [0002] The scale of my country's tunnel projects continues to expand, followed by huge operating electricity and maintenance costs. The electricity bill for tunnel lighting in Chongqing is estimated to reach 200 million yuan a year. The huge energy consumption and the green lighting actively promoted by the state are contrary to the measures of energy saving and emission reduction. How to effectively reduce the energy consumption of tunnel lighting under the premise of ensuring driving safety is imminent. In this context, as a new idea, the auxiliary lighting of the inner wall of the tunnel was proposed in Liang Bo's article "Research on the Influence of Diffuse Reflectance of Energy Storage Reflective Materials on Tunnel Lighting Qual...
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IPC IPC(8): G06F30/23G06F30/20
CPCG06F30/23G06F30/20
Inventor 何世永任昱豪
Owner CHONGQING JIAOTONG UNIVERSITY