Numerical Simulation Optimization Study on the Utilization Coefficient of High-pressure Sodium Lamps for Urban Roads (Figure)

According to the urban road lighting design standard C45-2006 issued by the Ministry of Construction, urban road lighting can be divided into two types: motor vehicle traffic road lighting for motor vehicles and pedestrian road lighting for non-motor vehicles and pedestrians. The content is motorway traffic road lighting.

Nowadays, urban road lighting designers generally use lighting calculation simulation software and luminaire utilization coefficient method for lighting design. Although the lighting design software is relatively high, the official version of the lighting simulation is relatively expensive and not popular in China. The luminaire utilization coefficient method is widely used in domestic lighting design because of its practicability and convenience.

However, when using the luminaire utilization coefficient method, urban road lighting design generally uses a range of 0.30.5, which is quite subjective. For example, when the luminaire utilization factor of 0.4 is appropriate, if the designer chooses the utilization factor of 0.3, there is a problem of wasting lighting energy and increasing investment in the initial lighting facilities; if the utilization factor of 0.5 is used, it will bring unsatisfying The standard value of the lighting required by the specification poses a safety hazard to the driver. Therefore, in the case of the conditions, the paper uses the lighting simulation software and through the calculation and summary, and pushes the utilization factor of the lighting fixture to provide a more accurate and perfect fuzzy lamp utilization factor for the majority of lighting designers. 20124) 840 Zhao Tieyuan, senior engineer, E~mail supplemental construction technology table 1 motor vehicle traffic road lighting standard value level road surface brightness road illumination glare limit threshold increment (%) maximum initial value environment ratio SR minimum road type average brightness La "(cd maintenance value 2 total uniformity minimum longitudinal uniformity UL minimum average illuminance Eav maintenance value uniformity Ue minimum fast road, trunk road trunk road branch following characteristics: it, tree planting on both sides of the urban road It is not very dense and does not affect the lighting. Secondly, the selected lamps are high-pressure sodium lamps with a height of 1 m, which is usually selected for urban roads. The cloth lamps are selected as the more common bilateral symmetrical lamps.

2 Road lighting simulation 2.1 Research content Due to the large spacing of urban road lighting fixtures, the lighting efficiency is more complicated, but the main influencing factors are the distance between the lamp head and the edge of the lamp. Therefore, this paper studies the relationship between these two influencing factors and the fuzzy luminaire utilization coefficient, and proposes measures to help solve the rationality and economy of urban road lighting distribution according to these relationships and laws. The main research conditions of this paper are as follows. 1 working condition 1 lamp head is 1m away from the edge of the road, the inclination of the lamp is 0.,5.,10.,15.,20.;2 working condition 2 lamp head is 3m away from the edge of the road, the inclination of the lamp is 0.,5. ,10.,15.;3 working condition 3 lamp head distance 5m from the road edge, the inclination of the lamp is 0. 2.2 Simulation process Dialux is used for the specific process of urban road lighting simulation. Lamp parameter input 4 environment modeling (according to design requirements) 4 calculation 4 calculation results finishing.

2.3 Simulation scenario According to Qianxi Road in Wuxi City, Jiangsu Province, it is a simulation object. The simulation lamp is a 400W high-pressure sodium lamp with a luminous flux of 47000lm. The simulation interface is shown in the figure. The specific parameters are shown in the figure. In this case, the software interface is not simulated. Data processing 3.1 Calculation method The average horizontal illumination of the road surface can be pressed.

3), 4) 3 conclusions, in the design and construction of urban road lighting fixtures, we must first select the cantilever length of the lamp (cantilever pattern), and then adjust the tilt angle of the street lamp according to different road sections to ensure that the optical axis is illuminated on the road. central.

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