Research On Dynamic Controlling Method Of Lighting In The Subway Platform

The rapid development of urban rail transit has brought new challenges to the lighting energy saving and light environment comfort of subway stations,which are increasingly large-scale,complex and limited by natural light.It is vital to reduce lighting energy consumption and improve lighting quality.This subject is funded by the National Natural Science Foundation Project " Research on the Influence and dynamic regulation mechanism of artificial lighting environment in the spatial cognition of urban underground space(No.51678470)",and based on Environmental Behavior,Passenger distribution and Control theory to carry out research on the lighting controlling method of the subway platform that couples lighting energy saving and lighting environment comfort.The research is carried out around the lighting controlling plan of subway platform,passenger distribution simulation,lighting controlling model and dynamic control method of lighting in subway platform,etc.The main tasks completed are:(1)Research on the basic scheme of lighting control by integrating lighting energy saving and improving the comfort of lighting environmentDiscuss the basic elements of lighting environment that affect lighting energy consumption and lighting environment comfort,and determine the changing law of lighting environment elements to provide guidance for dynamic lighting control.By analyzing the advantages and disadvantages of the existing dimming methods,the public area of the platform is adjusted and controlled by partitions.Based on the sub-region division of the public area of the platform,the mutual influence of the sub-area illuminance is considered,and the ‘Coupling illuminance coefficient’ is introduced.The establishment of the mathematical model of light control and the proposal of the method of dynamic light control lay the foundation.(2)Research on simulation of passenger distribution on subway platform based on changes in passenger flowBased on the survey data of an underground standard island platform on Xi’an Metro Line 4,combined with the results of the public area of the platform,the pedestrian traffic simulation software Anylogic is used to establish a subway platform passenger distribution simulation model,and short-term passenger flow data is used as the input of the simulation model,Carry out pedestrian traffic simulation to obtain real-time passenger distribution data on platforms under different passenger flow intensities.Through the analysis of the simulation results of the platform passenger distribution,the light adjustment time,the passenger service level classification and the population density in the sub-area are determined,which provides the basis for the detailed calculation of the sub-area illumination setting value.(3)Research on the lighting controlling model of the subway platform based on the principle of RGB three-color mixingBy investigating and investigating the basic data of the selected platform’s architectural form and building materials,a three-dimensional simulation model of the physical platform is established,and based on the platform lighting system survey data and the related design management requirements of subway station lighting,the selection,layout and grouping of lamps are carried out,so as to Establish a physical platform lighting simulation model in DIALux software,and use it for lighting simulation to obtain illuminance data,establish a basic data model of the platform light environment;explore the luminous flux,color temperature,dimming ratio,and duty cycle of LED light source RGB three-color lamp beads Combining the basic data model of platform illuminance and optimal control theory,establish a mathematical model of minimum energy consumption optimization of platform light control,and use the dimensionality reduction processing method based on variable independence analysis to deal with the equality constraints in the lighting controlling model,Established a mathematical model without equality constraints for platform illumination control.(4)Research on dynamic controlling method of lighting in the subway platform based on Adaptive opposition-based learning-genetic algorithmAiming at the shortcomings of genetic algorithm,an adaptive reverse learning based on fitness to improve genetic algorithm(AOBL-GA)to develop the potential ability of GA parallel mechanism,and it is applied to the solution of light control model.AOBL-GA is feasible and the lighting controlling model is accurate.The lighting controlling method is used to adjust the light of the actual working day to get the optimal dimming ratio of minimum energy consumption.The calculated lighting energy consumption shows that the dynamic lighting controlling method is feasible,and the optimal control of platform lighting is realized.The proposed lighting controlling method of the subway platform can achieve a light regulation deviation of less than 1.33%.While accurately regulating the illumination and color temperature to improve the comfort of the light environment,the energy saving rate of the power consumption can reach 51.98% compared with the existing dimming method in the selected subway platform,which significantly reduces the lighting energy consumption.This research will provide data support for the lighting design and energy-saving renovation of new and existing subway stations.