| Environmental deterioration caused by traffic congestion has gradually affected the living ecology.It is urgent to alleviate the traffic pressure on urban roads,and promoting the construction of public transport has become an effective solution.Make full use of transportation resources and combine their advantages in the process of transfer to improve the efficiency of urban transportation system.According to the basic theory of subway and regular bus coordination,this paper studies the compiling of bus schedule from the Angle of operation coordination management optimization.Firstly,through characteristic analysis,the service influence range of the first and last subway stations is delimited,and the service function and positioning of the subway and bus system in the urban public transport system are compared,and then the transfer connection theory between them is introduced.After analyzing the law of passenger flow and using the knowledge of mathematical statistics,the transfer travel time is sampled,the data fitting and parameter estimation are carried out,and the lognormal distribution function is used to describe the transfer travel time distribution from the perspective of cumulative distribution function.Secondly,on the premise of optimizing the departure interval and shortening the transfer time,the transfer passengers are divided into two parts: non-stranded passengers and stranded passengers,considering the capacity limit of buses.Considering the arrival time of the first and last subway stations,the minimum total transfer time cost is taken as the first optimization objective,and the optimization model of departure time and interval is established.Based on the analysis of the minimum departure frequency of receiving bus and ordinary bus,the enterprise cost is divided into subway and conventional bus from the perspective of enterprise operation.Under the condition of different models and limited number of available vehicles,the lowest sum of costs is considered as the second optimization objective to establish a model to minimize the departure frequency of conventional bus.Combining the two objectives and taking the time interval,load rate and number of vehicles as constraints,the multi-objective optimization overall model was constructed according to the above,and the solving algorithm was improved based on the NSGA-Ⅱ algorithm and combined with the model feature design.Finally,taking Shuang gang Station of Nanchang Metro Line 1 as an example,825 buses,211 buses and 520 buses are listed as transfer modes for example verification.Based on field investigation and existing data,MATLAB software is used to optimize the experiment according to the idea of receiving buses at non-uniform intervals and ordinary buses at equal intervals.According to the experimental results,on the premise of meeting the demand of transfer passenger flow,the optimal departure interval between receiving bus and ordinary bus was determined.After comparative analysis of the results before and after optimization,the results of each target value are improved,indicating the effectiveness of the model and algorithm designed in this paper in the transfer connection,the realization of the synchronous optimization of the conventional bus line "1+N",has a certain rationality and effectiveness. |
