Integrated Optimization Of Tram Schedule And Signal Priority

As urban congestion and pollution problems become more and more serious,modern trams have developed rapidly due to their large transportation volume and the advantages of environmental protection.Modern trams generally use semi-independent road rights.When driving to an intersection,they may experience increased travel time due to a red light.Therefore,it is necessary to implement signal priority to improve the efficiency of trams at intersections.However,simply giving signal priority to trams will lead to excessive sacrifice of social vehicles along the intersection,and it is difficult to achieve the highest operating efficiency of the intersection.Therefore,from the perspective of maximizing the overall benefits of trams and social vehicles,it is necessary to thoroughly study the integrated optimization of tram timetabling and signal timing along intersections.This dissertation takes the tram under the semi-independent road right as the object.First,from the perspective of timetable preparation,considering the probability distribution of stop time caused by the fluctuation of the station's traffic volume,the integrated optimization model of tram operation and signal timing along the intersection is established.Optimize the model to maximize the expected value of the overall operating efficiency of trams and social vehicles.Furthermore,considering the scenario of delays in trams,study the adjustment of tram hours and the initiative and integrated optimization of signals along intersections to achieve minimum weighted per capita delay between tram passengers and social vehicle users.The main content of the dissertation includes:?1?In the tram scheduling stage,considering the fluctuation of stopping time,an integrated optimization model of tram timetable and social vehicle green wave control is established.By adjusting the running time division of each sub-section of the tram and the signal timing parameters of intersections along the line,the minimum expected travel time of the tram and the maximum green band width of the social vehicle are realized.The model is solved using CPLEX.Taking a domestic tram line as an example,the technical and economic indicators?such as tram travel time,social vehicle green wave bandwidth,etc.?of the scheme obtained by this model and the existing model are compared to verify the effectiveness of the model.Compared with the two existing studies(TRAMBAND green wave centerline method,Ji et al.^[39]),the actual travel time of the model in the proposed model decreased by 16.5%and 12%,and the number of intersection parking decreased by 35.7%and 18.2%,respectively.The green band width of vehicles increased by 20.9%.?2?During operation,trams may experience fluctuations in stops that cannot be absorbed by the planned timetable,thereby deviating from the planned timetable.To this end,this paper proposes a cooperative optimization model of tram operation time division adjustment and active signal priority.By implementing signal active priority,adjusting tram stop time and interval operation time division,the weighted average delay of tram passengers and social vehicle users is realized.The smallest.Compared with the non-cooperative optimization method?only adjusting the operating time,only implementing unconditional active priority,and only implementing conditional active priority?,the method in this paper can reduce the weighted per capita delay by 22.2%,41.1%and 9.7%,respectively,which makes the overall intersection benefit maximum.