Research On The Measurement Of The Carrying Capacity Of Logistics Network With Cities As Nodes

Transportation and logistics industry is a pillar industry to support modern circulation and smooth supply and demand cycle,and build a transportation and logistics system to strengthen the construction of logistics network is a powerful support to protect economic development.Under the current situation,the construction of transportation and logistics system should not only be adapted to the domestic development needs,but also dovetail with the international economic cooperation structure.Therefore,this thesis takes 20 inland cargo nodes and railroad hub nodes in the " China Railway Express Construction and Development Plan " as the research objects,and conducts research on the node cities’ logistics network bearing capacity for China-Europe Class Train in view of the current problems of unclear node function positioning and inconspicuous logistics network system,in order to promote the efficient operation of logistics network.This research firstly combined with the theory of hub-and-spoke logistics network,and used the social network analysis method to divide the logistics node levels from the node cities’ own logistics strength,the logistics connection characteristics between node cities and the core degree of node cities in the network.And by measuring the radiation range of nodes at each level,the logistics channels were divided to form a mixed axial-spoke logistics network of node cities.Secondly,the comprehensive index method was used to calculate the logistics node bearing pressure,exerting pressure and regulating force,and measure the bearing capacity of logistics nodes according to their relationship with the bearing capacity.And the time-dependent demand fluctuation coefficient was introduced to measure the bearing capacity of logistics channels under different demand fluctuations,and the comprehensive bearing capacity of logistics network was calculated by combining the measurement results of logistics nodes and logistics channels.Finally,based on the barrier degree model,the main influencing factors of the bearing capacity of logistics network were explored,so as to put forward the suggestions for the improvement of the bearing capacity of logistics network.The main conclusions of this research were as follows:(1)Beijing,Chongqing,Suzhou and Wuhan are axis nodes,Tianjin,Jinan,Xi’an,Chengdu,Zhengzhou,Nanjing and Hangzhou are spoke nodes,and the remaining cities are ordinary nodes.According to the radiation range,the logistics corridor,the logistics trunk corridor and the logistics branch corridor are divided,thus forming the hybrid hub-and-spoke logistics network.The "Beijing Logistics Circle","Wuhan Logistics Circle","Suzhou Logistics Circle" and "Chongqing Logistics Circle" are formed around the axis nodes.(2)The bearing capacity measurement of logistics nodes shows that Chongqing and Beijing have high bearing capacity,Wuhan,Chengdu,Hangzhou,Suzhou and Tianjin have moderate bearing capacity,and the rest of the cities have low bearing capacity.The logistics channels with high carrying capacity form a dense triangle around Beijing,Chongqing,Suzhou and Wuhan.The comprehensive carrying capacity of logistics network and the coefficient of timeliness demand show a strong positive correlation.(3)Logistics infrastructure,informationization level,transportation and logistics investment,logistics supply and demand are important factors that hinder the improvement of carrying capacity.And based on this,the suggestions for the improvement of the logistics network bearing capacity are proposed from three aspects: logistics infrastructure supply capacity,logistics channel construction,logistics transportation system.