A multistage subway freight network system based on axial layout and a construction method
A network system and subway technology, applied in the fields of instruments, data processing applications, forecasting, etc., can solve problems such as the service capability of the joint site selection system, and achieve the effect of improving economic feasibility.
Pending Publication Date: 2019-06-25
ARMY ENG UNIV OF PLA
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Problems solved by technology
However, the network planning of subway freight, especially the design and optimization method of the connection between underground logistics and the ground is still in a "vacuum period". What needs to be solved urgently is the division of logistics functions, the joint site selection of ground and underground nodes, and the definition of system service capabilities, etc. question
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[0042] The invention provides a multi-level subway freight network system and construction method based on hub-and-spoke layout, and the specific implementation method includes.
[0043] (1) For the evaluation problem of underground freight volume in step 1, considering the capacity constraints of nodes and tunnels, and without changing the subway passenger transportation arrangement, screen the demand objects, determine the service scope of the subway freight system, and construct the entropy-weighted TOPSIS underground The comprehensive evaluation model of cargo volume, the steps are as follows:
[0044] Step 1 Construct the dimensionless discriminant matrix of the index w ijk For the j-th subsystem (demand point set) in the k-th logistics park open decision-making set, the evaluation index w ijk The observed value of , the best value of the i-th index is taken as The worst value is The efficiency coefficient μ is introduced for transformation, and the normalized data...
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The invention discloses a multistage subway freight network system based on axial layout, the system comprises an urban logistics park, underground logistics nodes, a ground terminal and a client demand point, and the client demand point belongs to the service range of the ground terminal as a station for delivering cargos to customers. Meanwhile, the invention provides a construction method of the multistage subway freight network system, aiming at the characteristics of limited transport capacity, high timeliness and the like of the subway freight system, based on the existing demand point characteristics, three indexes are provided, and an underground freight OD comprehensive evaluation model is constructed to determine the service range of the system. Secondly, the optimal comprehensive cost is taken as a target, from the perspective of operation research, a double-layered node site selection-distribution model is established; a model decomposition process is formulated through model distribution, an accurate algorithm and heuristic algorithm solving steps are designed for two main problems, and the transportation cost, capacity limitation, facility layout balance and the utilization rate are optimized.
Description
technical field [0001] The invention relates to the field of underground logistics system and related subway cargo transportation, and relates to an urban subway freight network system. Background technique [0002] Freight on Transit (FOT) using the urban rail transit system can greatly reduce direct or indirect economic losses caused by road congestion, exhaust pollution, and traffic accidents. Transferring goods from the ground to the ground, directly connecting the logistics park with the urban distribution center or even the terminal station through the urban subway system, providing fast, efficient, stable, and standardized logistics services, has gradually attracted widespread attention from the industry and academia. At this stage, FOT has been successfully put into operation. In Paris, a commuter line D operated by the National Railway Company (SNCF) is used to supply large chain supermarkets in the city; another TramFret plan in Paris uses The loop tram network re...
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Login to View More IPC IPC(8): G06Q10/04G06Q10/08G06Q50/30
CPCY02P90/30
Inventor 陈志龙董建军胡万杰郭东军陈一村任睿
Owner ARMY ENG UNIV OF PLA