Volume 39 Issue 2
Apr.  2021
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ZHENG Kexin, SONG Rui, LI Guangye. An Optimization Model of Dynamic Allocation of Empty Railway Cars Based on Time-space Network[J]. Journal of Transport Information and Safety, 2021, 39(2): 145-152. doi: 10.3963/j.jssn.1674-4861.2021.02.018
Citation: ZHENG Kexin, SONG Rui, LI Guangye. An Optimization Model of Dynamic Allocation of Empty Railway Cars Based on Time-space Network[J]. Journal of Transport Information and Safety, 2021, 39(2): 145-152. doi: 10.3963/j.jssn.1674-4861.2021.02.018

An Optimization Model of Dynamic Allocation of Empty Railway Cars Based on Time-space Network

doi: 10.3963/j.jssn.1674-4861.2021.02.018
  • Received Date: 2020-10-03
  • The paper studies the dynamic optimization of the empty car distribution within the railway administration (or company)to reasonably allocate empty cars. The time-space network with different periods is constructed to describe the changes in work capacities of railway stations. By referring to transportation problems, dynamic empty-car distribution is transformed into the multi-commodity network flow based on the time-space network by increasing the supply and demand constraints. Combining the characteristics of empty car distribution, the paper develops two sets of integer decision variables and considers discharging and assigning empty cars separately. 0-1 auxiliary variables are set to construct substitution constraints of car types. On this basis, a mixed-integer programming model for the dynamic optimization of empty-car distribution is constructed to minimize the total cost. The feasibility and effectiveness of the model are verified by taking empty-car distribution in Kunming railway administration as a case study. The results show that dynamic empty-car distribution is superior to static empty-car distribution in reducing the total cost and fitting the actual process. The complexity of solving the model is reduced by improving the time-space network compared with the existing methods of dynamic empty-car distribution. The model can obtain the scheme of empty-car distribution and check the operation status of empty cars at different times intuitively.

     

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