Journal of Transportation Systems Engineering and Information Technology ›› 2023, Vol. 23 ›› Issue (6): 262-273.DOI: 10.16097/j.cnki.1009-6744.2023.06.026

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Distribution Routing Problem with Time Window Under Constraint of Pallet Loading

LIU Yong*,YUE Zhi-cheng,WANG Yong   

  1. a. School of Economics and Management; b. Chongqing Key Laboratory of Intelligent Logistics Network, Chongqing Jiaotong University, Chongqing 400074, China)
  • Received:2023-08-02 Revised:2023-08-28 Accepted:2023-09-08 Online:2023-12-25 Published:2023-12-23
  • Supported by:
     Social Science Foundation of Chongqing of China (2020BS62);The PhD Direct Train Research Program of Chongqing (CSTB2022BSXM-JCX0116);Open Fund of Chongqing Key Laboratory of Intelligent Logistics Network (KLILN2023YB006)。

托盘装载约束下带时间窗的配送车辆路径优化研究

刘永*,岳志城,王勇   

  1. 重庆交通大学,a. 经济与管理学院;b. 智能物流网络重庆市重点实验室,重庆 400074
  • 作者简介:刘永(1983- ),男,湖北襄阳人,高级实验师,博士。
  • 基金资助:
    重庆市社会科学规划项目 (2020BS62);重庆市博士直通车科研项目 (CSTB2022BSXM-JCX0116);智能物流网络重庆市重点实验室开放基金(KLILN2023YB006)。

Abstract: To address issues such as chaotic delivery, this paper introduces pallets with adjustable support structure heights as carriers for loading and unloading in delivery services. Firstly, we design a pallet loading scheme inspired by the "wall building" theory and propose a route optimization strategy for delivery vehicles considering the constraint of three-dimensional pallet loading. We then formulate a two-objective optimization model that seeks for the highest average vehicle loading rate and the lowest total cost, which substitute the loading efficiency into the time cost. A solution algorithm, called 3DRP (Three-Dimensional Routing with Pallet), is designed, which combines the route optimization strategy with the constraint of three-dimensional pallet loading. To verify the effectiveness of our method, we test it on the LOH & NEE three-dimensional loading example, achieving a loading rate of 68.2%. Moreover, we validate our method using data from an express company in Chongqing, which shows that our method can achieve an average vehicle loading rate of 83.02% with no time penalty costs on some routes. By comparing our proposed method with the traditional 3D loading scheme, we conclude that the optimization of three-dimensional packing of express can balance the high loading rate of vehicles, reduce time and penalty costs by 97.5%, and improve vehicle utilization.

Key words: logistics engineering, path optimization, 3DRP algorithm, vehicle loading rate

摘要: 针对快递码放混乱等问题,本文引入可调节支撑结构高度的托盘作为装卸载体进行配送服务。首先,设计基于“砌墙”理论的托盘装载模式,提出托盘三维装载约束下配送车辆路径优化方案;其次,将装卸效率代入配送时间成本,构建平均车辆装载率最高和总成本最低的双目标优化模型;然后,结合托盘三维装载约束下配送车辆路径优化方案,设计托盘装载路径算法(Three-Dimensional Routing with Pallet, 3DRP),并利用 LN(LOH & NEE) 三维装载算例进行验证,得到68.2%的装载率,验证了其在快递配送问题中的有效性;最后,本文对重庆市某快递公司的配送数据进行实例验证,方案最终结果显示,本文方法可以做到平均车辆装载率83.02%,且部分路径可以做到0时间惩罚成本。通过本文方案与传统三维装载方案的对比分析可知,将托盘作为载体进 行快递三维装箱的优化可以兼顾车辆高装载率,并节约97.5%的时间惩罚成本,提高车辆利用率。

关键词: 物流工程, 路径优化, 托盘装载路径算法, 车辆装载率

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