a. College of Science, Shenyang Aerospace University,Shenyang 110136,China
b. College of Computer Science, Shenyang Aerospace University,Shenyang 110136,China
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文章历史+
Received
Accepted
Published
2023-12-25
Issue Date
2024-04-25
PDF (1664K)
摘要
研究了带时间窗多车场车辆路径问题(multi-depots vehicle routing problem with time windows,MDVRPTW),建立MDVRPTW模型,设计了结合混合高斯模型(Gaussian mixture model,GMM)聚类算法的自适应大邻域搜索(adaptive large neighborhood search,ALNS)算法。通过在邻域变换前将客户集进行分类,优化初始解,提高算法运算效率。算法使用6种不同变换因子,采用得分系统对变换因子进行评价,使算法能够在迭代的不同阶段自适应地选择合适的变换因子。分析了参数设置值的合理性,设计了3组仿真实验,实验结果验证了算法的高效性。
修复因子使用约束内修复因子、无约束修复因子和最差起始修复因子。3种修复因子都以插入后增加的子路径目标函数值为标准,按照轮盘赌方式进行选择重排位置。约束内修复因子在重排客户时需要考虑被插入子路径时车辆能否承载此客户,若不能则选择其他子路径。无约束修复因子指客户点插入时不用考虑是否会超重,若有超重则在此子路径中使用删除因子选定待删除客户并按照约束修复因子重排。最差起始修复因子主要针对多客户删除后的重排顺序。与随机选择不同,其主要按照删除客户的分摊成本Weight i 进行排序,再按从大到小的顺序用轮盘赌进行选择。
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