Location-routing optimization for joint land-sea emergency delivery to large islands
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摘要: 综合考虑物资优先级、船队异质性及集结港与船舶的人员/物资容量等现实因素,构建了以集结港选址、运输船舶航次和航线配置为变量,以投送时间最短为目标的选址-路径优化模型;提出了一种集成优化算法,以自适应大邻域搜索算法为框架构成外层优化循环,通过嵌套改进模拟退火算法形成内部优化模块,并通过内外层交互机制实现全局与局部搜索的融合;为验证模型与算法的有效性,以向中国南海地区应急投送为例进行实证研究。研究结果表明:优化后投送时间由78.52 h缩短至48.03 h,较现有算法效率提升6.54%~48.51%,稳定性提高10.77%~72.92%;进一步敏感性分析发现,船舶容量、速度、集结港数量和陆上运输平均速度均与系统投送时间负相关,而投送人员与物资数量和登陆港数量均与系统投送时间正相关,边际贡献递减,小容量、低速船舶的部署会显著削弱系统性能。所提算法能有效平衡多货种优先级冲突与异质运输资源限制,可为陆海联合跨海应急投送提供兼具时效性与鲁棒性的决策支持,对特殊场景下的选址-路径问题研究具有理论拓展价值。Abstract: Considering some real-world factors, such as material priority, fleet heterogeneity, and the personnel/material capacities of assembly ports and vessels, a location-routing optimization model was constructed. This model employed assembly port location, vessel voyage scheduling, and route configuration as variables, aiming to minimize delivery time. An integrated optimization algorithm was proposed. It leveraged an adaptive large neighborhood search algorithm as the framework for the outer-layer optimization loop. An improved simulated annealing algorithm was embedded as the inner-layer optimization module. The integration of global and local search was achieved through an interaction mechanism between the inner and outer layers. The effectiveness of the proposed model and algorithm was validated through an empirical case study of emergency delivery to China's South China Sea region. Research results show that the optimized delivery time is reduced from 78.52 h to 48.03 h, showing an efficiency improvement of 6.54%-48.51% and a stability enhancement of 10.77%-72.92% in comparison with existing algorithms. Further sensitivity analysis reveals that vessel capacity, speed, the number of assembly ports, and the average speed of ground transportation are all negatively correlated with delivery time of the system, while delivery personnel and material quantities, the number of landing ports are all positively correlated with delivery time of the system, exhibiting diminishing marginal effects. Deploying small or slow vessels can significantly undermine system performance. The proposed algorithm has the capability of effectively balancing material priority conflicts and heterogeneous transportation resource constraints. It provides timely and robust decision support for joint land-sea emergency delivery, and offers theoretical implications for extending the research on location-routing problems in special scenarios.
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表 1 船舶容量
Table 1. Ship loading capacity
船舶编号 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# 载人量/人 4 000 3 800 3 600 3 400 3 500 3 200 2 800 2 600 2 400 2 200 载货量/t 3 600 3 400 3 200 3 000 3 000 2 800 2 600 2 400 2 200 2 000 表 2 各保障基地人员与物资数量
Table 2. Numbers of personnel and materials at each support base
保障基地 广州 茂名 韶关 云浮 湛江 南宁 桂林 玉林 百色 钦州 人员数 2 500 0 0 0 0 2 500 4 000 0 0 0 第1类物资/t 2 000 0 0 0 0 4 000 3 200 0 0 0 第2类物资/t 0 1 200 1 200 0 0 0 0 2 000 1 000 2 000 第3类物资/t 0 0 0 600 600 0 0 0 0 0 保障基地 贵阳 毕节 遵义 铜仁 六盘水 长沙 邵阳 衡阳 怀化 永州 人员数 0 0 6 000 0 6 000 0 0 0 0 4 000 第1类物资/t 0 0 4 800 0 4 800 0 0 0 0 3 200 第2类物资/t 0 0 0 0 0 1 500 2 000 0 1 500 0 第3类物资/t 1 000 1 500 0 1 000 0 0 0 1 500 0 0 表 3 各登陆港人员与物资需求数量
Table 3. Numbers of personnel and materials at each landing port
登陆港 海口港 洋浦港 龙湾港 三亚港 人员数 8 500 6 500 6 000 4 000 第1类物资/t 6 800 5 400 4 800 3 000 第2类物资/t 4 200 3 200 3 000 2 000 第3类物资/t 2 100 1 600 1 500 1 000 表 4 各保障基地至集结港距离
Table 4. Distances from each support base to the assembly port
km 保障基地 广州港 茂名港 海安新港 北海港 防城港 广州 82 316 546 550 641 茂名 350 46 220 234 327 韶关 289 510 724 716 792 云浮 200 226 439 423 503 湛江 430 109 138 179 272 南宁 607 414 431 222 148 桂林 536 532 643 517 514 玉林 420 203 295 196 275 百色 831 638 644 434 361 钦州 615 315 321 112 56 贵阳 985 908 970 761 687 毕节 1 161 1 084 1 146 936 863 遵义 1 118 1 039 1 101 892 818 铜仁 927 947 1 035 875 845 六盘水 1 208 1 106 1 111 902 828 长沙 733 919 1 094 1 005 998 邵阳 635 746 915 795 786 衡阳 576 755 927 836 829 怀化 811 856 966 809 779 永州 543 650 820 728 723 表 5 各港之间距离
Table 5. Distances between ports
n mile 港口 广州港 茂名港 海安新港 北海港 防城港 海口港 洋浦港 龙湾港 三亚港 广州港 0 170 255 362 398 258 320 269 331 茂名港 170 0 97 192 238 103 164 142 240 海安新港 255 97 0 103 140 15 79 100 200 北海港 362 192 103 0 46 109 102 201 231 防城港 398 238 140 46 0 145 123 236 239 海口港 258 103 15 109 145 0 66 99 193 洋浦港 320 164 79 102 123 66 0 171 142 龙湾港 269 142 100 201 236 99 171 0 104 三亚港 331 240 200 231 239 193 142 104 0 表 6 第1航次船舶海上运输方案
Table 6. Maritime transportation plan of vessels for the 1st voyage
船舶编号 航线 港口作业说明 1# 防城港→洋浦港 防城港装载4 000人、3 600 t第1类物资;洋浦港卸载4 000人、3 600 t第1类物资 2# 防城港→洋浦港→海口港 防城港装载3 800人、3 400 t第1类物资;洋浦港卸载2 500人、1 800 t第1类物资;海口港卸载1 300人、1 600 t第1类物资 3# 防城港→海安新港→海口港 防城港装载1 200人、200 t第1类物资;海安新港装载2 400人、3 000 t第1类物资;海口港卸载3 600人、3 200 t第1类物资 4# 北海港→海安新港→海口港→龙湾港 北海港装载3 400人、1 800 t第1类物资;海安新港装载1 200 t第1类物资;海口港卸载3 400人、2 000 t第1类物资;龙湾港卸载1 000 t第1类物资 5# 北海港→海安新港→海口港→龙湾港 北海港装载200人;海安新港装载3 300人、3 000 t第1类物资;海口港卸载200人;龙湾港卸载3 300人、3 000 t第1类物资 6# 海安新港→龙湾港→三亚港 海安新港装载3 200人、2 800 t第1类物资;龙湾港卸载2 700人、800 t第1类物资;三亚港卸载500人、2 000 t第1类物资 7# 北海港→海安新港→洋浦港→三亚港 北海港装载1 500 t第2类物资;海安新港装载2 800人、1 000 t第1类物资和100 t第2类物资;洋浦港卸载1 600 t第2类物资;三亚港卸载2 800人、1 000 t第1类物资 8# 海安新港→洋浦港→海口港→三亚港 海安新港装载700人、2 400 t第2类物资;洋浦港卸载1 600 t第2类物资;海口港卸载800 t第2类物资;三亚港卸载700人 9# 海安新港→海口港 海安新港装载2 200 t第2类物资;海口港卸载2 200 t第2类物资 10# 海安新港→茂名港→海口港→龙湾港 海安新港装载1 500 t第2类物资;茂名港装载500 t第2类物资;海口港卸载1 200 t第2类物资;龙湾港卸载800 t第2类物资 表 7 第2航次船舶海上运输方案
Table 7. Maritime transportation plan of vessels for the 2nd voyage
船舶编号 航线 港口作业说明 1# 洋浦港→茂名港→洋浦港→三亚港 洋浦港返回茂名港;茂名港装载2 000 t第2类物资、1 600 t第3类物资;洋浦港卸载1 600 t第3类物资;三亚港卸载2 000 t第2类物资 2# 茂名港→龙湾港→三亚港 茂名港装载1 400 t第3类物资;龙湾港卸载400 t第3类物资;三亚港卸载1 000 t第3类物资 3# 茂名港→海口港→龙湾港 茂名港装载3 200 t第3类物资;海口港卸载2 100 t第3类物资;龙湾港卸载1 100 t第3类物资 9# 茂名港→龙湾港 茂名港装载2 200 t第2类物资;龙湾港卸载2 200 t第2类物资 表 8 算法结果对比
Table 8. Comparison of algorithm results
算法 性能指标 y=0.5 y=1 y=2 y=3 y=4 y=5 本文算法 平均时间/s 58.10 153.72 391.88 843.92 1 459.49 1 602.14 平均结果/h 46.13 48.95 75.17 96.42 120.94 142.55 平均结果的标准差/h 0.26 0.13 0.24 0.18 0.36 0.58 GA 平均时间/s 83.26 182.45 532.08 1 061.94 1 739.24 1 848.13 平均结果/h 49.36 52.40 81.58 106.26 137.17 167.72 平均结果的标准差/h 0.34 0.42 0.31 0.27 0.52 0.70 SA 平均时间/s 73.48 169.02 457.06 975.97 1 647.71 1 779.36 平均结果/h 51.15 53.62 82.67 105.49 133.47 159.80 平均结果的标准差/h 0.37 0.27 0.61 0.29 0.46 0.65 RL 平均时间/s 112.83 221.54 603.74 1 231.45 1 987.62 2 110.73 平均结果/h 50.92 54.17 83.22 107.46 138.81 164.73 平均结果的标准差/h 0.51 0.48 0.73 0.61 0.79 0.92 DE 平均时间/s 90.75 190.12 545.33 1 092.54 1 780.83 1 892.45 平均结果/h 48.26 51.38 79.74 104.18 132.92 156.81 平均结果的标准差/h 0.28 0.30 0.26 0.22 0.39 0.67 表 9 算法改进率对比
Table 9. Comparison of algorithm improvement rates
% 指标类别 比较指标 y=0.5 y=1 y=2 y=3 y=4 y=5 运行时间 本文算法与GA相比改进率 30.22 15.75 26.35 20.53 16.08 13.31 本文算法与SA相比改进率 20.93 9.05 14.26 13.53 11.42 9.96 本文算法与RL相比改进率 48.51 30.61 35.09 31.47 26.57 24.10 本文算法与DE相比改进率 35.98 19.15 28.14 22.76 18.04 15.34 优化结果 本文算法与GA相比改进率 6.54 6.58 7.86 9.26 11.83 15.01 本文算法与SA相比改进率 9.81 8.71 9.07 8.60 9.39 10.79 本文算法与RL相比改进率 9.41 9.64 9.67 10.27 12.87 13.46 本文算法与DE相比改进率 4.41 4.73 5.73 7.45 9.01 9.09 稳定性 本文算法与GA相比改进率 23.53 69.05 22.58 33.33 30.77 17.14 本文算法与SA相比改进率 29.73 51.85 60.66 37.93 21.74 10.77 本文算法与RL相比改进率 49.02 72.92 67.12 70.49 54.43 36.96 本文算法与DE相比改进率 7.14 56.67 7.69 18.18 7.69 13.43 表 10 不同置信度水平与方差下的模型结果
Table 10. Model result under different confidence levels and variances
置信度水平α 方差σ2 投送时间/h 需求满足比例/% 运行时间/s 0.80 0.10 56.3 86.4 144.5 0.15 58.5 85.1 144.9 0.20 59.4 84.4 146.3 0.85 0.10 57.4 86.7 144.1 0.15 58.2 84.7 143.9 0.20 58.8 83.9 148.7 0.90 0.10 57.2 86.6 148.2 0.15 58.4 86.1 145.6 0.20 59.2 84.9 147.8 -
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