不确定环境下低碳物流配送中心选址多目标优化

Multi-objective Optimization of Low Carbon Logistics Distribution Center Location under Uncertain Environment

  • 摘要: 为合理解决低碳物流运输网络系统中的配送中心选址及货物分配问题,首先,通过模糊变量及正态分布描述货物供需的不确定性,并采用综合油耗模型量化运输配送过程中的碳排放,提出覆盖集聚指数以反映物流配送中心物理位置分布的均衡性,进而构建不确定环境下多目标低碳物流配送中心选址优化模型;其次,考虑NSGA-Ⅱ算法在求解该类问题时求解精度较低和Pareto前沿分布不均匀的缺点,利用混沌Tent映射改善初始解在解空间分布的均匀性,并引入免疫选择算子以提高算法搜索能力,提出非支配排序免疫算法;最后,通过虚拟算例验证了模型和算法的有效性,研究结果表明:构建的模型可对决策者在不同的背景下选择合理的选址方案提供参考,提出的算法在求解该类问题中表现出较好的性能。

     

    Abstract: In order to reasonably solve the problem of distribution centre location and freight distribution in low-carbon logistics and transportation network system, firstly, the uncertainty of freight supply and demand is described through fuzzy variables and normal distribution, the comprehensive fuel consumption model is used to quantify the carbon emission in the process of transportation and distribution, and the Con-centration Index of Cover is proposed to reflect the balance of physical location distribution of logistics and distribution centre, Then, a multi-objective low-carbon logistics distribution centre location optimization model under uncertain environment is constructed; Secondly, considering the shortcomings of NSGA-Ⅱ algorithm in solving this kind of problems, such as low accuracy and uneven distribution of Pareto front, chaotic tent map is used to improve the uniformity of initial solution distribution in solution space, immune selection operator is introduced to improve the search ability of the algorithm, and a non-dominated sorting immune algorithm is proposed.Finally, the effectiveness of the model and algorithm was verified through a virtual example.The research results indicate that the constructed model can provide reference for decision-makers to choose reasonable location schemes in different backgrounds, and the proposed algorithm performs better in solving such problems.

     

/

返回文章
返回