多层配送中心论文：多层配送中心产品布局优化及仿真.doc

多层配送中心论文：多层配送中心产品布局优化及仿真【中文摘要】随着我国土地资源日益紧缺,土地价格日益上涨,为了满足客户企业日益增长的储存和配送需求,建设多层配送中心成为了物流企业的重要举措。与单层配送中心一样,产品布局优化也是多层配送中心管理的重要内容,合理的产品布局方案将有利于缩短出入库搬运时间,降低储存、分拣和补货等成本。因此研究多层配送中心产品布局优化问题对于提高订单处理效率,改善客户服务水平,降低多层配送中心成本具有重要的理论和现实意义。本文在总结分析配送中心产品布局相关理论及研究的基础上,综合应用概率论、运筹学、计算机仿真和算法设计理论,以多层配送中心为研究对象,深入分析了其产品布局优化问题,建立了电梯仿真模型和产品布局优化理论模型,并对传统遗传算法进行了改良。首先,在电梯容量有限的前提下,从产品随机到达的角度出发,基于优先响应高层呼叫的原则,利用AutoMod软件的车辆路径系统模拟了4层配送中心的电梯运行过程,得到了各层产品的平均等待时间,并分析了电梯容量变化对仿真结果的影响。其次,在AutoMod仿真的基础上,综合考虑垂直方向产品平均等待时间、水平方向搬运时间、产品相关性、产品周转率因素,以“总时间最短、总相关性最大“为目标,以产品同一性原则和空间限制为约束,构建了多层配送中心产品布局优化理论模型。再次,为了求解产品布局优化理论模型,得到最优的多层配送中心产品布局方案,在传统遗传算法的基础上,利用权重系数变化法构造了适应度函数,改良了选择算子、交叉算子和变异算子。最后,以XX多层配送中心为例,运用本文提出的方法进行了产品布局优化,验证了电梯仿真模型、产品布局优化理论模型和算法的有效性。【英文摘要】With the increasing scarcity of land resources and the rising of land prices, in order to meet growing of enterprise customer demand for the storage and distribution, construction of the multi-level distribution center become the important measure of logistics enterprises. Like Single distribution center, the layout optimization is also the important content of the multi-level distribution center, reasonable product layout will help shortening the storage handling time, reducing storage, picking and replenishment and other costs. Therefore, the research of multi-level distribution center product layout optimization has important theoretical and practical significance for improving order processing efficiency, improving customer service levels, reducing the cost of multiple distribution centers. Basing on summarizeing and analysing the products layout theory and research of distribution centers, integrated application of probability theory, operations research, computer simulation and algorithm design theory, this paper considers multi-level distribution center as the study object, in-depth analyse of the product layout optimization problem, establish the elevator simulation model and product layout optimization model, and improve the traditional genetic algorithm.First of all, the premise of limited capacity in the elevator, from the perspective of products were reached, based on the principle of priority in response to high-level calling, the paper used AutoMod softwares vehicle system to simulate elevator operation in a 4-layer distribution center, got the average waiting time of each layer of products, and analyzed the changes in the lift capacity what impact on the simulation results. Secondly, based on AutoMod simulation, considering the average waiting time, movement time of vertical and horizontal direction, product-related, product turnover and so on, construct multi-distribution center product layout optimization model, what is “the shortest time, the most relevant” as the goal, the product identity and space limit as the constraints. Thirdly, in order to solve the product layout optimization model, and get the optimal product layout of multi-layer distribution center, based on the traditional genetic algorithm, used the weight coefficient to construct the fitness function, improved the selection operator, crossover operator and mutation operator. Finally, the paper used an example of the XX multiple distribution centers to verify the simulation model of the elevator, the product layout optimization model and algorithm.【关键词】多层配送中心 产品布局优化 遗传算法 电梯系统 仿真【英文关键词】Multi-level distribution center Product layout optimization Genetic algorithm Elevator system Simulation【目录】多层配送中心产品布局优化及仿真摘要6-7Abstract7-8第1章 绪论11-201.1 研究背景及主要意义11-131.1.1 研究背景11-121.1.2 主要研究意义12-131.2 配送中心产品布局研究综述13-181.2.1 配送中心产品布局的研究现状13-171.2.2 研究不足之处17-181.3 研究方法及技术路线18-191.4 研究内容19-20第2章 相关理论综述20-302.1 配送中心概述20-252.1.1 配送中心的概念20-212.1.2 配送中心的分类21-232.1.3 配送中心的功能23-252.2 产品布局概述25-292.2.1 产品布局的目标25-262.2.2 产品布局原则26-272.2.3 产品布局方法27-292.3 本章小结29-30第3章 多层配送中心产品布局优化问题研究30-473.1 产品布局优化模型的建立30-353.1.1 模型假设及变量说明31-333.1.2 模型目标函数33-343.1.3 产品布局优化模型34-353.2 基于AutoMod的电梯仿真模型35-463.2.1 AutoMod概述36-393.2.2 仿真模型的建立39-423.2.3 运行结果分析42-463.3