仓储系统中分拣—存取效率优化模型与策略研究

发布时间：2018-02-21 01:54

本文关键词： 仓储系统分拣系统平台分离的自动存取系统行走时间模型打包策略待命位点策略　出处：《华中科技大学》2016年博士论文　论文类型：学位论文

【摘要】：仓储系统是现代供应链的一个重要组成部分,是决定企业成败的关键角色。为了适应供应链中的各种可变性,仓储系统暂时地存储产品和半成品。许多因素可能造成供应链的可变性,例如,来自不同供应商的产品或者半成品的整合；产品的季节性；类似贴标签、重新包装和产品定制化等额外增值服务。在决定供应链的物流配送网络的效率时,仓储系统的绩效是一个至关重要的因素。影响仓储系统的绩效的因素有很多,包括订单分拣,存取操作,仓库的设计,仓库的布局和分区等。本文主要研究了打包分拣和存取操作这两个因素对仓储系统绩效的影响。首先,研究了分拣系统的订单打包问题。建立了可变时间窗打包背景下的订单产出时间模型,并分析了可变时间窗背景下,订单打包对订单期望产出时间的影响。另外,采用灵敏度分析的方法分析了分拣巷道的数量,订单的期望间隔到达时间,分拣巷道的长度和低层存储货位的百分比这四个因素对打包批次和订单期望产出时间的影响。然后,研究了平台分离的自动存取系统在I/O待命位点策略下的两个优化问题。在第一个优化问题中,首先提出了平台分离的自动存取系统在I/O待命位点策略下的双指令循环行走时间模型,然后使用计算机仿真验证了这个双指令循环行走时间模型的精确性。并比较了本文提出的双指令循环行走时间模型和前人提出的单指令循环行走时间模型,实验结果表明,双指令循环操作模式比单指令循环操作模式可以获得更小的期望行走时间。在第二个优化问题中,本文首先分别建立了平台分离的自动存取系统在I/0待命位点策略下考虑一个货架和考虑两个货架的双指令循环优化行走时间模型,在建立了这两个双指令循环优化行走时间模型之后,使用凸优化的方法分析了这两个优化行走时间模型在不同情形下的绩效。最后分别使用计算机仿真和比较性实验验证了提出来的两个双指令循环优化行走时间模型的精确性和有效性。最后,研究了平台分离的自动存取系统在停留在原地的待命位点策略下的优化问题。本文首先建立了平台分离的自动存取系统在停留在原地的待命位点策略下的双指令循环行走时间模型,然后使用计算机仿真验证了双指令循环行走时间模型的精确性。并将本文建立的双指令循环行走时间模型和前人研究的单指令循环行走时间模型进行了比较,验证了本文提出的双指令循环行走时间模型的有效性。
[Abstract]:Storage system is an important part of modern supply chain and a key role to determine the success or failure of enterprises. Storage systems temporarily store products and semi-finished products. Many factors may contribute to the variability of the supply chain, for example, integration of products or semi-finished products from different suppliers; seasonality of products; similar labelling, Additional value-added services such as repackaging and product customization. The performance of the warehousing system is a critical factor in determining the efficiency of the logistics and distribution network in the supply chain. There are many factors that affect the performance of the warehousing system, including order sorting, Access operation, warehouse design, warehouse layout and partition. This paper mainly studies the impact of packaging and sorting and access operation on the performance of storage system. This paper studies the order packing problem in the sorting system, establishes the order output time model under the variable time window packaging background, and analyzes the influence of the order packing on the order expected output time under the variable time window background. The effects of four factors, such as the number of sorting roadways, the expected arrival time of order interval, the length of sorting roadway and the percentage of lower storage space, on the packing lot and the expected output time of the order are analyzed by using sensitivity analysis method. In this paper, two optimization problems of platform-separated automatic access system under I / O standby locus strategy are studied. In the first optimization problem, First of all, a dual instruction cycle walking time model of platform separated automatic access system under I / O standby locus strategy is proposed. Then computer simulation is used to verify the accuracy of this model, and the proposed model is compared with the single instruction cycle walking time model proposed in this paper. The experimental results show that, The dual instruction loop mode can achieve a smaller expected walking time than the single instruction loop operation mode. In the second optimization problem, In this paper, we first establish a dual instruction cycle optimal walking time model for platform-separated automatic access systems considering one shelf and two shelves under the I / 0 standby locus strategy, respectively. After the establishment of the two double instruction loop optimization walking time models, The performance of the two optimal walking time models under different conditions is analyzed by using convex optimization method. Finally, the proposed two double instruction cycle optimization models are verified by computer simulation and comparative experiments, respectively. The accuracy and effectiveness of the. Finally, In this paper, we study the optimization of platform-separated automatic access system under standing in situ standby locus strategy. In this paper, we first establish the dual instructions of platform-separated automatic access system under standing in situ standby locus strategy. Cycle walking time model, Then the accuracy of the double-instruction cycle walking time model is verified by computer simulation, and the two-instruction cycle walking time model established in this paper is compared with the single instruction cycle walking time model. The validity of the dual instruction cycle walking time model proposed in this paper is verified.
【学位授予单位】：华中科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：F252.1

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