共查询到20条相似文献,搜索用时 250 毫秒
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偏柔性作业车间调度是生产管理中的重要问题。由于模型和计算的复杂性,传统优化方法往往难以得到最优解。采用改进遗传算法求解偏柔性作业车间的调度问题,设计相应的编码方法,利用所生成的染色体以及通过遗传操作得到的染色体生成可行的调度方案。基于工序串和机器串的编码方法,采用精英解保留策略、轮盘赌选择策略和基于划分集的交叉策略,提出基于均匀分布试验的变异法则,引入贪婪式解码方法对偏柔性作业车间调度进行求解。实例仿真表明,该算法在求解偏柔性作业车间调度方面具有良好的效率和优越性。 相似文献
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目前公司焊接冲压联合车间出现了烟尘多、设备布置拥挤、操作者操作不方便等问题,这些问题严重影响了操作者的身体健康、降低了操作者工作效率、降低了生产设备使用寿命以及零部件的加工精度等。针对这些问题,研究分析了国内外一些汽车行业的焊接、冲压车间布局,并查阅了焊接、冲压车间布局相关资料,对公司焊接冲压联合车间工艺布局合理性进行探讨,并提出合理的工艺布局方案。 相似文献
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针对某企业车间改造的需求,首次提出用模糊聚类方法进行车间布局改造.介绍了模糊聚类在车间布局改造中的详细步骤,并通过一个实例进行验证.改造后车间内部面积使用率提高,物流运输距离明显缩短,符合车间的实际要求,为车间布局改造提供了一种新的方法. 相似文献
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王琦峰 《成组技术与生产现代化》2008,25(1):9-12
针对离散制造企业制造过程管理的特点及对车间信息化的需求,提出了一种面向离散制造业的制造执行系统体系结构,并对体系结构的构成及系统的功能模块进行了分析.在此基础上,对基于Web服务的系统构建技术进行了研究,基于J2EE架构进行了系统开发和应用. 相似文献
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面向过程的制造执行系统的研究 总被引:3,自引:0,他引:3
对制造过度建模技术及面向过程的车间管理和控制方法进行了分析和研究。采用面向对象O-O技术抽象出制造过程中的基本不对象类,并建立了制造过程对象类的关系模型。制造执行系统以制造过程模型为“引擎”,实现面向过程的车间管理和控制,并面向过程将传统车间管理中零散的制造过程、人员、物料、设备、工序工艺和质量等信息通过制造过程这一基本的对象类全面地集成在一起。 相似文献
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针对面向订单生产的离散型制造企业,提出了基于条码技术的离散产品生产数据采集与跟踪方法,并把工作流管理思想引入车间工序控制中,实现工序状态的可视化.定义了产品不同级别的加工状态,建立相应的状态判定算法,并利用采集数据对产品的加工指标进行计算.设计开发了原型系统,并在某企业得到成功应用.应用结果表明,条码运用于离散产品的车间生产跟踪是切实可行的. 相似文献
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Prior research on storage policies and order-picking strategies in order-picking systems has concentrated on studying warehouses with parallel shelves that are separated by horizontal and/or vertical aisles. This paper analyses a special case of an order-picking system where the warehouse is divided into zones with shelves being arranged in the shape of a U in each of the zones. The paper assumes that the shelves of the order-picking system are made up of two rows of stillages that can be flexibly exchanged and that the base of the order-picking process can be moved within the aisle prior to the beginning of the order-picking process. We describe the order-picking system in a formal model and propose different storage location assignment policies whose efficiency is compared in a numerical study. The paper pays special attention to the practical applicability of the model and proposes heuristics that can be easily implemented in practice. 相似文献
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目的 为缓解零售电商商品仓库占地面积广,拣选效率受限等问题。方法 文中就存储策略、指派策略以及路径策略方面对Auto Store仓储系统进行详尽的介绍,在此基础上流程化的分析Auto Store系统完成单次订单拣货作业的业务流程,并运用Anylogic软件对所提出的模型进行仿真和验证。结果 假定订单到达服从Erlang分布,在拣选车和工作站数量和拣选货物数量相同的情况下,对比了Auto Store仓储系统混存布局和传统布局的拣选效率,验证了混存布局的可行性。结论 同时对比基于2种任务指派策略,得出了以基于拣选时间最小化的指派策略下系统运作效率更优这一结论,对理论分析与仿真研究之间的结果进行分析比较,验证了模型的有效性。 相似文献
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Zeqiang Zhang 《国际生产研究杂志》2013,51(15):4220-4223
This paper presents a corrected formulation to the mixed integer programming model of the double-row layout problem (DRLP), first proposed by Chung and Tanchoco (2010, The double row layout problem. International Journal of Production Research, 48 (3), 709–727). In the DRLP, machines are placed along two rows of a corridor, where the objective is to minimise the total cost of material handling for products that move between these machines. We highlight the errors in the original formulation, propose corrections to the formulation, and provide an analytical validation of the corrections. 相似文献
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A mutation operator is critical for the performance of a clonal selection algorithm (CSA) since it diversifies the search directions and avoids early convergence to local optima. This article introduces a CSA approach for the unequal area facility layout problem (UAFLP) with flexible bay structure. A new encoding, the use of mutation types with different combinations, and different static and dynamic mutation application strategies are also proposed. In addition, a guideline in parameter optimization of the CSA is provided. An experimental study is performed on five cases of the UAFLP. It is concluded that the hypermutation types studied in this article, especially the inverse mutation followed by pairwise mutation, can be used to obtain good results within short computation times. 相似文献
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仓储中心的货架摆放布局是影响拣选作业效率的重要因素之一,为研究货架摆放布局对有效存储面积的影响,以鱼骨布局为研究对象,构建其有效存储面积利用率模型,并对其进行仿真验证。结果表明,在鱼骨布局设计的仓库中,主拣选通道角度一定时,拣选通道宽度与货架宽度比例越大,有效存储面积利用率越小;拣选通道宽度与货架宽度比例一定时,主拣选通道角度越趋近于0度或者90度时,有效存储面积利用率越大。由此,鱼骨布局等改进型仓储布局为决策拣选路径提供了新的思路,也从理论上证明了改进型仓储布局实践应用的可行性。 相似文献
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Wai Kin Victor Chan & Charles J. Malmborg 《国际生产研究杂志》2013,51(14):4258-4272
The effectiveness of Monte Carlo simulation relative to intelligent search strategies for solving block layout problems is investigated. For testing purposes, 810 block layout problems are constructed to span a wide range of problem sizes, material flow variation levels, work centre space requirements distributions, and work centre shape distributions. Contrary to preliminary results reported in earlier studies, greedy search and simulated annealing consistently outperform Monte Carlo Simulation across the full range of test problems and sample sizes. This divergence is explained through a comparison based on probabilistic derivations between the proportion of good solutions sampled by the Monte Carlo method and those found by the heuristic search methods. Conditions for the superiority of either method are identified. Therefore, the current study complements earlier studies by providing analytical arguments and additional experimental evidence for the effectiveness of simple Monte Carlo method and intelligent search heuristics on solving layout problems. 相似文献
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A manufacturing facility is a dynamic system that constantly evolves due to changes such as changes in product demands, product designs, or replacement of production equipment. As a result, the dynamic facility layout problem (DFLP) considers these changes and is defined as the problem of assigning departments to locations during a multi-period planning horizon such that the sum of the material handling and re-arrangement costs is minimised. In this paper, three tabu search (TS) heuristics are presented for this problem. The first heuristic is a simple TS heuristic. The second heuristic adds diversification and intensification strategies to the first, and the third heuristic is a probabilistic TS heuristic. To test the performances of the heuristics, two sets of test problems from the literature are used in the analysis. The results show that the second heuristic out-performs the other proposed heuristics and the heuristics available in the literature. 相似文献