共查询到20条相似文献,搜索用时 46 毫秒
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目的 提高大规模定制化按单生产应用场景下桁架机械手分拣码垛下线成品的作业效率.方法 提出一种基于分布重心法的播种区货位分配法,针对分拣码垛桁架机械手系统的工作特点,建立设备分拣任务总时间数学模型,将其归结为以最小桁架机械手带载水平移动总时间为目标的播种区货位分配问题.根据待拣订单货品的初始数量和位置,构建订单-货品分布重心矩阵.在此基础上,依据分布重心系数由大到小的顺序对播种区内的货位进行订单分配.结果 与货位随机分配法相比,采用分布重心法可以将桁架机械手带载水平移动时间平均缩短约28.14%,分拣任务总时间平均缩短约5.78%.结论 通过货位分配的优化,有效缩短了桁架机械手完成分拣任务的时间,提高了系统分拣效率. 相似文献
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基于几何法的3-PCR平移并联分拣机器人工作空间研究 总被引:2,自引:2,他引:0
利用几何法,对3-PCR并联机器人运动学方程进行了分析。选取了一定的参数,在三维软件INVENT-OR里绘制出了相应的工作空间,通过分析单独支链的工作空间,最后确定了工作空间的包络面及包络线,并分析了该机构工作空间内的奇异性。 相似文献
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货架资源的紧缺性使货架空间分配问题成为零售市场中被重点关注的领域。本文在二维货架空间分配模型的基础上,考虑了产品空间邻接关系的影响,建立了混合整数非线性规划模型,并设计了改进型随机密钥遗传算法进行求解,最后使用多个算例进行了广泛验证。在小规模问题中,通过本文设计算法、基准遗传算法和Lingo求解结果比较,发现本文设计算法相对于Lingo在求解效率上有很大提升。在大规模问题中,通过本文设计算法和基准遗传算法比较,发现在收敛时间相近的情况下,本文算法效果更好。通过对加入空间邻接关系效应与否进行对比分析,发现在考虑该效应的情境下,所有算例的利润值都有所提升,并且随着上架产品种类数增多,利润及其增量呈现先增后减的趋势。 相似文献
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目的我国传统的食品生产行业,以人工分拣为主,自动化程度低,需耗费大量的劳动力,设计一种3-CUR并联机器人,用于食品生产的快速分拣。方法运用螺旋理论分析了该机构的自由度数目和类型,并且用修正的Grubler-Kutzbach公式对该机构的自由度进行了验证。接着使用D-H运动链参数表示法和欧拉角表示法,求解该机构的位置反解,采用三维动态法和Matlab软件对该并联分拣机器人的工作空间进行了分析与仿真,最后利用ADAMS软件对该机器人的运动性能进行了仿真分析。结果该机构可以实现一平(沿z轴的平动)两转(绕x轴y轴的转动)的运动,工作空间大,可达范围广,没有出现奇异点,末端执行器各参数的运动曲线呈有规律的周期性变化,可满足分拣机器人所需的运动和工作范围。结论该机构运动性能优越,稳定性好,具有良好的工作空间,可实现食品生产过程中的高速自动扫描和分拣,在包装自动化领域具有潜在的应用价值。 相似文献
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鉴于已有模糊区域关系模型研究工作主要是针对二维空间中模糊区域间的拓扑关系,没有涉及三维立体空间中处于不同平面上的Vague区域间的不确定的拓扑关系,为了处理立体空间中复杂的Vague区域关系,基于Vague集对立体空间中的含核Vague区域之间的空间关系进行了详细的研究,给出了处于不同平面中的含核Vague区域关系的42种交集模型,进一步研究了处于同一平面和不同平面上的含核Vague区域关系的旋转对应性.研究成果可用于对立体空间中的含核Vague区域关系进行统一建模和数学分析,能较好地解决立体空间中的含核Vague区域关系的表示和分析问题. 相似文献
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This paper reexamines the order picking process in a warehouse facing the challenges that e-commerce brings about and which are characterised by a very large number of small sized orders and returns. Implementing effective storage assignment strategies combined with efficient batching, in this context, is very fundamental to keep the warehouse’s responsiveness and order completion times up to the standards. This paper investigates a new storage assignment strategy, initially implemented by a large shoes and footwear wholesaler, to enhance the performance of the order picking process in its warehouses. The impact of this new storage assignment strategy on the performance of the order picking process is analysed via simulation. The performance of the system, measured in terms of total picking time as well as order lead time while taking congestion into account, is compared to the cases where conventional storage assignment strategies are implemented. A full factorial design is set up and the simulation output is statistically analysed. The results of this analysis are reported and thoroughly discussed. Attending to the results, the proposed strategy presents a remarkable potential to shorten total picking travel distances and order completion time and consequently customer satisfaction. 相似文献
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通过介绍物流配送中心的概念、功能,分析阐述了物流配送中心的外部规划,包括选址、规模的设计,内部作业流程的规划以及信息系统的规划,确定其具体规划流程.最后基于物流配送中心基本构成要素,为物流配送中心管理提出了一些方法和措施. 相似文献
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This paper deals with a correlated storage location assignment problem by considering the production bill of material (BOM) information. Due to the large number of parts in a BOM, the picking capacity constraint is considered. A mathematical model is formulated and a multi-stage heuristic is proposed. The heuristic relaxes the close interrelationships within the original problem through an improvement algorithm and an iterated approach to incorporate the effect of BOM splitting. In order to evaluate the performance of the heuristic, numerical experimentation is conducted in a single-block-multi-aisles warehouse, by using a randomly generated data set. 相似文献
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目的 构建英式拍卖模型,以待指派商品品项(SKU)群的最低周转率为媒介,通过逐步提升最低周转率来实现待指派SKU与待指派区域货位数量的匹配。方法 针对移动机器人拣货系统(RMFS)中的货位指派,提出基于英式拍卖机制的货位指派方法,提升仓库拣货效率。结果 与随机指派相比,在不同仓库规模、订单规模、订单偏度的RMFS中采用英式拍卖货位指派机制,机器人行走路程下降比率在大型仓库中达30.17%,中型仓库的下降比率为27.31%,小型仓库的下降比率为24.13%。结论 采用英式拍卖机制在RFMS中进行货位指派可大幅度提高工作效率。 相似文献
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目的研究零售连锁企业区域配送中心分区拣选系统下的储位优化方法。方法以某药品连锁零售企业区域配送中心为研究对象,将不同分区的拣选时间趋于均衡作为储位优化目标,结合样本订单与历史订单的特点,建立储位优化数学模型,并采用遗传算法进行求解,以获取约束条件内该模型的最优解。结果在样本订单占80%权重的前提下,将所求得的分区与储位的解所对应的拣选时间,与研究对象的拣选现状进行对比,发现采用均衡各区拣选时间模型的求解结果提高了37.34%的效率,优化效果显著。结论实证研究证明了该模型和算法的有效性,该优化方法也广泛适用于其他分区拣选系统的储位分配作业。 相似文献
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This paper presents an integrated storage assignment method for low-level picker-to-parts order picking warehouses taking into account economic and ergonomic objectives. Three different pallet rack layouts are studied in this paper, namely (a) picking from full pallets on the floor, (b) picking from half-pallets on the floor, and (c) picking from half-pallets on the upper rank of the shelf. First, cost functions are developed to assess the total order picking performance impact of these different pallet rack layouts. Second, with regard to workload, the metabolic cost and energy expenditure rates for picking from the different rack layouts under study are derived. Third, for assessing the working posture during order picking, the Ovako Working Posture Analysing System index is used where the required data is collected using a motion capturing system. The developed models are combined to propose a heuristic storage assignment procedure that supports the decision of which item to store on which pallet. The developed storage assignment method is then applied to an industrial case study. The results of the paper support warehouse managers in assessing the order picking storage assignment from an ergonomics viewpoint and in estimating its impact on financial order picking performance. 相似文献
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介绍了一种针对大型冷库、速冻设备、低温物流配送中心及超级购物中心的并联压缩制冷技术,并对其在中国地区的应用现状和发展趋势进行了比较详细的阐述。 相似文献
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Smart warehouse automation has emerged as an effective, competitive solution for suppliers and distributors. With the increasing demand for physical storage and distribution services, suppliers and service providers are challenged to respond not only effectively, but with minimal latency. Differentiated service levels for different classes of customer orders have not yet, however, been developed for physical storage and retrieval. In this paper, in the context of smart warehouse automation services, a novel policy, called Differentiated Probabilistic Queuing (DPQ) is developed for servicing customers’ orders by Automated Guided Vehicles (AGV). Applying the DPQ policy, the average overall latency of each customer order, the mean overall processing time of this customer’s orders in the smart warehouse automation system, is characterised under Poisson customer order arrival patterns. The weighted average latency of all customer orders is optimised over the choice of (1) storage assignment and (2) DPQ policy. Due to the existence of two types of variables, Alternating Minimisation method is applied to solve this joint optimisation problem. Compared with a combination of the classical turn-over rate storage assignment method and FCFS policy, the new approach yields 19.64% lower (better) objective function value with statistical significance. Numerical analysis results also indicate, as expected, that when the smart warehouse system resources become more limited, and the price difference among different classes of customer orders increases, the improvement becomes even more significant. 相似文献
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Pyung-Hoi Koo 《OR Spectrum》2009,31(4):759-774
As the transactions through electronic commerce and TV home shopping increase, the warehouses often receive a large amount
of small orders to be picked within tight time windows. One of the important warehousing activities is order picking, the
process of retrieving a number of items from warehouse storage to meet a number of independent customer orders. This paper
examines a new order picking method, bucket brigade order picking (BB picking). Bucket brigade is a way of coordinating workers
who progressively perform a set of operations on a flow line. In the BB picking system, a worker performs operations on an
order until the next worker downstream takes it over; then goes back to the previous worker upstream to take over a new order.
We discuss distinct characteristics in order picking systems when bucket brigades are applied. We identify some efficiency
losses under the BB picking and present a new BB picking protocol to improve the performance of order picking systems. The
new BB picking is compared with the existing BB picking and zone picking through simulation experiments. 相似文献
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对基于工作量均衡的分区同步拣货系统储位分配模型中的相似系数进行了重新定义,根据被拣货物具有一定质量和体积的实际,在充分考虑品项实际订购数量的前提下,提出了当量订购次数的概念和计算公式。为检验储位分配效果,提出了系统利用率评价函数。算例结果及分析表明,修改后的模型更符合实际,有助于决策者根据不同情况作出正确决策。 相似文献