共查询到19条相似文献,搜索用时 187 毫秒
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为避免单元系统布局和单元内设施布局分开孤立研究所导致的问题解空间损失,利用并行工程的思想对单元布局的两个环节集成考虑,对单元系统布局、单元内设施布置、设施摆放方向进行同时描述,并建立多目标集成优化模型。针对模型的复杂性,设计了改进粒子群算法,算法吸收了遗传算法中的交叉操作算子,具有跳出局部最优解的能力。最后通过求解单元设施布置实例,验证模型和算法的有效性。 相似文献
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《工业工程与管理》2015,(4)
产品保证售后服务的效率对于消费者的购买决定起到至关重要的作用。而采取良好的维修布局方式不仅能为消费者提供充分的售后维修服务,还能为企业有效降低维修设施布局的成本。就此问题,基于相关文献的研究,提出了产品保证下维修站点的层级布局模型。该模型结合设施布局的模型以及LORA的分析方法,并考虑了符合实际情况的转运因素等对设施进行合理的布局。针对该模型属于NP-hard问题,文章采用了模拟退火改进后的遗传算法对此问题进行求解,并在随机的算例下得出设施布局的满意结果以及每级别设施所配备的设备和资源。文章提出的模型及其算法具有可行性和一般性,可为产品保证下维修站点的层级布局方式提供依据,具有一定的实际意义。 相似文献
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彭运芳范凌志曾甜韩亚娟 《工业工程与管理》2018,(4):30-35
当前市场竞争越发激烈,设施布局的动态调整对于企业节约生产成本十分重要,但现有绝大部分动态布局优化模型并未考虑设施大小对动态布局的影响。为解决此问题,在经典动态布局优化模型的基础上,考虑设施不等尺寸以及物料输送系统类型建立数学模型。通过设计改进型自适应遗传算法对实际算例求解,从而为企业的设施布局优化提供决策依据,进一步降低生产成本。 相似文献
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目的为飞机客舱布局及设施造型PSS设计提供一种可行的研究思路与方法。方法以宽体客机乘务员休息区域布局及设施造型案例为研究对象,进行实例验证研究。结论客舱设施造型的PSS设计不再是单一解决形态、色彩、材质、结构等基本要素问题,无形的服务质量也作为设计的重要因素,解决PSS中使用者的安全、高效、舒适、美观以及人机匹配最优化的问题。 相似文献
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针对轴类零件工艺平面布置随机性强的问题,提出用矩阵来描述其布置和设计,解决了工艺平面布置决策支持系统(DSS)中信息描述困难这一关键问题。决策过程中,输入本企业当前有关数据,通过人机协调和动态管理,使决策更加切合企业实际情况从而避免投资浪费和风险。该系统(DSS)为制造企业技术改造投资、工艺平面布置设计和决策提供了有力的帮助。 相似文献
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Determining the locations of departments or machines in a shop floor is classified as a facility layout problem. This article studies unequal-area stochastic facility layout problems where the shapes of departments are fixed during the iteration of an algorithm and the product demands are stochastic with a known variance and expected value. These problems are non-deterministic polynomial-time hard and very complex, thus meta-heuristic algorithms and evolution strategies are needed to solve them. In this paper, an improved covariance matrix adaptation evolution strategy (CMA ES) was developed and its results were compared with those of two improved meta-heuristic algorithms (i.e. improved particle swarm optimisation [PSO] and genetic algorithm [GA]). In the three proposed algorithms, the swapping method and two local search techniques which altered the positions of departments were used to avoid local optima and to improve the quality of solutions for the problems. A real case and two problem instances were introduced to test the proposed algorithms. The results showed that the proposed CMA ES has found better layouts in contrast to the proposed PSO and GA. 相似文献
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This paper addresses the reconfigurable layout problem, which differs from traditional, robust and dynamic layout problems mainly in two aspects: first, it assumes that production data are available only for the current and upcoming production period. Second, it considers queuing performance measures such as work in progress inventory and product lead time in the objective function of the layout problem. A process to solve the reconfigurable layout problem is proposed. A previously developed, open queuing network-based analytical model, called Manufacturing system Performance Analyser, is used to estimate the stochastic performance measures of a layout. These are combined with deterministic performance measures such as material handling cost to determine the layout for the next period. A case study is used to illustrate the process of solving the reconfigurable layout problem. 相似文献
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This article presents an integrated computer simulation–stochastic data envelopment analysis (SDEA) approach to deal with the job shop facility layout design problem (JSFLD) with stochastic outputs and safety and environmental factors. Stochastic outputs are defined as non-crisp operational and deterministic inputs. At first, feasible layout alternatives are generated under expert decision. Then, computer simulation network is used for performance modelling of each layout design. The outputs of simulation are average time-in-system, average queue length and average machine utilisation. Finally, SDEA is used with Lingo software for finding the optimum layout alternative amongst all feasible generated alternatives with respect to stochastic, safety and environmental indicators. The integrated approach of this study was more precise and efficient than previous studies with the stated outputs. The results have been verified and validated by principal component analysis. The unique features of this study are the ability of dealing with multiple inputs (including safety) and stochastic (including environmental) outputs. It also uses mathematical programming for optimum layout alternatives. Moreover, it is a practical tool and may be applied in real cases by considering safety and environmental aspects of the manufacturing process within JSFLD problems. 相似文献
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本文进一步研究了预测问题9(N,M)及17(N,M),在频域上及时域上都求得了齐次随机场{x(m,n)}在任意点上的预测值及预测误差,从而改进了徐业基已往的结果。 相似文献
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本文进一步研究了预测问题9(N,M)及17(N,M),在频域上及时域上都求得了齐次随机场{x(m,n)}在任意点上的预测值及预测误差,从而改进了徐业基已往的结果。 相似文献