共查询到20条相似文献,搜索用时 171 毫秒
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针对单件小批生产的车间生产环境特点,采用两层递阶的车间作业调度策略对作业计划与调度控制进行集成,建立了一种集成化的作业调度系统原型,并着重讨论了两个层次上的调度求解方法,为优化和解决车间层作业调度提供了理论依据. 相似文献
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单析小批生产的作业计划与调度监控集成系统 总被引:2,自引:0,他引:2
介绍了一个实用化的单件小批生产条件下车间作业计划与调度监控集成系统。该系统由工艺准备子系统和生产作业计划及调度监控子系统组成,系统可快速建立或修正作业计划,实现了车间物流实时仿真及调及监控,最大限度地减少材料和劳动和的消耗,提高设备的利用率,从而降低产品的制造。 相似文献
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集成化车间作业计划动态关键路径编制算法 总被引:1,自引:0,他引:1
针对单件小批生产加工装配式制造的特点,结合车间作业计划与物料需求计划的集成化管控需求,提出了基于生产过程网络图的动态关键路径作业计划编制算法.算法按照零部件加工装配过程中的工艺顺序和装配关系,将计划期内订单的形成过程抽象化为生产过程网络图,并将物料需求计划映射为网络图中的节点,进行生产能力控制和加工装配约束.以生产过程网络图为作业计划编制的对象模型,以订单的交货期为依据,采用倒排的方式,通过动态寻找网络图中的关键路径来确定车间作业计划顺序和资源分配.通过某密封产品生产企业机加车间生产计划编制的实例,证明了该算法能快速有效地在有限生产能力条件下编制高效可行的车间作业计划,保证作业计划与物料需求计划的一致性. 相似文献
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一种改进的作业车间调度算法及其实现 总被引:6,自引:0,他引:6
单件小批量生产形式下的作业车间调度是生产调度中的一个重要问题,也是计算机集成制造系统中的一个关键环节,在实际生产中具有广泛应用。针对已有的求解作业车间调度问题的算法,引入了交换与移动相结合的机制,以提高调解效率,并在Visual Basic for Applications for Project 2000中实现了该算法。经过分析及一个10×10的调度问题的测试实例验证,利用这种算法求解作业车间调度问题可得到十分满意的结果。 相似文献
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在分析车间生产调度特点的基础上,提出基于多代理的车间生产调度模型。把车间生产调度系统分为车间代理、调度代理、在线控制代理、任务代理和资源代理,并对该系统进行仿真试验。对仿真结果进行了分析,为解决车间加工动态调度问题提供了一种新的方法。 相似文献
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基于混合遗传算法的动态车间调度系统的研究 总被引:3,自引:0,他引:3
分析了生产工艺计划与车间调度系统的集成原理,提出将CAPP模块与基于周期和事件驱动的滚动窗口调度有机地相结合,从而实现工序分段设计的CAPP系统和基于周期和事件驱动的滚动窗口再调度策略的生产调度系统的集成。在建立集成模型的基础上,对算法进行研究,把简单遗传算法(SGA)和模拟退火算法(SA)有机结合,使算法优化机制融合和优化结构互补,形成高效的混合遗传算法,使集成系统能适应连续加工过程中复杂的环境变化并高效地完成实时处理,减少突发事件造成的工序大范围的重新设计。实例验证了系统的可行性和有效性。 相似文献
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Manish Kumar Sunil Rajotia 《The International Journal of Advanced Manufacturing Technology》2006,28(1-2):109-116
Today’s manufacturing systems are striving for an integrated manufacturing environment. To achieve truly computer-integrated
manufacturing systems (CIMS), the integration of process planning and production scheduling is essential. This paper proposes
a framework for integration of process planning with production scheduling in a job shop environment for axisymmetric components.
Based on the design specifications of incoming parts, feasible process plans are generated taking into account the real time
shop floor status and availability of machine tools. The scheduling strategy prioritizes the machine tools based on cost considerations. 相似文献
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A Prototype Genetic Algorithm-Enhanced Multi-Objective Scheduler for Manufacturing Systems 总被引:2,自引:0,他引:2
L. P. Khoo S. G. Lee X. F. Yin 《The International Journal of Advanced Manufacturing Technology》2000,16(2):131-138
This paper describes the development of a prototype genetic algorithm-enhanced multi-objective scheduler for manufacturing
systems. A framework of the prototype scheduler is proposed which accepts data input from a database or file and outputs a
near-optimal schedule. A scheduling toolbox with scheduling models for job shop, flow shop and cellular manufacturing, forms
part of the prototype scheduler, and the schedule builder transforms the near-optimal solution into a valid shop floor schedule.
The prototype system was validated for various cases, with and without constraints and multiple objective functions, (makespan
and tardiness), enforced simultaneously with constraints. In the first case, the schedule generated was comparable to those
obtained by other researchers. The prototype system was also tested for its ability to handle dynamic scheduling, e.g. a rush
order. The results showed that all the job orders could be rescheduled within the original makespan, even though the order
of one of the jobs was doubled. 相似文献
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An intelligent operations scheduling system in a job shop 总被引:1,自引:1,他引:0
Dr Jihyung Park Mujin Kang Kyoil Lee 《The International Journal of Advanced Manufacturing Technology》1996,11(2):111-119
Scheduling jobs effectively under the consideration of actual loads on machines is one of the most complicated tasks in production control. The conventional scheduling methods fail because of the complexity of the tasks. To deal with the complexity, knowledge-based approaches to job shop scheduling have been attempted. This paper presents an interactive scheduling expert system, IOSS (Intelligent Operations Scheduling System), which performs both predictive and reactive scheduling. IOSS combines the knowledge-based scheduling method with the interactive scheduling method to generate a feasible schedule and to revise the existing schedule. It is based on opportunistic and interactive repair based problem solving within a blackboard architecture. To handle conflicting events, heuristics are applied from the order point of view. Flexible reaction management is possible while keeping the changes in the generated schedule to a minimum by adjusting the schedule for tardy operations or changes in job shop status. The effectiveness of the proposed concept is demonstrated by applying the developed system to an example case. 相似文献
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CAPP与车间作业计划集成的研究 总被引:7,自引:1,他引:7
阐述在制造过程中CAPP与车间作业计划之间集成的必要性,分析目前CAPP与车间作业计划集成的方法:在分析式集成方法的基础上,提出分层规划集成的模型,并讨论此模型的系统结构和特点。 相似文献
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可变机器约束的模糊作业车间调度问题研究 总被引:2,自引:0,他引:2
在车间实际加工中,工件的加工时间和交货期是一个模糊数,而且工件的某道工序有多台机器可供选择。针对这类作业的车间调度,提出了以极大化最小客户满意度为指标的可变机器约束的模糊作业车间调度模型,并给出了算法设计。应用遗传算法在适应度函数处理中引入模糊数处理方法,解决作业车间模糊调度问题,实现调度优化。仿真实验结果表明了该调度方法的有效性,为可变机器约束的模糊作业车间调度提供了一种实现途径。 相似文献