共查询到20条相似文献,搜索用时 109 毫秒
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以优化流程工业生产为目标,研究了将基于惯性权重的粒子群算法应用到流程工业的生产调度问题。在对流程工业生产调度问题进行分析的基础上,建立了以总加工完成时间最短为优化目标的生产调度模型。调度算法采用动态惯性权重,使惯性权值在粒子群算法搜索过程中线性变化,以提高粒子群算法的优化性能。给出了粒子编码与解码实现方法,以及具体的算法实现过程。以某流程工业企业生产调度实例为例,利用建立的优化调度模型和设计的粒子群算法进行了实验仿真,结果表明,建立的调度模型和设计的算法是可行的,与蚁群系统方法相比较,有较好的调度性能,适用于解决流程工业实际生产调度问题。 相似文献
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熊浩 《电子制作.电脑维护与应用》2014,(20)
对于电网安全运行而言,电力调度系统检修工作的重要性不容忽视,它能够有效防止电力事故和故障问题的发生。随着社会经济高速发展,电力系统的大动脉作用越发突出,若是电力系统运行出现阻滞则势必影响到经济发展的有序运转,这更加突出了电网系统中电力调度的核心枢纽位置。本文重点分析了电力调度系统检修工作的具体流程及控制措施,旨在合理降低危险点,提高电力系统运行的安全性与可靠性。 相似文献
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针对当前Hadoop集群固有的任务级调度分配方法在运行中存在的负载分布不均的现象,着重对集群节点的执行能力进行了分析与研究.提出了一种基于节点能力的任务自适应调度分配方法.该方法根据节点历史和当前的负载状态,以节点性能、任务特征、节点失效率等作为节点任务量调度分配的依据,并使各节点能自适应地对运行的任务量进行调整.实验结果表明集群的总任务完成时间明显地缩减,各节点的负载更加均衡,节点资源的利用更为合理. 相似文献
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随着卫星地面系统业务流程需求越来越多样化,规模越来越庞大,传统的软件实现方式和技术不能够满足高效可靠地实现卫星地面应用系统业务流程的要求;文章对卫星地面站站控系统的任务调度业务进行需求调研,对领域内共有特性进行模型抽取,并以Acitvi引擎为基础,在此之上形成一个面向运行控制软件的领域框架;在开发站控系统的流程调度软件时,可以通过对事先定义的业务处理接口进行少量代码编写加以扩展和配置来实现业务过程控制,从而为面向卫星地面站业务领域的流程应用开发提供了一个灵活、可扩展的快速开发平台. 相似文献
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Flow shop scheduling for separation model of set-up and net process based on Branch-and-Bound method
Kenzo Kurihara Yann-Liang Li Nobuyuki Nishiuchi Kazuaki Masuda 《Computers & Industrial Engineering》2009,57(2):550
Lots of research reports on flow shop scheduling problems have been reported. Generally speaking, these models are applicable to a simple model with no separation of set-up processes and net ones. In many production lines, we cannot ignore the set-up times in comparison with the net processing times. We can expect to shorten the total processing time by executing the set-up processes and net ones in parallel. We need a parallel operation model to improve schedule results.We will propose a new scheduling method for multi-stage flow shops. The aim of the method is to shorten the total processing time by operating the set-up processes and the net ones of each job in parallel. We applied the Branch-and-Bound method and developed a new calculation algorithm for the lower bound estimation of the total processing time. Finally, we will evaluate our proposed method by some numerical experiments using actual production line data. 相似文献
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炼油生产调度为混合整数规划问题,随着规模的增大,其求解时间随问题规模呈指数增加,使得大规模长周期炼油生产调度问题难以在合理的时间内求解.针对该问题,本文提出了一种基于生产任务预测与分解策略的炼油生产调度算法,该算法能在短时间内获得大规模调度问题的满意解.所提算法将原问题沿时间轴分解为若干个调度时长相同的单时间段子问题,并设计了基于深度学习的单时间段生产任务(组分油产量)预测模型,用于协调子问题的求解.其中,生产任务预测模型通过易于获得的小规模问题的全局最优调度方案训练得到.最后,通过与商业求解器Cplex以及现有算法的对比,实验结果表明了所提算法的有效性. 相似文献
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Lihui Wang Yijun Song Qiaoying Gao 《Engineering Applications of Artificial Intelligence》2009,22(7):1127-1138
The objective of this research is to develop methodologies and a framework for distributed process planning and adaptive control using function blocks. Facilitated by a real-time monitoring system, the proposed methodologies can be applied to integrate with functions of dynamic scheduling in a distributed environment. A function block-enabled process planning approach is proposed to handle dynamic changes during process plan generation and execution. This paper focuses mainly on distributed process planning, particularly on the development of a function block designer that can encapsulate generic process plans into function blocks for runtime execution. As function blocks can sense environmental changes on a shop floor, it is expected that a so-generated process plan can adapt itself to the shop floor environment with dynamically optimized solutions for plan execution and process monitoring. 相似文献
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Integration of process planning and scheduling functions 总被引:1,自引:0,他引:1
Automated process planning (APP) has received a considerable amount of attention in recent years. This has mainly been due to APP allowing for the bridging of the gap between design and manufacturing, and for its automation of the related tedious human task. While there have been several efforts in developing interfaces between computer-aided design (CAD) and APP, little attention has been given to the integration of APP and scheduling, which is likely to be of even higher importance. This paper addresses the basic issues involved in the integration of the two functions, demonstrates a methodology and the potential benefits of the integrated approach by an example, and presents directions for future research. 相似文献
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基于组态王的过程控制综合实验测控装置 总被引:8,自引:0,他引:8
针对现有过程控制教学的现状,介绍了基于组态王的过程控制综合实验测控装置。该系统是一个小型集散控制系统,装有组态王工控软件的上位计算机完成对被控对象的模拟和监控(SCA—DA),通过RS-232/RS485和下位机PLC串口通信,下位机由西门子PLC(S7—200)组成,实时检测被控对象的温度、压力、液位、流量四个参数,把采集到的数据进行处理和保存,并根据控制要求进行PID运算,运算结果控制执行器动作,执行器为电动调节阀、变频器和电动机。并以串级控制系统为例,说明了过程控制系统的组态及实验步骤。实践证明,该实验装置充分模拟工业控制现场,操作简单,实验效果良好。 相似文献
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间歇精馏过程的模糊逻辑与增益自调整PID混合控制 总被引:1,自引:0,他引:1
针对间歇精馏过程的强非线性和非平稳时变特性,结合模糊逻辑控制和增益自调整PID控制的优点,提出了一种模糊逻辑和增益自调整PID混合控制的先进控制策略,详细推导了其控制算法,设计了相应的控制器,并在EuroBEEB工控机上用实时BASIC语言编程实现,对一套甲醇/水二元间歇精馏塔的塔顶浓度进行了推断控制实验,获得了比单独采用模糊逻辑控制时更好的控制结果。这说明,模糊逻辑和增益自调整PID混合控制是强非线性和非平稳时变过程的一种有效控制策略。 相似文献
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Remanufacturing has attracted growing attention in recent years because of its energy-saving and emission-reduction potential. Process planning and scheduling play important roles in the organization of remanufacturing activities and directly affect the overall performance of a remanufacturing system. However, the existing research on remanufacturing process planning and scheduling is very limited due to the difficulty and complexity brought about by various uncertainties in remanufacturing processes. We address the problem by adopting a simulation-based optimization framework. In the proposed genetic algorithm, a solution represents the selected process routes for the jobs to be remanufactured, and the quality of a solution is evaluated through Monte Carlo simulation, in which a production schedule is generated following the specified process routes. The studied problem includes two objective functions to be optimized simultaneously (one concerned with process planning and the other concerned with scheduling), and therefore, Pareto-based optimization principles are applied. The proposed solution approach is comprehensively tested and is shown to outperform a standard multi-objective optimization algorithm. 相似文献