虚拟单元制造中考虑随机扰动的多级动态稳健调度策略研究

发布时间：2018-04-03 08:11

本文选题：虚拟单元制造　切入点：动态调度　出处：《江苏科技大学》2015年硕士论文

【摘要】：近年来,随着我国经济的快速发展以及技术的不断进步,市场竞争变得越来越激烈,用户的需求也朝多样化的趋势发展,这将导致多品种小批量的生产方式会逐步成为生产制造业的主流生产方式。为了适应多样、动态和复杂的市场环境,对制造型企业就要提出更高的要求。因此,采用先进的制造技术以及高效的管理机制,以缩短生产周期,提高生产系统的效率、柔性和竞争能力,已经成为一个研究的热点问题。虚拟单元制造系统作为单元制造系统的新发展,正逐渐成为一种受到人们重视的先进制造方式。虚拟单元制造能够有效降低在制品库存和生产成本,减少设备的移动成本和调整时间,从而提高生产企业的敏捷性和生产柔性,同时也大大提高了企业的资源使用效率。虚拟生产单元本质上就是一个生产计划与控制系统,它需要对生产任务和生产资源在单元间和单元内进行分配,消解单元内及单元间的资源需求冲突,监控生产任务的执行。但由于虚拟单元制造环境中的复杂性、动态性以及资源的有限性,在调度的实施过程中可能出现不确定的扰动事件,并引起资源冲突,使得生产计划无法正常实施,造成任务拖期、生产系统效率低下等问题。在实际生产中,生产系统的效率和稳定性通常会表现出一定的矛盾,出现动态扰动时反复重调度会扰乱生产的实施。因此,在生产过程中,应考虑实际车间信息和随机事件可能带来的调整和变化,在生产状态发生改变时,采取有效的调整措施进行有效的管理和控制,保证生产过程的连续性和高效率。本文通过对虚拟单元调度理论及生产调度过程中存在问题的研究,在分析随机扰动事件的前提下,提出了以事件与周期驱动为基础的多级动态稳健调度策略,以保证生产过程的效率和稳定,提高虚拟制造单元生产调度的柔性。在分析事件扰动率的基础上,针对具有不同影响程度的事件分别采取三种不同的调度策略:缓冲整合策略、顺序调整策略和重调度策略。缓冲整合策略充分利用了机器上工序之间的缓冲,工序的加工进行简单的平移。顺序调整策略考虑了新插入加工工序和已有工序的加工优先级,确定工序加工的先后顺序。在重调度策略中,考虑了设备柔性因素,提出了基于冲突消解的重调度机制,针对不同冲突类型分别采用部分重调度或完全重调度策略。部分重调度只需对存在冲突的时间区域内作出生产计划调整,无需对整个调度期重新安排,这在保证工期不发生延迟的情况下提高了生产系统的稳定性;完全重调度策略在整个调度期内调整生产计划,以保证完工时间不会出现延误或使得延误最小化。多级调度策略在保证系统生产效率的前提下,提高了生产系统生产过程的稳定性。为验证本文所提出的虚拟单元多级动态稳健调度策略的效果,以沪东船厂曲面分段制造车间中的部分零件加工过程为背景,将本文所提方法应用其中,对结果进行分析总结,验证了方法的可行性和有效性。
[Abstract]:In recent years, with the continuous progress of the rapid development of China's economy and technology, market competition becomes increasingly fierce, the demand of the user also towards the diversification trend of development, which will lead to many varieties and small batch production mode will gradually become the mainstream mode of production manufacturing industry. In order to adapt to the diverse, dynamic and complex market environment. And put forward higher requirements to manufacturing enterprises. Therefore, the use of advanced manufacturing technology and efficient management mechanism, in order to shorten the production cycle, improve the efficiency of the production system, the flexible and competitive ability, has become a hot research issue. The new development of virtual cellular manufacturing system as a unit of manufacturing system. It has gradually become a kind of advanced manufacturing mode by people's attention. The virtual manufacturing unit can effectively reduce the inventory and production costs, reduce the cost and time adjustment of mobile equipment Thus, the production enterprises to improve the agility and flexibility of production, but also greatly improve the efficiency of resource use. Virtual enterprise production unit is essentially a production planning and control system, it needs the production tasks and production resources are distributed among units and units, resource conflict resolution unit and units. And monitor the production task. But because of the complexity of the virtual manufacturing unit in the environment, limited resources and dynamic, uncertain disturbance events may appear in the process of implementing scheduling, and cause resource conflicts, make production plan can not be properly implemented, resulting in task tardiness, low efficiency and other production problems. In the actual production, the efficiency and stability of the production system will usually show a certain contradiction, the implementation of dynamic disturbance re scheduling will disrupt production. Because of this, in the production In the process, should consider the actual workshop information and random events may bring about adjustments and changes in production status changes, take effective measures to manage and control, to ensure continuous and efficient production process. Based on the virtual unit scheduling theory and the problems of production scheduling in the process. In the premise of analyzing random disturbance events, put forward to the event and cycle driven multilevel based dynamic robust scheduling strategy to ensure the efficiency and stability of the production process, improve the virtual manufacturing cell scheduling flexibility. In the analysis of disturbance event rate on the basis of the event has different influence degrees take three different respectively: buffer scheduling strategy integration strategy in order to adjust their strategy and scheduling strategy. Buffer integration strategy makes full use of the machine processes the buffer between processes Processing of simple translation. In order to adjust the strategy considers the processing process and the new priority insertion process, determine the sequence of processes. In the scheduling strategy, considering the flexible equipment factors, this paper puts forward the scheduling mechanism based on conflict resolution, according to the different types of conflicts were used in part or completely rescheduling rescheduling partial rescheduling strategy. According to the production plan to adjust the time of conflict in the region, without re arrangement of the entire scheduling period, the guarantee period does not occur in the case of delay improves the stability of production system; complete rescheduling strategy to adjust the production plan in the whole dispatching period, to ensure the completion time is not the delay or delay minimization. The hierarchical scheduling strategy makes the system under the premise of ensuring production efficiency, improve the stability of the production process of the production system in order to verify. Virtual unit multistage dynamic proposed robust scheduling strategy to surface effect, Hudong Shipyard segment parts machining workshop as background, the application of the method proposed in this paper, the results were analyzed and summarized, verify the feasibility and effectiveness of the method.

【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：F273;F424

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