摘要
The agility and the flexibility of the current shop floor control systems have been limited so far, owing to the lack of structural flexibility and agility in its control software layer. Most of them are based on traditional hierarchical architecture and the top down approach and depend structurally on their specific configuration and job scheduling. Not only can they hardly satisfactorily adapt to these increasing changes and disturbances, but also make the redevelopment and maintenance of shop floor control system (SFCS) to need high cost and much time. And SFCS based on the heterarchical architecture don′t provide a predictable and high performance system, especially not in the heterogeneous environments, where the resources are scarce and the current decisions have serious repercussions on the future performances. For this reason, the heterarchical control is hardly applied in industry. Obviously, it is necessary to develop a new structural framework of reconfigurable SFCS to improve their agility, flexibility and maintainability. This paper presents a holonic framework of reconfigurable SFCS based on holonic manufacturing concepts. The framework is composed of resource holons, product holons and other staff holons. The model of each holon and the co operative mechanisms of holons are described. To verify the proposed approach experimentally, a prototype reconfigurable SFCS for a flexible manufacturing shop floor producing discrete parts is implemented.
由于控制层结构上缺乏柔性和敏捷性，自动化制造系统的车间的柔性和敏捷性还受到限制。事实上，当前的大多数车间控制系统是基于传统的分层递阶结构和自顶而下的方法来开发的，结构上依赖于各自的具体配置和它们的作业调度。这类车间控制系统不仅不能适应车间的各种变化和意外的需求，而且重新开发和维护的成本很高。并行结构的车间控制系统很难提供高的可预测性和高系统性能，尤其是在异构环境中。由于资源的缺乏及当前决策的预测性不强，平行控制结构的车间控制系统很少在工业中应用。由此可见，研究开发一种新的可重配置的车间控制系统的结构框架是必要的，以提高其敏捷性、柔性和可维护性。本文提出一种基于ｈｏｌｏｎｉｃ制造系统（ＨｏｌｏｎｉｃＭａｎｕｆａｃｔｕｒｉｎｇＳｙｓｔｅｍ）概念的可重配置车间控制系统的合弄框架。它由资源（Ｈｏｌｏｎ）、产品Ｈｏｌｏｎ等主体Ｈｏｌｏｎ组成。本文描述了Ｈｏｌｏｎ的模型及各自的协作机制。用此框架开发了一套用于离散作业的柔性制造车间的原型可重配置车间控制系统。
基金
江苏省自然科学基金
