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Genetic algorithms and flexible process planning in the design of fault tolerant cell control for flexible assembly systems

机译:柔性装配系统容错单元控制设计中的遗传算法和灵活的过程计划

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This paper presents a methodology for the advancement of fault tolerance in cell control when applied to a class of flexible assembly system. A literature survey of flexibility in manufacturing was conducted, which leads to the formulation of a flexible process planning (FPP) scheme which efficiently encodes all possible operation plans of products to be manufactured in typical automated manufacturing systems. Genetic algorithms are designed which can retrieve all working operation plans (WOP) from a FPP database, and can determine a production schedule and assignment of operations to workplaces which minimise the overall make-span of the job orders in near real-time. The FPP scheme and the genetic algorithm are successfully integrated into a prototype colour Petri net (CPN) based cell control system which allows the system to regenerate its control logic and the production schedules whenever system faults occur, and therefore enable it to continue in operation. The successful implementation of this fault recovery cell control system within a demonstrator assembly cell indicates that the framework proposed provides a foundation for the further development and application of advanced cell control.
机译:本文提出了一种用于单元控制的容错技术的方法,该方法可应用于一类柔性装配系统。进行了有关制造灵活性的文献调查,这导致制定了柔性过程计划(FPP)方案,该方案有效地编码了要在典型的自动化制造系统中制造的产品的所有可能的操作计划。设计了遗传算法,可以从FPP数据库中检索所有工作作业计划(WOP),并可以确定生产计划和对工作地点的作业分配,从而几乎实时地最小化作业单的整体工期。 FPP方案和遗传算法已成功集成到基于原型彩色Petri网(CPN)的单元控制系统中,该单元控制系统可使系统在发生系统故障时重新生成其控制逻辑和生产计划,从而使其能够继续运行。该故障恢复单元控制系统在演示器装配单元中的成功实施表明,提出的框架为高级单元控制的进一步开发和应用提供了基础。

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