摘要
为减小因软数控混合任务不确定性而引起的加工误差,提出了面向软数控的模糊反馈调度算法和两级结构的调度策略。在分析软数控任务划分和任务模型的基础上,研究了软数控模糊反馈调度算法的结构,并推导出调度算法表。通过对比仿真试验表明:不采用模糊反馈调度,加工误差达11.9%;采用模糊反馈调度,加工误差最大值仅为1.04%。给出了两级调度策略的架构,并对调度算法、任务可调度性及时标间隔进行了研究。所提出的两级调度策略已应用到基于Windows CE.NET的软数控系统中,实测任务运行状态显示,实时任务具有很好的确定性。仿真试验和具体实施的结果表明,提出的两种算法能满足软数控系统的个性化实时应用。
To reduce the mismachining tolerance caused by uncertainty of software Computer Numerical Control （CNC） real-time tasks, a fuzzy feedback scheduling algorithm and a two level hierarchical scheduling strategy oriented to software CNC system were presented. On the basis of the analysis for task division and task model, structure of fuzzy feedback scheduling algorithm was studied and scheduling table was derived. Then, the comparative simulation results demonstrated that error was up to 11.9 % with non-fuzzy feedback scheduling, error maximum was 1. 04 % with fuzzy feedback scheduling. Architecture of two-level scheduling strategy was presented. Its scheduling algorithm, task schedulability and time interval were studied in detail. The proposed two-level scheduling strategy was applied in Window CE. NET-based software CNC system. Application results revealed that real-time tasks had rational certainty. The simulation and implementation showed that the two scheduling algorithm could satisfy diversified real-time applicaton requirements.
出处
《计算机集成制造系统》
EI
CSCD
北大核心
2009年第3期529-536,共8页
Computer Integrated Manufacturing Systems
基金
国家自然科学基金资助项目(50575075)。~~
关键词
混合任务
软数控
模糊反馈调度
两级调度
仿真
hybrid tasks
software computer numerical control
fuzzy feedback scheduling
two level hierarchical scheduling
simulation
