作　　者： ; ; ; ;

机构地区： 华南理工大学

出　　处： 《华南理工大学学报（自然科学版）》 2009年第2期1-6,共6页

摘　　要： 为分析软数控实时任务的不确定性与加工精度的关系,提出一种基于模型的加工误差分析方法.首先研究采样抖动、输入-输出抖动、数控任务可调度及加工误差评估等相关理论;然后建立二轴数控系统加工误差分析仿真模型;最后对任务抖动、任务不可调度及实时突发任务等与加工误差的相关性进行仿真.结果表明:采样抖动时间为任务周期的80%时,误差达4.7%;输入-输出抖动时间为任务周期的80%时,误差达1.2%;40%的事务不能在时间限内完成时,误差达13.4%.该结果说明不可调度事务会引起较大的加工误差. In order to reveal the relationship between the uncertainty of software numerical control （NC） real-time tasks and the manufacturing accuracy, a model-based analysis method of mismachining tolerance is presented. First, the relevant theories concerning the sampling jitter, the input-output jitter, the NC task schedulability and the mismachining tolerance evaluation are analyzed. Then, a two-axis NC simulation model is established. Finally, some simulations are performed to reveal the relationships between the mismachining tolerance and the factors such as task jitter, task non-schedulability and aperiodic real-time tasks. The results show that the mismachining tole- rance respectively reaches 4.7% and 1.2% when the sampling jitter time and the input-output jitter time are both 80% of the task period, and that the tolerance is up to 13.4% when 40% of jobs fail to meet their deadlines. It is thus concluded that non-schedulable jobs may result in a noticeable mismachining tolerance.

关 键 词： 数控 加工误差 时间特性 调度算法 不可调度事务

领　　域： [金属学及工艺]