基于透明传输的数控系统时钟同步算法  

Clock synchronization based on transparent transmission in CNC system

作　　者：章涵[1] 冯冬芹[1] 褚健[1] 王强 

机构地区：[1]浙江大学智能系统与控制研究所工业控制技术国家重点实验室,浙江杭州310027 [2]浙江中控技术股份有限公司,浙江杭州310053

出　　处：《计算机集成制造系统》2010年第4期873-877,共5页Computer Integrated Manufacturing Systems

基　　金：国家创新研究群体科学基金资助项目(60721062);国家863计划资助项目(2006AA040301;2007AA041301)~~

摘　　要：为实现线性或环形数控系统中所有节点间的精确时钟同步,解决时钟中继层数增加后节点同步精度无法满足数控系统节点间微秒级同步精度要求的问题,在网络时间协议算法实现点对点同步的基础上,引入时钟中继节点透明传输算法对同步消息进行固定时间缓存,降低了时钟中继节点晶振偏差对其他节点同步精度的影响,减少了所有节点多次同步过程中的偏差累积。通过理论分析和实验系统验证,表明该方法可有效降低同步偏差抖动,提高数控系统时钟同步的精度。To achieve precise time synchronization in line-topology or ring-topology Computer Numerical Control（CNC）system,time synchronization precision exceeded the microsecond level with time synchronization level increase should be solved.The time synchronization between two nodes was accomplished by Network Time Protocol（NTP）algorithm.The relay nodes used transparent clock algorithm,all time synchronization messages were restored in relay nodes for a definite time.Effect of deviation of crystal oscillator in relay nodes on precision was reduced.The accumulated deviation of all nodes was decreased.Theoretical analysis and experimental results showed that,this algorithm reduced the jitter of time synchronization and achieved higher level of precise time synchronization in CNC system.

关 键 词：数控系统 时钟同步 透明传输 节点 同步精度 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]