数控系统故障分布规律的确定与选择  

Determination and selection of failure distribution of the CNC system

作　　者：高连生[1] 任增[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《制造技术与机床》2016年第8期100-103,108,共5页Manufacturing Technology & Machine Tool

基　　金："高档数控机床与基础制造装备"科技重大专项(2010ZX04014-017)

摘　　要：针对高可靠性的数控系统产品故障间隔时间样本量少的特点,提出采用故障总时间法按故障发生的先后顺序将考察的同系列多台数控系统的样本数据统计到一台样本上来考察该系列数控系统故障间隔时间的分布模型。为了增加可靠性研究的准确度,分别假设故障间隔时间同时满足常用的四种寿命分布函数,对通过检验的分布模型分别采用误差面积比指数、相关指数法以及灰关联分析法计算样本数据与参考分布的误差面积比指数、相关指数以及关联度,根据误差面积比指数、相关指数以及关联度的大小进行分布模型的择优,最终确定该系列数控系统故障间隔时间服从威布尔分布。同时给出了故障率曲线,为数控系统可靠性的预测和控制提供依据。According to the characteristic of little failure interval sample of CNC systems with high reliability,the total failure time method is put forward to count several CNC systems samples data of one series to one sample according to the order of the failure time of CNC systems to survey the failure distribution model of this series of CNC systems. In order to increase the accuracy of reliability research,time between failure are assumed to satisfy four kinds of life distribution function,the optimum distribution model is determined by applying method of error area ratio,relevant index and gray correlative analysis. According to the error area ratio,relevancy and correlation degree the optimized distribution model is confirmed to obey Weibull distribution. At the same time the failure rate curve is given which provides the basis for reliability prediction and control of CNC system.

关 键 词：故障间隔时间 故障总时间法 误差面积比指数 相关指数 威布尔分布 

分 类 号：TG659[金属学及工艺—金属切削加工及机床]