基于性能退化数据的数控转台单子样可靠性分析  

Performance degradation data based NC rotary table reliability predictions using a single sample

作　　者：张云[1] 于广[1] 王立平[1] 姜楠[1] ZHANG Yun;YU Guang;WANG Liping;JIANG Nan(Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipment and Control,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学机械工程系,精密超精密制造装备及控制北京市重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2020年第4期299-305,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技重大专项(2016ZX04004-004)。

摘　　要：针对数控转台可靠性高、寿命长、失效样本数据少的情况,采用基于性能退化数据的可靠性评估方法进行研究。在试验过程中通过测量转台不同角度回转精度的性能退化量扩充试验数据,根据试验数据计算得出数控转台的伪失效寿命值。为了提高转台可靠性评估结果的准确率,采用虚拟增广原理扩展试验数据,再对扩展试验数据采用数学方法进行分析。结果表明:该方法可对数控转台的可靠性进行评估,得到数控转台的可靠度、失效分布密度函数和预期平均寿命等可靠性指标。该方法节省了试验成本与时间。Reliability evaluations of numerical control(NC) rotary tables are limited by their good reliability, long lives and few samples. This paper presents a reliability evaluation method based on performance degradation data for NC rotary tables. The test data is expanded by measuring the performance degradation of a rotary table at different angles to calculate a pseudo-life for the rotary table. The accuracy of the rotary table reliability evaluation is improved using the virtual augmentation principle to expand the test data with the virtual augmented samples analyzed mathematically. The results show that this method can be used to determine various reliability indexes such as the reliability, failure distribution density function and predicted average life of NC rotary tables. This method significantly reduces the test costs and time.

关 键 词：数控转台 单子样 性能退化数据 虚拟增广 可靠性 

分 类 号：TH122[机械工程—机械设计及理论]