分层抽样法在高速岔枕关键尺寸抽样检验中的应用  

Application of Stratified Sampling Method in Sampling Inspection of Key Dimensions ofHigh-speed Turnout Sleepers

作　　者：郑京伟 ZHENG Jingwei

机构地区：[1]中铁物总技术有限公司,北京100036

出　　处：《铁道技术监督》2021年第5期31-34,共4页Railway Quality Control

摘　　要：对比分析简单随机抽样与分层抽样2种方法。以设计文件为主要参考依据,将岔枕长度、套管数量作为分层标志,设计图号为客专线(07)005的60 kg/m钢轨18号单开道岔用混凝土岔枕分层抽样方案,并对抽样结果开展分析。计算结果表明,由于分层抽样的层与层间相互独立,分层抽样比简单随机抽样总体均值方差小,能够有效降低抽样误差,提高目标估计精度。The simple random sampling and stratified sampling are compared to estimate the population variance.Taking the design documents as the main reference,taking the length of turnout sleepers and the number of casings as the stratified marks,the stratified sampling scheme of(07)005 concrete turnout sleepers for 60 kg/m rail 18#single switch in passenger line is designed.The results show that,because the layers of stratified sampling are independent of each other,the variance of population mean of stratified sampling is smaller than that of simple random sampling,which can effectively reduce the sampling error and improve the accuracy of target estimation.

关 键 词：岔枕 分层抽样 质量控制 检验 

分 类 号：U213.37[交通运输工程—道路与铁道工程] O212.2[理学—概率论与数理统计]