基于统计的润滑剂摩擦因数测试方法研究

摘要

润滑剂摩擦因数测试具有很大的误差,ASTM D5183-05和SH/T0762-05标准的数据重复性和再现性误差都分别为20%和49%.根据数学理论导出在一定置信度下的试验数据误差估算式;通过多次抽样测试认为四球摩擦因数测试的重复性误差可以控制在1%～5%以内;提出根据试验数据方差来预计试验次数的计算公式,并指出为保证试验结果的可靠性除了保证必要的测试次数外还要确保实际测试精度.%The test error in the determination of the friction coefficient of lubricants is rather large.The data repeatability and reproducibility of ASTM D5183-05 and SH/T0762-05 are 20％ and 49％ respectively.An expression for the test error estimation with given confidence level was deduced from statistical theory.With duplicate tests, the repeatability for the determination of the friction coefficient of lubricants using four-ball wear test machine can be reduced to 1％ ～ 5％.A formula for estimating the number of duplicate tests by the variance of test data was proposed.To ensure the reliability of test result,the number of duplicate tests and the calculated precision of tests must be ensured.