滚动轴承寿命及可靠性试验评定方法研究

Study on a life and reliability test evaluation methods of rolling bearings under small sample

对于滚动轴承寿命及可靠性试验,在不进行国家规定的寿命试验时,为节约样品成本与试验成本,一般所选的样本量较小.然而使用方或生产方希望能在样本数量与失效数量均较少的情况下,在一定精度下能定量客观地给出被试轴承的形状参数及可靠度、平均寿命等可靠性指标.为此,利用Bayes方法,依据滚动轴承寿命服从二参数Weibull分布的特点,选用无信息先验分布,根据试验数据,给出被试轴承形状参数与可靠度的点估计及形状参数、可靠度、可靠寿命与平均寿命的区间估计.为小样本少失效条件下滚动轴承可靠性的定量评价提供了有效方法.

There are many disadvantages in bearing life and reliability test evaluation method.To compensate for these shortcomings,bayes method and non-information prior distribution were chosen.The samrling point estimates of shape parameter and reliability of the bearing were given.The interval estimation methods of the shape parameters,reliability,reliable life and mean life were given too.Under small samples and less failure,an effective and quantitative evaluation way of rolling bearing is given.