基于退化量分布的电主轴可靠性评估

针对在较短的时间内难以评估高可靠度、长寿命电主轴可靠度的问题，利用基于退化量分布的方法对其可靠性进行评估。首先对电主轴的失效机理进行了分析;然后结合退化量分布的基本原理和退化试验数据对电主轴的可靠性进行评估，分别求出电主轴的4个常用可靠性指标，同时绘制可靠度曲线、失效概率密度曲线以及失效率曲线;最后估计出电主轴的平均寿命和特征寿命。该方法缩短了试验时间,提高了评估精度,对长寿命产品的可靠性研究具有一定的意义。

Reliability Assessment of Electric Spindle Based on Degradation Values Distribution

It is difficult to assess the reliability of an electric spindle with high reliability and long lifetime in relatively short time. Based on the degradation value distribution method, the reliability of an electric spindle was evaluated. First of all, the failure principle of electric spindle was analyzed. Moreover, according to the basic principle of degradation value distribution and degradation test data, an assessment about electric spindle was made. Four commonly used reliability indexes of an electric spindle were calculated. In the meantime, reliability curves, failure probability density and failure rate were drawn. Finally, mean lifetime and characteristics lifetime of an electric spindle were evaluated. It has certain significance for products with long lifetime for the researches of reliability.