基于等效原理的滚动轴承加速试验设计与评估

In view of the characteristics that more and more rolling bearings have high reliability and long life, a method based on the principle of equivalence was proposed for the accelerated test design and assessment of rolling bearings. Firstly, the relationship between the accelerated stress and the normal stress in terms of life distribution was established based on the principle of equivalence. Secondly, the estimation method of the shape parameters of the residual strength distribution of the bearing was individually given for the three common data types in the engineering, including zero-failure data, type-I and type-II censored data. Subsequently, the accelerated stress levels and test cut-off times for rolling bearings at a given reliability, as well as the one-sided lower confidence limits for the bearing reliability and reliable life at a given stress, were derived, respectively. Finally, a validation analysis was conducted using a specific bearing engineering case study. The results indicated that the calculated lower one-sided confidence limits for life and reliability at normal stress levels were 293.94 h and 0.945, closely aligning with the actual values of 300 h and 0.95. This could strongly support the design and evaluation of accelerated testing for rolling bearings.