In order to ensure the safe and stable operation of rolling bearings under a given working condition

a reliability evaluation method of rolling bearings based on local tangent space alignment (LTSA) and Weibull proportional failure rate model （WPHM） was proposed. This method was used to extract the characteristic indexes in different analysis domains such as the time domain

frequency domain

time-frequency domain and statistics of the entire life cycle of the rolling bearing

select the characteristic indexes effectively and sensitively reflecting the running state of the rolling bearing

so as to construct high-dimensional multi-dimensional domain feature set; The local tangent space arrangement algorithm was used to fuse the high-dimensional multi-domain feature set to reduce the dimensionality

and a comprehensive feature index that can comprehensively reflect the degradation trend of rolling bearing performance was obtained as the response covariate of WPHM for reliability evaluation. Through the rolling bearing life test

the life of the test bearing was 491 min. It can be concluded that the bearing failed around 489 min

and the life error was less than 1%. Therefore

this method can effectively evaluate the operational reliability of rolling bearing.