Rolling bearing property retention reliability predication method

Abstract

The invention discloses a rolling bearing property retention reliability predication method. The method comprises: acquiring performance data at an optimal operation period of a rolling bearing, so as to construct a performance sample density function; obtaining a confidence interval of a confidence coefficient and a performance random variable according to the little probability event principle; and according to a Poisson counting process, acquiring frequencies, which are out of the performance random variable confidence interval, of the performance data and the rolling bearing property retention reliability, further acquiring the relative performance retention reliability of the rolling bearing in the future, and predicating the invalidation degree of an optimal performance attitude of the rolling bearing in the future time. By means of the method, any prior information of the performance density function is not needed, performance thresholds are not needed to be preset, the invalidation degree of the optimal performance attitude of the rolling bearing in the future time can be predicated, the predication accuracy is high, the invalidation hidden danger can be discovered in advance, and decisions can be provided for taking intervention measures in time and avoiding occurrence of serious safety accident.

Description

technical field [0001] The invention belongs to the technical field of rolling bearing service performance failure evaluation and performance reliability prediction, and in particular relates to a prediction method for rolling bearing performance maintenance reliability. Background technique [0002] Rolling bearing is a precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss. Rolling bearings are generally composed of inner rings, outer rings, rolling elements and cages. The function of the inner ring is to cooperate with the shaft and rotate together with the shaft; the function of the outer ring is to cooperate with the bearing seat to play a supporting role; Roll between the ring and the outer ring to bear and transmit the load; the cage can evenly distribute the rolling elements, prevent the rolling elements from falling off and collide with each other, guide the ro...

AI Technical Summary

Problems solved by technology

However, this method requires prior performance tests to obtain performance thresholds, which are obtained through experiments, and the corresponding thresholds are different depending on the selected damage site and sensor

Therefore, in the existing reliability evaluation methods, when the prior information of the performance density function is unknown and the performance threshold is not set in advance, it is impossible to predict the variation process of the performance reliability of the rolling bearing

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