期刊
出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2021.09.018
关键词
Degradation reliability; Ball screws; Preload; Degradation model
This study focuses on the two-stage degradation of ball screws, proposing a framework, model with eight unknown parameters, and an estimation method. The degradation reliability model based on experimental data can accurately capture the real-degradation behavior of ball screws.
The performance of ball screws degrades with two-stage features due to the deteriorating inner mechanism and environmental stress, which lowers the positioning accuracy of the ball screws. It thus affects the accuracy of computer numerical control machine tools. However, no research has been carried out on the degradation reliability for ball screws and current studies usually treat the performance degradation of ball screws as a deterministic, single-stage degradation process, ignoring the randomness and two-stage features in the degradation progress. To this end, we firstly formulated a framework of degradation reliability for ball screws, and then established a two-stage performance degradation model with eight unknown parameters. To estimate the unknown parameters, we proposed a two-phase, expectation-maximization estimation method. Finally, we established a degradation reliability model based on the degradation test data and validated the model through experimental data, which shows the model can capture the real-degradation behavior of ball screws.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据