Key fault propagation path identification of CNC machine tools based on maximum occurrence probability

Abstract

In order to revise the deviation caused by ignoring the dynamic character of fault propagation in traditional fault propagation path identification methods, a method based on the maximum occurrence probability is proposed to identify the key fault propagation path. Occurrence probability of fault propagation path is defined by dynamic importance, dynamic fault propagation probability and fault rate. Taking the fault information of CNC machine tools which subject to Weibull distribution as an example, this method has been proven to be reasonable through comparative analysis. Result shows that the key fault propagation path of CNC machine tools is not unique, but changes with time. Before 1000 hours, key fault propagation path is electrical component (E) to mechanical component (M); after 1000 hours, key fault propagation path is auxiliary component (A) to mechanical component (M). This change should be taken into account when developing maintenance strategies and conducting reliability analysis.

Failure prediction of mechanical system based on meta‐action

“…Current research mostly starts with the identification of key components and no reliable follow-up measures have been taken for the identified key components. 14,15 So the goal of identification, monitoring, and prediction guided this article, providing an effective theoretical system method for fault prediction and health management (PHM) of highly reliable mechanical products.…”