Vibration analysis of rotor for crack identification

被引：0

作者：

Saavedra, P.N. ^{[1
]}

Cuitiño, L.A. ^{[1
]}

机构：

[1] Department of Mechanical Engineering, Faculty of Engineering, University of Concepción, Concepción, Chile

来源：

JVC/Journal of Vibration and Control | 2002年 / 8卷 / 01期

关键词：

Crack identification;

D O I：

10.1177/1077546302008001526

中图分类号：

学科分类号：

摘要：

A theoretical and experimental dynamic analysis of a rotor-bearing system with a transversely cracked shaft is presented. To model the system for FEM analysis, a finite element for a cracked cylindrical shaft is developed. The additional flexibility due to the crack is evaluated from the linear fracture mechanics, using a breathing crack model derived in a rigorous way. A simplified opening/closing crack model is proposed to reduce the computational effort. The resulting parametrically excited system is nonlinear, and the equations of motion are solved using Hilbert, Hughes, and Taylor integration method (HHT) implemented in Matlab platform, where the stationary vibration caused by gravity and unbalance is analyzed. The results show that for half the first critical speed, the super-harmonic 2 × Ω and the typical orbit provide good indices for crack detection in rotating shafts.

引用

页码：51 / 67