噪声与振动控制2019，Vol.39Issue(5)：191-196,6.DOI:10.3969/j.issn.1006-1355.2019.05.036
单跨双盘裂纹转子-轴承的动力学特性研究
Dynamic Study on a Single-span Double-disc Rotor-Bearing System with a Crack
摘要
Abstract
Based on the time-varying stiffness and the comprehensive model of the crack, the finite element method is used to establish two dynamic models of a cracked single-span double-disc rotor system, namely the system with the elastic bearing support at the left end and the nonlinear oil film bearing support at the right end and the system with the elastic supports at both ends. The fourth-order Runge-Kutta method is used to solve the models so as to study the effects of the crack location, the crack depth, the rotational speed and the variable quantity of the stiffness on the dynamic response of the cracked rotor system. The dynamic characteristics of the two models are mutually compared and analyzed. The results show that the vibration of the system when the crack is in the left shaft section of the rotor is always more severe than that of the system when the crack is in the middle section of the rotor under the same conditions of the crack depth, the rotational speed and the variable quantity of the stiffness. When the rotational velocity of the rotor is small, the vibration response of the system is mainly caused by the crack and the high-frequency component will appear on the spectrogram no matter whether the crack is on the left side or on the intermediate shaft section of the rotor. When the rotational velocity of the rotor is high, the vibration response of the system is mainly caused by the eccentricity. The results may provide the basis for the system fault diagnosis.关键词
振动与波/转子-轴承系统/裂纹/非线性振动/数值分析Key words
vibration and wave/rotor-bearing system/crack/nonlinear vibration/numerical analysis分类
机械制造引用本文复制引用
姚莉,南国防,郭威,钱万利..单跨双盘裂纹转子-轴承的动力学特性研究[J].噪声与振动控制,2019,39(5):191-196,6.基金项目
国家自然科学基金资助项目(51305267) （51305267）
