摘要
为研究刚性支承下故障转子系统的进动问题,建立了转子系统非线性动力学模型,通过数值仿真得到裂纹故障、碰摩故障以及裂纹-碰摩故障的进动信号,并基于全谱图分析了其变化规律和特点,最后利用Bently转子实验台对裂纹-碰摩故障下转子系统的全谱图进行了实验验证。结果表明:全谱图不仅反映了转子振动幅值的变化,而且包含了转子进动方向的信息;碰摩故障和裂纹-碰摩故障下转子的响应中出现-nX高倍频成分,转速比为0.55时-2X成分幅值高于2X成分幅值,呈现2阶反进动特征;碰摩故障和裂纹-碰摩故障时转子系统在高转速下的非线性特征更复杂,全谱图中出现±1/2X成分,此时转子系统处于周期2运动状态。
To study the precession of a faulty rotor system with rigid support, a nonlinear dynamic model was established for the rotor system to simulate the precession signals of the rotor system respectively with crack fault, rub-impact fault and crack rub-impact compound fault, so as to investigate the changing laws and characteristics based on full spectrum analysis. The full spectrum of the rotor system was experimentally verified under crack rub-impact compound faults on a Bently rotor test-bed. Results show that the full spectrum not only reflects the change of the rotor vibration amplitude, but also contains the information of the rotor precession direction. High-frequency components of-nX(n=1,2,3…) appear in the response of the rotor under rub-impact fault and crack rub-impact compound fault. When the speed ratio is 0.55, the amplitude of the-2 X component is higher than that of the 2 X component, showing second-order anti-precession characteristics. The nonlinear characteristics of the rotor system with rub-impact fault and crack rub-impact compound fault are more complex at high speeds, when ±1/2 X components appear in the full spectrum, and the rotor system keeps in the motion of period 2.
作者
向玲
杨阳
张悦
安朝辉
叶锋
XIANG Ling;YANG Yang;ZHANG Yue;AN Chaohui;YE Feng(Facully of Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第7期556-563,共8页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51675178)。
关键词
转子系统
碰摩
全谱分析
正、反进动
非线性动力学
rotor system
rub-impact
full spectrum analysis
positive and negative precession
nonlinear dynamics
作者简介
向玲(1971-),女,湖北随州人,教授,博士,研究方向为非线性动力学和故障诊断。电话(Tel.):15032496266,E-mail:ncepuxl@163.com。
