早期碰摩故障下转子进动信号变化规律的仿真分析  

The Simulation Research on Rotor Precessional Motion Signal Fluctuation Rules of Early Rub-impact Fault

作　　者：孙云岭[1] 张永祥[1] 常汉宝[1] 王凯 

机构地区：[1]海军工程大学船舶与动力学院,武汉430033 [2]海军驻郑州地区军代室,郑州450052

出　　处：《汽轮机技术》2009年第5期376-378,共3页Turbine Technology

基　　金：中国博士后科学基金资助项目(20070420942);国防"十一五"预研资助项目(40101020103)

摘　　要：针对早期碰摩时转子振动特征与其它旋转机械常见故障(如不对中)特征相重复的问题,研究转子进动信号中蕴含的早期碰摩故障特征。建立了转子动力学模型并求解得到仿真转子振动信号,从中计算出4项转子进动信号(公转半径、径向运动速度、公转转速、公转加速度)并进行了分析。结果表明发生早期碰摩时,转子进动信号的波动幅度会急剧加大,其中公转加速度信号会在碰摩点处发生瞬间剧烈波动,可用来指示碰摩部位;频谱中高阶倍频成分大大增加,大部分情况下高阶倍频代替转频成为主要成分。这些特征与正常状况有显著区别,可望用于碰摩故障的诊断。As the rotor vibration characters of early rub-impact fault are similar to the characters of other constant faults such as misalignment, in this paper rotor precessional motion signals are studied to extract early rub-impact fault features. The rotor dynamics simulation models is set up to request rotor vibration simulation signals, and four rotor precessional signals are calculated which contain revolution radius, radial move speed, revolution speed and revolution acceleration. The time domain analysis outcome of rotor precessional signals indicate that fluctuation amplitude of four rotor precessional signals increase rapid when early rub-impact happen, and there are transient sharp fluctuation in revolution acceleration signal at rub-impact point which could indicate fault position. The frequency domain analysis outcome indicate that high order multiple frequency element increase greatly when early rub-impact happen, and high order multiple frequency element become the main element instead of rotation frequency element. The fault features are very distinctly, may be used in fault diagnosis of rub-impact.

关 键 词：转子碰摩 转子进动 仿真模型 

分 类 号：TK268[动力工程及工程热物理—动力机械及工程]