非稳态油膜力作用下偏角不对中碰摩转子系统振动特性分析  

Vibration Characteristics of a Rub-Impact Rotor System with an Angular Misalignment under the Unsteady Oil-Film Forces

作　　者：朱拥勇[1] 周奇郑[1] 王德石[1] 

机构地区：[1]海军工程大学兵器工程系,湖北武汉430033

出　　处：《武汉大学学报（理学版）》2013年第3期233-238,共6页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(50875259)资助项目

摘　　要：建立了非稳态油膜力、碰摩力作用下,偏角不对中轴系的横向振动模型,将Jeffcott转子模型推广至约束条件下的轴系振动模型,通过引入转子间的位移约束,由Lagrange方程导出了不对中轴系系统的振动方程.仿真研究表明:由于不对中的存在,轴系横向振动是强非线性、非定常、同时含有自激励、参数激励和外激励的三自由度振动系统;由于从动轴与主动轴的不对中,导致了转轴间的运动约束,使轴系横向振动系统比Jeffcott转子动力学模型所描述的振动系统少了一个自由度.随着偏角不对中量、转轴质量比的变化,系统出现周期、概周期、混沌运动特征.不对中轴系处于概周期运动时,呈现出自激振动特征.其结果可为旋转机械故障诊断、轴系对中及设备的安全运行提供更为准确的理论参考.The dynamic model of the rub-impact rotor system with an angular misalignment was set up. By the displacement constraints between rotors, the dynamic equations were developed on the Lagrange method. Simulations show that the rotor system＇s low frequencies with large amplitude are 1/2 and 1 octave spetrums. If the angular mis- alignment is small, the displacement is small as the angular becomes large. The oil-film force and rub-impact force re- strain the vibration amplitude and increase the stability region of the system. The results provide important theoretical references for fault diagnosis, shaft alignment and the safety operation.

关 键 词：轴系 偏角不对中 非稳态油膜力 碰摩力 

分 类 号：O322[理学—一般力学与力学基础] TH133.33[理学—力学]