摘要
根据转子动力学理论,建立了具有突变激励频率特性的Jeffcott转子力学模型及动力学方程。通过解析方法得到了激励频率突变后的转子系统振动解析表达式,并分析了激励频率突变前后稳态振幅之间的关系及激励频率突变对轴心最大位移的影响,定义了激励频率突变后的暂态过程时间,确定了碰摩参数区域。结论表明,激励频率突增的刚性转子系统及激励频率突减的柔性转子系统均会导致转子系统振动幅度增大,暂态过程时间与系统阻尼、刚度突变时的轴心位置及系统工作频率有关,碰摩参数区域随着激励频率突增幅度及质量偏心距的增大而增大。
Dynamical model and equation of Jeffcott rotor system with sudden change frequency were established based on rotor dynamics. Vibration expression of rotor system with sudden change frequency was obtained through analytical method. Relationship between the steady--state amplitudes fore and after frequency suddenly changed was analyzed, and the influence of sudden change frequency on maximal axis displacement was also studied. Transient time after frequency suddenly changed was defined and rubbing parameters region was determined. The conclusion indicates that sudden change frequency can cause the magnification of rotor amplitude; rigid rotors system with sudden increased frequency and flex rotors system with sudden reduced frequency have huge influence on steady--state amplitude; transient time is related with system damp, operating frequency, and axis azimuth when frequency suddenly changed; rubbing parameters region will increase with mass eccentricity enhancing.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2008年第8期985-989,1007,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50275024)
辽宁省教育厅基础研究计划资助项目(2005326)
关键词
转子
动力学
激励频率
突变
碰摩
rotor
dynamics
frequency
sudden change
rubbing
