摘要
建立含裂纹Jeffcott转子的动力学运动方程。针对裂纹深度对转子系统动态响应的影响及转子盘摆振响应的特点进行仿真计算和试验研究。数值仿真表明 ,对于较浅的裂纹 ,系统响应为周期性运动 ,在某些转速下会出现倍周期运动 ,同时还出现各种倍频分量。此时的摆振运动常包含激振频率的倍频成分。当裂纹较深时 ,盘的摆振运动与横向振动都会出现各种非协调响应。试验结果表明 ,当轴上存在裂纹时 ,盘的横向振动响应和摆振响应中都会出现高次谐波分量 ,这些分量虽然从频率成分上讲是相同的 ,但各分量的大小有明显差异。这些结论对于转子裂纹故障的监测与诊断具有新的意义。
Applying the model of breath crack and considering the variation of moment of inertia at the crack, the motion differential equations of a horizontal cracked Jeffcott rotor were deduced. Nonlinear dynamic response and swing vibration of the system were theoretical and experimental investigated. From numerical simulation, it is found that when crack is sallow the response of the system is periodic motion, at some rotating speeds, it will appear periodic doubling motion and harmonic components. When crack is deep, it will appear many nonlinear responses. On the other hand, there will appear harmonic components in swing response of disk. The experiment of cracked rotor with a single disk was conducted. The responses were obtained at different rotating speed and different crack depth. From experimental results, it is obvious that when crack exists, there will be high exponent harmonic components in responses of swing vibration and transverse oscillation. Although the frequency components of transverse oscillation are the same as swing vibration, but the amplitudes of two cases are apparently different.
出处
《机械强度》
CAS
CSCD
北大核心
2003年第1期1-4,8,共5页
Journal of Mechanical Strength
基金
航空科学基金资助项目 (0 0C530 2 4 )~~
关键词
裂纹转子
非线性响应
数值模拟
故障诊断
转子动力学
Cracked rotor
Nonlinear response
Numerical simulation
Failure diagnostic
Rotor dynamics
