考虑摆振的裂纹转子的振动分析

以刚性支撑的水平Jeffcott裂纹转子为研究对象,在考虑了盘的摆振运动对裂纹转子运动的影响后,建立了裂纹转子运动微分方程,并采用数值计算及FFT等方法进行仿真模拟。模拟结果表明:在盘的摆振响应中具有与弯曲振动相同的频率成分,这些频率成分的相对幅值大小与弯曲振动的较为相似;摆振响应中还出现了弯曲振动响应所没有的高频分量,当转速增加时,尽管这种高频分量会有所减小,但仍会在频谱图中清晰可见;随着裂纹深度的增加,摆振响应中出现了更高倍频的频率成分。这对于裂纹转子的故障诊断具有参考价值。

Analysis on Swing Vibration of Cracked rotor

The differential equations are established to study the swing vibration of a horizontal cracked rotor with rigid supports by using numerical simulations and FFT. The simulated results show that the frequency components in the resonance of swing vibration are the same as those of bending vibration in certain frequency range,ang the relative magnitudes of these frequency components of the both are also very found similar. In addition, some higher frequency components appear in the resonance of swing vibration, which are not found in the resonance of bending vibration. Although the magnitudes of these higher frequency components become smaller as the rotating rate is increased, they can be still apparently observed. As the crack depth is increased, the frequency components of higher multiple orders will appear in the resonance of swing vibration. These will be helpful in diagnosing the fault of cracked rotors.