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为研究转子系统耦合故障特性,采用有限元方法建立了含有横向裂纹、转静碰摩的非线性转子动力学模型。首先研究了不同转速下裂纹、碰摩单一故障下转子系统的振动响应,其次研究了两种故障耦合情况下系统的振动响应特征。采用波形图、FFT谱图、瞬时频率和Hilbert-Huang时频谱(HHS)相结合的方法对故障转子振动信号进行了分析。分析结果表明:运用多种时频分析相结合的方法可以较为全面地了解转子的故障特征,裂纹转子在1/5、1/3临界转速时会发生较为明显的5X、3X谐波,且裂纹的产生会导致响应幅值增大,从而引起更为严重的碰摩。
In order to study the coupling failure characteristic of rotor system, a nonlinear rotor dynamic model with transverse crack and static friction is established by finite element method. Firstly, the vibration responses of the rotor system under single failure with different rotational speed and friction are studied. Secondly, the vibration characteristics of the system under two kinds of fault coupling are studied. The fault rotor vibration signals were analyzed by using the combination of waveform, FFT spectrum, instantaneous frequency and Hilbert-Huang time-frequency spectrum (HHS). The analysis results show that the fault characteristics of the rotor can be understood more comprehensively by using a combination of time-frequency analysis methods. The 5X, 3X harmonics of the cracked rotor at 1/5 and 1/3 critical speed are obvious, and the crack The resulting increase in response amplitude, causing more serious rubbing.