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中文摘要：
在单跨转子模型实验台上,人为松动轴承座一侧的紧固螺栓,造成支承结构的弹性刚度减弱,模拟实际工程中存在的旋转机械松动故障。利用三维谱阵图、小波尺度图和轴心轨迹图对采集到的带有松动故障的竖直方向振动信号进行了分析。分析结果表明,在一阶临界转速附近会产生比较混乱的低频分量,出现了复杂的非线性现象,如出现拟周期、分岔等现象。在超过2倍临界转速后低频成分趋于稳定。
英文摘要：
A model test rig of single-span rotor system was set up. By loosing tap bolts at one side of bearing housing to weaken elastic stiffness of supporting structure, the pedestal looseness faults existing in rotating machinery were simulated. The collected vibration signals with looseness faults at vertical direction have been analyzed by the 3-D waterfall spectrum, wavelet scalogram and trajectory. The analytical results showed that the chaotic low frequency components occurred near the first critical speed and the complicated nonlinear phenomena appeared, such as quasiperiodic motions and bifurcations etc. When the rotational speed exceeded double critical speed, the low frequency components tended towards stability.
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Synchronization of two non-identical coupled exciters in a non-resonant vibrating system of linear m
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