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8.[O]由于不对中(不同轴)产生的振动有下列几点特征: (1)振动频率f 一般为2倍回转频率f_r,并会有f_r及3f_r等次谐波; (2)振幅 一般是大体一定,与转速增减无关; (3)方向 容易产生轴间振动,或者存在轴向振动大于径
8. [O] Vibration due to misalignment (different axes) has the following characteristics: (1) The vibration frequency f is generally 2 times the rotation frequency f_r and there will be sub-harmonics such as f_r and 3f_r; (2) Amplitude is generally generally constant, and has nothing to do with the speed increase or decrease; (3) Direction prone to vibration between the shaft, or the existence of axial vibration is greater than the diameter