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扭转振动可以看作是匀速轴转动的相位调制．如果可能从回转轴上取出回转编码信号，在一定条件下，此信号的相位解调就表示轴的扭转振动．进行相位解调的有效方法是使用ＦＦＴ分析仪将实信号变为解析信号，而后将其幅值和相位调制分量分解出来．利用希尔伯特变换技术进行幅、相解调，这在通讯领域应用较为广泛．而将其用于扭转振动的检测和分析，目前来说还不多见．为此，我们设计了一套实验装置，利用相应的设备和开发软件进行了一系列实验，得到了一些数据和结果．由于整个解调过程是数字化的．因而具有精度高、应用范围广、适应性强等一系列传统模拟方法所不可比拟的优点，并摒弃了复杂、昂贵而精度有限的扭振传感器．
Torsional vibration can be seen as a phase modulation of constant-axis rotation. If it is possible to remove the rotary encoder signal from the rotary shaft, under certain conditions, the phase demodulation of this signal indicates the torsional vibration of the shaft. An effective method of phase demodulation is to use an FFT analyzer to transform the real signal into an analytic signal and then to decompose its amplitude and phase modulation components. The use of Hilbert transform technology amplitude, phase demodulation, which is widely used in the field of communications. The use of torsional vibration for detection and analysis is rare at present. To this end, we designed a set of experimental devices, using the appropriate equipment and software development conducted a series of experiments, got some data and results. Because the entire demodulation process is digital. Therefore, it has the advantages of high precision, wide range of applications, strong adaptability and a series of traditional simulation methods, and has abandoned the complicated, expensive and limited torsional vibration sensor.