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Propagation Characteristics of Acoustic Emission Signal in Rotor System

机译：转子系统中声发射信号的传播特性

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摘要

The propagation characteristics of acoustic emission (AE) signals in different structures are very important for condition monitoring and fault diagnosis. A bearing-shaft-rotor system is adopted to analyze propagation characteristics of AE signals, such as reflection, transmission, attenuation, energy distribution, waveform and frequency characteristics. 150 kHz AE signal and lead-break signal are applied to the shaft as incident signals respectively, and their propagation characteristics in the whole system are studied. It was found that the main influencing factor of reflection characteristics was the propagation of AE signals in the shaft, and the main influencing factor of attenuation was the propagation of AE signals in bearings and shafts. In frequency domain, due to the influence of frequency dispersion and the natural frequency of the experimental rotor system, there are many peak frequencies in the signal spectrum besides the peak of incident frequency.
机译：不同结构中声发射（AE）信号的传播特性对于条件监测和故障诊断非常重要。采用轴承轴转子系统来分析AE信号的传播特性，例如反射，传输，衰减，能量分布，波形和频率特性。将150kHz AE信号和铅断线信号分别施加到轴作为入射信号，研究了整个系统中的传播特性。结果发现反射特性的主要影响因素是轴中的AE信号的传播，并且衰减的主要影响因素是AE信号在轴承和轴中的传播。在频域中，由于频率分散的影响和实验转子系统的固有频率，除了入射频率的峰之外，信号谱中存在许多峰值频率。

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