声发射技术在砂轮回转实验破碎识别中的应用

采用一种新型砂轮破碎状态信号检测方法——声发射（AE）技术，通过采集环境背景、空转、空载和负载AE信号，并对信号进行时频域研究。对比砂轮破碎后和破碎前AE信号特征，时域信号特征电压值增大了2.5倍、能量谱峰值增大了4倍、均方根值（RMS）增加了1.17倍，频域信号经快速傅里叶转换（FFT）后得到了一个高频电压信号。研究结果表明:声发射技术优于目前常用的振动法、音量法和光电法，更适合用于砂轮回转实验破碎识别。 

Application of acoustic emission in the breaking signal recognition of grinding wheel rotation test

Acoustic emission (AE) technology, a new method to detect the breaking signal of grinding wheel rotation test is introduced.The time and frequency domain of the signals are studied by collecting the AE signals of background, idling, no-load, loading.Comparison the characteristic AE signals of grinding wheel after crushing and crushing before, we find that the characteristic voltage value of time domain signal increases by 2.5times, the peak value of the energy spectrum increases by 4times, the RMS value increases by 1.17 times and a high frequency voltage signal is obtained by means of fast Flourier transform (FFT) of the frequency domain.The results show that the acoustic emission technology is more suitable for the field of grinding wheel breaking test, which is superior to the commonly used vibration method, volume method and photoelectric method.