波导器中声发射信号传播规律研究

声发射信号在波导器中的传播规律是声发射预测煤岩动力灾害技术的一个重要因素。根据声发射传播的相关理论,采用标准激震源法,考察了不同尺寸波导器中声发射响应情况,采用DEWE3010虚拟仪器系统分析了声发射信号时域波谱及频域谱变化规律等,在此基础上统计分析了波导器尺寸、波导器与煤岩块接触程度,以及波导器弯曲程度对声发射信号的事件数、事件及振幅变化率的影响。试验结果可为声发射预测煤岩动力灾害提供技术指导。

Study on Propagation Law of Acoustic Emission Signal in Wave Guider

The propagation law of acoustic emission signal in the wave guider is an important factor for the prediction of dynamic disaster of coal and rock.In this paper,investigation was made on the response of acoustic emission in the wave guiders of different size according to relevant propagation theories of acoustic emission and by applying a standard focal shock source,and systematic analysis was done on the variation law of the time domain spectrum of the acoustic emission signal and that of the basic frequency of the frequency domain spectrum,on this basis, we obtained,by statistical analysis,the size of the wave guider,the contact degree of the wave guider and coal and rock lumps as well as the influence of the wave guider's bending degree upon the event number of the acoustic emission signals and the variation rate of the event and amplitude.The test results can provide technical guidance for the prediction of coal-rock dynamic disaster with acoustic emission.