【摘要】 为摆脱参数设置对到时拾取算法准确性和适应性的影响,依据波形的起伏特征提出一种无需事先设置参数的到时拾取方法,该方法以信号包络线趋势变化为依据,首先通过功率谱密度图确定包络线的隐周期,然后通过STL分解获得包络线趋势变化曲线,最后根据MK突变检测自动确定AE信号到时。仿真试验结果表明,在不同强度和不同频率的背景噪音环境下使用本文方法均表现出较高的拾取性能,而应用较多的STA/LTA法在拾取性能上明显表现出对参数设置的依赖。在广西盘龙铅锌矿地压监控实测信号中的应用结果表明,本文方法能准确判别监测信号中有无声发射并准确拾取到时。该方法为矿山地压实测信号的到时拾取提供了一种新的思路。更多还原

【Abstract】 In order to get rid of the impact of parameter setting on the accuracy and adaptability of arrival-time pickup algorithm, an arrival-time pickup method without setting parameters in advance was proposed according to the fluctuation features of the waveform. This method is based on the trend change of the signal envelope. Firstly, the hidden cycle of the envelope is determined by the power spectral density diagram, and then the trend change curve of envelope is obtained by STL decomposition. Finally, the arrival time of AE signal is automatically determined according to MK mutation detection. It is found from the simulation test that the proposed method shows high pickup performance in the environment background with noises of different intensities and frequencies, while the widely used STA/LTA method has pickup performance obviously depending on parameter settings. The application of this method in measuring signals during the ground pressure monitoring for Panlong Lead-Zinc Mine in Guangxi Zhuang Autonomous Region shows that it can accurately distinguish the silent emission of signals in the monitoring and accurately pick up the arrival time. This method provides a new idea for picking up the arrival time of measured signal of mine ground pressure.更多还原