复信号分析在反射波初至时刻判断中的应用

Complex Signal Analysis and Its Application in Judging the Arriving Moment of Reflected Wave

节理产状应力波反演时,关键问题在根据测试振动信号判断出节理面反射纵波初至时刻。借助H ilbert变换可实现信号的复信号分析,人工合成振动信号的复信号分析说明了瞬时振幅、瞬时频率二者在反射波识别方面均有很好的效果,用节理岩体模拟实验测得的信号分析表明,即使面波干扰严重,瞬时频率还是能有效判断节理反射纵波初至时刻。

When stress wave is used to inverse joint＇s attitude, the key problem is judge the initial arriving moment of reflected P-wave from the tested vibration signal. Through Hilbert transform we can implement a signal＇s complex signal analysis. A synthesized vibration signal＇s complex signal analysis demonstrates that both instantaneous amplitude and instantaneous frequency are efficient in identifying the reflected wave. A simulating jointed rock masses has been made and the complex signal analysis has been used to analyze the vibration signal on the testing spot. Despite the Rayleigh wave＇s serious interference, the initial arriving moment of reflected wave still can be judged from instantaneous frequency efficiently.