【摘要】 在基桩及结构物质量的敲击-回波法检测过程中,由传感器采集的信号里除反映了被测点的速度响应外,还总是含有传感器固有特性引起的成份。首先利用数值模拟软件FLAC3D对不含传感器的桩顶速度响应进行数值模拟,再与传感器特性进行合成,得到含有传感器特性的桩顶速度响应;然后利用小波分析,研究了传感器对速度响应的影响;最后,提出了一种新的抑制传感器影响的方法——小波抑制法,结果表明:小波分析能有效地抑制速度响应中传感器的影响。更多还原

【Abstract】 In the testing of impact-echo method in pile or other structure, the signals are got by velocity or acceleration transducers .The signals include the velocity response of the observing point and the influence of transducer behavior . First of all , the velocity response of pile are simulated by the numerical simulation software FLAC-3D .Secondly, the velocity response comprising the transducer behavior are gained by signal synthesis. And a new time-frequency domain analysis method, wavelet analysis, is introduced to study the influence of transducer on the velocity response. Finally ,a new suppressing method, wavelet suppressing method, for suppressing the influence of transducer is put forward. In order to validate the new suppressing method , several examples are given; and the results indicate that the new suppressing method is practicable.更多还原