沥青路面结构力学响应信号处理方法研究

Research on Processing Method of Mechanical Response Signal in Instrumented Pavement

力学响应信号的有效处理是获得沥青路面结构力学响应的可靠保障。为提高力学响应信号处理方法的有效性,基于时频域理论提出了低通滤波和小波滤波的信号降噪方法,同时提出了基于最小二乘的基线归零方法。新方法与原方法的对比研究结果表明:基于频域的低通滤波和小波滤波对信号的降噪效果均好于原移动平均法;推荐使用效果较稳定的小波滤波5层分解对信号降噪;基于最小二乘的基线归零方法可有效去除信号的零点漂移现象,解决了原方法主观性的问题。

The effective processing to the mechanical response signal is a reliable guarantee to obtain the mechanical response of the asphalt pavement structure.In order to make the mechanical response signal processing method more effective,based on the time-frequency domain theory,two types of signal denoising methods are proposed:low-pass filtering and wavelet filtering,and a baseline zeroing method based on least squares is also proposed.The comparison between the new method and the original method shows that the low-pass filtering and wavelet filtering have better noise reduction effects than the original moving average method.It is recommended to use wavelet filtering with 5-level decomposition to reduce the noise of the signal,and its effect is stable.The baseline zeroing method based on least squares can effectively remove the zero drift of the signal and eliminate the subjectivity of the original method.