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研究了弹性波在不同参数介质中传播的基本理论,建立了基本动力学方程式,并根据其边界条件和连续性条件求得波的反射系数方程。接收波则综合携带了地基内部特性信息,可通过这些信息研究地基内部不同部位参数的相差程度及位置。小波分析可以对指定频带和时间段内的信号成分进行分析,在时域和频域具有良好的局部化性质。可以准确地抓住瞬变信号的特性,对频率成分采用逐渐精细的时域或频域取样步长,从而聚焦到信号的任意细节。运用小波的方法分析接收到的超声波的频谱结构,就能判断地基的内部参数。
The basic theory of elastic wave propagating in different parameters is studied. The basic dynamic equation is established, and the wave reflection coefficient equation is obtained according to its boundary conditions and continuity conditions. The received wave is integrated with the information of the internal characteristics of the foundation. Based on these information, the degree and position of the parameters of different parts of the foundation can be studied. Wavelet analysis can analyze the signal components in the specified frequency band and time period, and has good localization in time domain and frequency domain. You can accurately grasp the characteristics of transient signals, the frequency component of the use of increasingly sophisticated time-domain or frequency-domain sampling steps, which focus on any details of the signal. Using the wavelet method to analyze the spectral structure of the received ultrasonic wave, the internal parameters of the foundation can be judged.