AR模型在爆破震动信号频谱分析中的应用

爆破震动信号的频谱分析以傅氏变换为基础的经典谱估计方法为主,该方法存在方差性能差、易产生虚假峰值、谱曲线起伏大等缺点。AR模型谱估计方法计算精确度高、且简单,并能弥补经典谱估计在信号分析中的不足。采用经典、AR模型谱估计方法对不同类型的工程实测爆破震动信号进行频谱分析,其中以AR模型谱估计方法得到爆破震动信号的频谱曲线平滑、方差小、主频明确,且主频附近无虚假峰值,表明AR模型现代谱估计比经典谱估计在爆破震动信号的频谱分析中更具优越性。

Application of AR Model in Spectrum Analysis of Blasting Vibration Signals

The method of spectrum analysis of blasting vibration signal is a classical spectral estimation method mainly based on Fourier transform,which has some disadvantages,including poor performance of variance,easier to produce false peak and high curve fluctuation. While AR model spectrum estimation method has the advantages of high accuracy and simplicity,and makes up for the shortcomings of the classical spectrum estimation in signal analy-sis. The spectrum analysis of the vibration signals of different types of projects was carried out through classical and AR model spectral estimation method. Results show that spectrum curve of blasting vibration signal with AR model spectrum estimation method has the following characteristics such as smoothing,small variance,clear dominant fre-quency and no false peak near the dominant frequency. Therefore,the AR model modern spectrum estimation method is more superior to the classical spectral estimation method on Spectrum analysis of blasting vibration signals.