【摘要】 爆破震动信号是典型的非平稳信号,其处理方法已由单纯的频域分析过渡到时频联合分布分析。在讨论Fourier变换(FT)和短时Fourier变换(STFT)不足的基础上,论述了基于连续小波变换(CWT)和离散小波变换(DWT)在爆破震动信号分析中的应用。作为一种严格的时频分析方法,论文尝试利用二次型时频分布来进行爆破震动信号的时频联合分析;通过几种二次型时频分布的对比分析,认为CWD在具有较强的时频聚集性的同时又较好地对交叉项进行了抑制,适合于进行爆破震动信号的时频分析。更多还原

【Abstract】 The methods for processing of blasting vibration signals, typical random vibration signals, have been changed from frequency domain to time-frequency analysis. On the basis of discussing the drawbacks of the FT and STFT, the use of CWT and DWT for processing the blasting vibration signals is expatiated. The quadratic time-frequency distribution as a precise time-frequency analysis method is tried to analyze the blasting vibration signals. With the comparison between several time-frequency distributions, CWD is considered to be a perfect distribution, which is very suitable to time-frequency analysis of blasting vibration signal, and both has high time-frequency resolution and can compress cross terms effectively.更多还原