【摘要】 爆破振动信号的研究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)在爆破振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振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的对交叉项进行了抑制,适合于进行爆破振动信号的时频分析。更多还原

【Abstract】 At present time,the investigation methods of blasting vibration signals have been gradually changed from pure frequency domain analysis to time-frequency analysis. Based on the drawbacks of FFT and STFT, the applications of continuous wavelet transform (CWT) and discrete wavelet transform (DWT) in analyzing blasting vibration signals are discussed. And the quadratic time-frequency distribution as a precise time-frequency analysis method is tried to deal with the blasting vibration signals. Through comparing several kinds of time-frequency distributions, CWD is consideredas a perfect distribution, which is very fit for time-frequency analysis with high resolution and can compress cross terms effectively.更多还原