时频分析方法在燃烧音频信号分析中的应用研究

Application of Time Frequency Analysis Method in Combustion Audio Signal

目前基于燃烧音进行的火灾预测、分析研究还较少。分析了燃烧音的产生机理,根据燃烧音的物理特性,认定物质燃烧时产生的燃烧音可以近似为信号中的低频冲击信号,并利用连续小波变换(CWT)在分析冲击信号方面的优势,提出了基于CWT的时频分析方法对燃烧音信号进行谱分析,最后通过信号仿真,比较了该方法与短时傅里叶变换(STFT)和Wigner-Ville分布(WVD)方法,证实了CWT方法在分析微弱燃烧音信号的可靠性和有效性。

The fire prediction and analysis based on combustion audio are rare.According to the physical characteristics of combustion audio,the combustion audio can be approximated as low frequency impact signal.A new method for combustion audio signal analysis based on continuous wavelet transform（CWT） which is useful in analyzing the spectrum of impact signals is proposed,whose reliability and effectiveness are confirmed by comparing CWT with short time Fourier transform（STFT） and wigner-ville distribution（WVD）.