基于零空间追踪和SWT的柴油机信号降噪研究

摘要

为减少柴油机振动信号的噪声干扰，提取有用的信息，提出了一种基于零空间追踪算法和同步压缩小波变换相结合的组合降噪方法，利用压缩小波对主频信号精细重构的优点与零空间追踪算法的自适应分解的特点对信号进行降噪处理。该方法相比 EMD 更加适应柴油机振动信号特点，仿真和实例信号表明，该方法取得了较好的降噪效果。%In order to reduce the noise of diesel engine signal and extract the useful information ,a method consisted of null space pursuit (NSP) and synchrosqueezed wavelet transform (SWT ) was proposed .The denoising of signal was conducted ac‐cording to the characteristics of SWT accurate reconstruction of signal main frequency and NSP adaptive decomposition .Com‐pared with EMD method ,the proposed method was more suitable for the vibration signal of diesel engine .The simulation and testing results show that the method has a good denoising effect .