摘要
本文提出了一种基于样条插值的局部均值分解(LMD)法剔除趋势项的途径,并研究了其在发动机瞬时转速信号处理中的应用。通过与常用的最小二乘法(LSM)和小波分解法(WM)进行比较,表明了基于样条插值的局部均值分解法在去除信号中趋势项的问题上,具有剔除与真实信号频谱重叠的趋势项的优势。这对提高发动机瞬时转速信号预处理精度具有重要意义。
In this paper,the local mean decomposition（LMD） method based on the spline interpolation is researched into removing the linear trends of signal and applied in the engine instantaneous speed signal processing.Compared with the commonly used least squares method（LSM） and wavelet decomposition method（WM）,this mothod has more advantages in the issue of the linear trend of signal.It could remove the trend of overlap with the true signal spectrum trend.This is of great significance to improve the accuracy of the engine instantaneous speed signal preprocessing.
出处
《软件》
2012年第3期15-18,共4页
Software
关键词
趋势项
局部均值分解法
最小二乘法
小波分解法
瞬时转速
trends
local mean decomposition
least squares method
wavelet decomposition
instantaneous speed
