针对柴油机振动信号的瞬时非线性特点, 提出采用柴油机振动信号的本征模函数( IMF) 分量进行特征频带识别的新方法。将柴油机振动信号经经验模态分解, 并去掉主要干扰因素所对应的IMF分量, 再将剩余IMF分量进行重构得到柴油机振动信号-For instantaneous nonlinear characteristics of vibration signals of diesel engine, the diesel engine vibration signal of the intrinsic mode function (IMF) component is used to identify the characteristic frequency band of the new method. The diesel engine vibration signal by the empirical mode decomposition, and remove the main interference factors of the IMF component, then the rest of the IMF component refactoring diesel engine vibration signal