为了测试论文(An improved method for restraining the end effect in empirical mode decomposition and its applications to the fault diagnosis of large rotating machinery)提到的ISBM延拓和MM(镜像)延拓法的区别,按着论文流程,使用G.Rilling程序默认的镜像法对函数X =cos(2*pi*(30*T+6*T.*T)-196*pi/180)+2*cos(2*pi*T-196*pi/180)进行emd,效果和论文中所述的mm算法结果差距很大!不解。。。。我感觉是不是门限设置不合理?