摘要
针对在集合经验模态分解(EEMD)降噪应用过程中出现的模态混叠问题,采用排列熵与经验模态分解(EMD)相结合的方法,对振动信号进行降噪。引入排列熵概念,利用排列熵对EEMD分解得到的固有模态函数(IMF)进行随机性检验,形成新的EEMD降噪处理方法。仿真试验结果表明,该方法能有效提高信噪比,运算效率也得到了较大程度的提升。
Aiming at the modal aliasing problem appears in emsemble empirical mode decomposition (EEMD) de - noising application, the method combing permutation entropy and empirical mode decomposition (EMD) is proposed to de - noise the vibration signal. The concept of permutation entropy is introduced and used in randomness test of intrinsic mode function (IMF) decomposed by EEMD, thus the new EEMD de - noising method isformed. The simulation results show that the method can effectively improve the signal - noise ratio; and greatly raise the operation efficiency.
出处
《自动化仪表》
CAS
2016年第9期14-17,共4页
Process Automation Instrumentation
关键词
经验模态分解(
EMD)
集合经验模态分解(
EEMD)
辅助噪声
降噪
模态混叠
IMF
排列熵
仿真
Empirical mode decomposition (EMD)
Ensemble EMD ( EEMD)
Auxiliary noise
De - noising
Modal aliasing
Intrinsic mode function (IMF)
Permutation entropy
Simulation