基于MEEMD的内燃机机体活塞敲击激励与燃烧爆发激励分离研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (6) : 109-113.

论文

基于MEEMD的内燃机机体活塞敲击激励与燃烧爆发激励分离研究

郑旭，郝志勇，卢兆刚，杨骥

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Separation of the Piston-slap and Combustion Shock Vibration Components via MEEMD Method

Zheng Xu, Hao Zhi-yong, Lu Zhao-gang, Yang Ji

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摘要

提出了一种改进的集总平均经验模态分解（MEEMD）方法，并阐述了其实现过程。通过仿真实验，验证了MEEMD是一种更为优秀的自适应信号分解方法，不仅抑制了经验模态分解（EMD）的模态混叠问题，而且消除了集总平均经验模态分解（EEMD）中的，非标准IMF分量、模态分裂和白噪声残余等问题。将MEEMD应用到内燃机振声信号处理中，以某柴油机为研究对象，对其机体上的振动信号进行MEEMD分解，分离其中的活塞敲击引起的机械激励成分与燃烧爆发激励成份，诊断主要振动源。

Abstract

A modified ensemble empirical mode decomposition (MEEMD) is proposed in this paper, and its basic principles are discussed. The numerical simulation shows that MEEMD is a better adaptive signal decomposed method, which not only restrains the disadvantage of mode mixing problem of the EMD method, but also overcomes the non-IMFs, mode splitting and noise residue problems. The MEEMD method is then used to analyze the vibration signal of the block of a diesel engine. The analysis achievements show that the mechanical shock component originating from piston-slap could be successfully separated from the combustion shock component, and the dominate vibration sources could be obtained.

导出引用

郑旭;郝志勇;卢兆刚;杨骥. 基于MEEMD的内燃机机体活塞敲击激励与燃烧爆发激励分离研究[J]. 振动与冲击, 2012, 31(6): 109-113

Zheng Xu;Hao Zhi-yong;Lu Zhao-gang;Yang Ji. Separation of the Piston-slap and Combustion Shock Vibration Components via MEEMD Method[J]. Journal of Vibration and Shock, 2012, 31(6): 109-113