scholarly journals An Improved Empirical Mode Decomposition Method for Vibration Signal

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaohan Liu ◽  
Guangfeng Shi ◽  
Weina Liu
Keyword(s):  
Signal Processing ◽  
Power Spectrum ◽  
Empirical Mode Decomposition ◽  
Decomposition Method ◽  
Vibration Signal ◽  
Vibration Monitoring ◽  
Blasting Vibration ◽  
Vibration Signals ◽  
Mode Decomposition ◽  
Empirical Mode Decomposition Method

With the development of electronic measurement and signal processing technology, nonstationary and nonlinear signal characteristics are widely used in the fields of error diagnosis, system recognition, and biomedical instruments. Whether these features can be extracted effectively usually affects the performance of the entire system. Based on the above background, the research purpose of this paper is an improved vibration empirical mode decomposition method. This article introduces a method of blasting vibration signal processing—Differential Empirical Mode Decomposition (DEMD), combined with phosphate rock engineering blasting vibration monitoring test, and Empirical Mode Decomposition (EMD) to compare and analyze the frequency screening of blasting vibration signals, the aliasing distortion, and the power spectrum characteristics of the decomposed signal. The results show that compared with EMD, DEMD effectively suppresses signal aliasing and distortion, and from the characteristics of signal power spectrum changes, DEMD extracts different dominant frequency components, and the frequency screening effect of blasting vibration signals is superior to EMD. It can bring about an obvious improvement in accuracy, and the calculation time is about 4 times that of the EMD method. Based on the ground analysis of ground motion signals, this paper uses the EMD algorithm to analyze measured ground blast motion signals and study its velocity characteristics and differential time, which provides a new way of studying motion signals.

Improving empirical mode decomposition for vibration signal analysis

2016 ◽  
Vol 231 (12) ◽  
pp. 2223-2234 ◽  
Author(s):  
Mousa Rezaee ◽  
Amin Taraghi Osguei
Keyword(s):  
Empirical Mode Decomposition ◽  
Decomposition Method ◽  
Vibration Signal ◽  
Mode Decomposition ◽  
Empirical Mode Decomposition Method ◽  
Local Mean ◽  
The Common ◽  
Vibration Signal Analysis ◽  
Overshoot And Undershoot ◽  
Better Than

In this paper, the empirical mode decomposition as a signal processing method has been studied to overcome one of its shortcomings. In the previous studies, some improvements have been made on the empirical mode decomposition and it has been applied for condition monitoring of mechanical systems. These improvements include elimination of mode mixing and restraining of end effect in empirical mode decomposition method. In this research, to increase the accuracy of empirical mode decomposition, a new local mean has been proposed in the sifting process. Through the proposed local mean, the overshoot and undershoot problems in defining the local mean of common algorithm are alleviated. Meanwhile, it is capable to separate the components with close frequencies. Through the analysis of simulated signals via the new algorithm, it is shown that the accuracy is improved. Finally, empirical mode decomposition-based fault diagnosis approach has been applied to a vibration signal obtained from a faulty gearbox. The results show that the proposed method can resolve the effects of damage in vibration signals better than the common empirical mode decomposition method and helps for the isolation and localization of the fault.

The Application Research on Signal Processing Technology in Non-Destructive Test Technology

2013 ◽  
Vol 380-384 ◽  
pp. 3474-3478
Author(s):  
Di Jin Guan
Keyword(s):  
Signal Processing ◽  
Nondestructive Test ◽  
Empirical Mode Decomposition ◽  
High Precision ◽  
Decomposition Method ◽  
Processing Technology ◽  
Detection Techniques ◽  
Mode Decomposition ◽  
Test Technology ◽  
Empirical Mode Decomposition Method

The high-precision instruments must be tested to ensure the accuracy and the normal use of the instrument in the application. Traditional detection techniques damage the instrument. So, researching for a technology which has no destruction on high precision instrument is important. This paper puts forward a new ultrasonic nondestructive test technology of precision instruments through empirical mode decomposition method of modern signal processing technology and ultrasonic nondestructive test technology. The first part describes the shortcomings of modern signal processing technology--Fourier and wavelet analysis and the advantage of empirical mode decomposition method. The second part establishes the mathematical model of ultrasonic nondestructive test technology. It also establishes empirical model to enhanced signal and noise ratio using the self-adaptivity of the empirical mode decomposition. It also extracts Intrinsic Mode Function (IMF) of ultrasonic nondestructive test technology using EMD and Hilbert transform signal processing method. Finally, it gets Nonlinear and non-steady-state frequency power spectrum which provides a reliable theoretical basis for the study of nondestructive test technology.

Fault Diagnosis of Transmission Based on EMD and Fractal Technology

2014 ◽  
Vol 926-930 ◽  
pp. 1712-1715
Author(s):  
Zhen Shu Ma ◽  
Chao Liu ◽  
Hua Gang Sun ◽  
Zhi Chuan Liu
Keyword(s):  
Fractal Dimension ◽  
Fault Diagnosis ◽  
Noise Reduction ◽  
Empirical Mode Decomposition ◽  
Decomposition Method ◽  
Great Influence ◽  
Vibration Signal ◽  
Fault Type ◽  
Mode Decomposition ◽  
Empirical Mode Decomposition Method

As a result of the presence of noise in the measured vibration signal has a great influence on the results of calculation of fractal dimension, Therefore the empirical mode decomposition method for noise reduction of gear vibration signal is used, calculation fractal dimension, extraction fault feature of Gear in different conditions. The measured results show that: Different fault states have different fractal dimension, we can judge the fault type of gear effectively by the fractal dimension.

scholarly journals Gearbox damage identification using Ensemble Empirical Decomposition method

2019 ◽  
Vol 252 ◽  
pp. 06005
Author(s):  
Kamil Jonak ◽  
Arkadiusz Syta
Keyword(s):  
Comparative Analysis ◽  
Empirical Mode Decomposition ◽  
Decomposition Method ◽  
Damage Identification ◽  
Ensemble Empirical Mode Decomposition ◽  
Physical Damage ◽  
Vibration Signals ◽  
Characteristic Frequencies ◽  
Mode Decomposition ◽  
Empirical Mode Decomposition Method

In this article, we have conducted a comparative analysis of vibration signals from helicopter aircraft propulsion transmissions, registered on an industrial research stand. We compared acceleration vibrations in the case of gears without physical damage and gears with one tooth missing. Based on recorded signals, we determined the values of indicators based on the statistical properties of signals and compared them with each other. For a more exact comparison, the distribution of the tested signals to the empirical modes using the EEMD (Ensemble Empirical Mode Decomposition) method was performed. This allows to treat individual modes as components of a signal at specific frequencies, and also prevents mixing of modes in individual components, which may take place in the classic EMD analysis. It should be noted that individual modes may correspond to characteristic frequencies for the operation of the transmission. When comparing the values of the most frequently used indicators, modes/frequencies in which the damage was most visible were indicated.

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