Morlet Wavelet UDWT Denoising and EMD based Bearing Fault Diagnosis
Journal Title: Elektronika - Year 2013, Vol 17, Issue 1
Abstract
Bearing Faults in rotating machinery occur as low energy impulses in their vibration signal and are lost in the noise. This signal has to be properly denoised before analyzing for effective condition monitoring. This paper proposes a novel method to denoise and analyze such a noisy signal. The Undecimated Discrete Wavelet Transform (UDWT) with Morlet wavelet based De-noising method is used to denoise the signal. Then this denoised signal is decomposed by Empirical Mode Decomposition (EMD) into a number of Intrinsic Mode Functions (IMF). The impulses in the signal, corresponding to the characteristic fault frequency, are seen clearly in the FFT of the IMFs. A Fast Fourier Transform (FFT), Wavelet Transform (WT), Empirical Mode Decomposition and Envelope Detection are also performed with the acquired signal and all the results are compared with the proposed method. These results clearly show the effectiveness of proposed method in detecting the faults.
Authors and Affiliations
A. Santhana Raj, N. Murali
Keywords
Related Articles
- EP ID EP104096
- DOI 10.7251/ELS1317001R
- Views 111
- Downloads 0
Influence of Signal Stationarity on Digital Stochastic Measurement Implementation
The paper presents the influence of signal stationarity on digital stochastic measurement method implementation. The implementation method is based on stochastic voltage generators, analog adders, low resolution A/D conv...
High Dimensional Electromagnetic Interference Signal Clustering Based On SOM Neural Network
In this paper, we study the spectral characteristics and global representations of strongly nonlinear, non-stationary electromagnetic interferences (EMI), which is of great significance in analysing the mathematical mode...
Exploring the use of Cadence IC in Education
Microelectronics technologies and structures is electronics subfield, related to the study of integrated circuit design and fabrication. To familiarize with this widely applicable area, engineering students should gain p...
MEMS mirrors using sub-wavelength High-Contrast-Gratings with asymmetric unit cells
High-contrast gratings (HCG) are ultra-thin elements operating in sub-wavelength regime with the period of the grating smaller than the wavelength and with the high-index grating material fully surrounded by low-index ma...
Design and Implementation of a Novel Directional Coupler for UHF RFID Reader
The directional coupler is applied to isolating RX from TX because of low cost and simplicity compared to the circulator in the radio-frequency identification (RFID) reader. Because of unequal phase velocity between odd...