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Research on Holospectrum Based on Phase Difference Correction

Author: ChenJianBo
Tutor: TangBaoPing
School: Chongqing University
Course: Mechanical and Electronic Engineering
Keywords: Phase difference Spectrum correction Holospectrum Rotating Machinery Fault Feature Extraction
CLC: O438.1
Type: Master's thesis
Year: 2009
Downloads: 154
Quote: 1
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Abstract


The Holospectrum in machinery and equipment, especially in the field of large rotating machinery fault diagnosis, a new technology developed. FFT-based vibration signal analysis can basically meet the common fault feature extraction and fault analysis, but due to its inability to effectively take advantage of the phase information of the vibration signal, and therefore can not fully meet the needs of precision diagnostics and complex fault diagnosis technology is holospectrum developed in this case. As Holospectrum take full advantage of the cross-section of one or more horizontal and vertical channel vibration signal amplitude, frequency and phase information, more than the general method can accurately identify and diagnosis of large rotating machinery fault characteristics implied. Subject to rotating machinery vibration signals holographic spectral analysis technique for the study, research and improve the accuracy of the holographic spectral analysis of. Comprehensive analysis and discrete spectrum correction techniques, and compare the advantages and disadvantages of the various methods of spectrum correction. Details of the discrete spectrum ratio correction method, the energy center of gravity correction method, FFT FT refine the method and several phase difference correction method principles, methods and implementation process. The results show that the retardation correction signal based on the continuous two sections of equal length wears ratio correction method in the noisy environment having a better correction accuracy, especially the phase-corrected accuracy. On this basis, combined with the various spectral characteristics of the correction method, based on the the holographic spectral analysis method of the continuous two sections of equal length, the phase difference signal correction method, hereinafter referred to based on the phase difference correction method holospectrum. Study and achieve the holospectrum correction method based on the phase difference. Based on the phase difference correction method holospectrum essentially reflect two mutually perpendicular channels of the same cross-section of the rotor of the rotating machinery vibration signal. It is on the basis of the Fourier algorithm through the retardation spectrum correction technique, accurate amplitude, frequency and phase values ??of the vibration signal obtained by free mode (Non angle interval of the entire cycle) collected, and then the rotor is the same cross-sectional level and vertical vibration amplitude of the signal, frequency and phase information to be integrated with the synthesis of a series of oval to describe the vibration behavior of the rotor in the different frequency components. Discussed in detail based on the principle of the phase difference correction method holospectrum steps of the algorithm and implementation process. Simulation and field tests show that this study based on the holographic spectral analysis of the phase difference correction method is correct and effective. On the basis of the above study, the use of object-oriented programming language VC developed a the rotating machinery holographic analysis system, mainly including data collection, time domain analysis, spectral analysis, spectrum correction, two-dimensional holographic spectrum, three-dimensional holographic spectrum holographic Falls Figure holographic axis trajectory analysis module. Field test studies have shown that the correct function of the the rotating machinery holographic analysis system developed with good engineering practical value.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Information Optics > Holographic optical
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