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EMU bogie bearing reliability analysis and fault diagnosis technology research

Author: NieZuo
Tutor: ZhouChunHua
School: Central South University
Course: Transport equipment and Information Engineering
Keywords: EMU bogie bearings Reliability Analysis EMD BP neural network Improved Genetic Algorithm
CLC: U269
Type: Master's thesis
Year: 2011
Downloads: 202
Quote: 0
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Abstract


EMU efficient means of transport to small groups , large density intercity and suburban railway . Bogie is a high-speed the EMU running gear , decided to train operators speed and running quality . EMU bogie bearings working conditions affecting the safety of railway transport one of the important factors to carry out EMU bogie bearing reliability analysis and fault diagnosis , to ensure the safety of the operators , improve maintenance efficiency and avoiding unnecessary losses have important significance . In this paper, the fault tree analysis method to establish the EMU bogie bearing failure model , and improve its reliability requirements , and a brief introduction EMU Bogie bearing vibration mechanism , fault characteristic frequency . Bearing fault monitoring technologies , vibration monitoring techniques to monitor EMU bogie bearings , and in-depth study of more advanced theories and methods in the field of fault diagnosis . In this paper, two methods of bearing failure diagnosis and monitoring . A time-frequency domain parameters of diagnostic methods , another method is : intelligent diagnostic method , the first vibration signal wavelet packet denoising improve its signal-to-noise ratio , and then based on EMD ( Empirical Mode Decomposition ) method to extract energy characteristics of bearing failure , the fault signal is decomposed to the IMF, the analysis of several important IMF , each IMF component , as BP neural network input vector ; based on genetic algorithm optimization characteristics , combined with improved genetic algorithm BP optimize parameters of the neural network , and then use its bearing failure diagnosis, analysis of the effect of this method diagnosis . The system is based on software as the core of the virtual instrument development , so that the system has scalability , flexible definition , high performance and low maintenance cost advantages . System software development process platform using LabWindows / CVI. Experiment confirmed EMU bogie bearing fault diagnosis system can accurately predict its failure to provide reasonable maintenance recommendations .

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CLC: > Transportation > Rail transport > Locomotive works > Depot, locomotive maintenance and repair
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