Dissertation > Excellent graduate degree dissertation topics show

The Application and Research of Time-Frequency Analysis Technology in Stress Corrosion Cracking of Metal

Author: DongCuiYing
Tutor: ZhaoLiFeng
School: Ocean University of China
Course: Signal and Information Processing
Keywords: Stress corrosion Wavelet Analysis Denoising Energy density map Feature Extraction
CLC: TG171
Type: Master's thesis
Year: 2009
Downloads: 72
Quote: 1
Read: Download Dissertation

Abstract


Metal corrosion in the day-to-day production and life, has brought us a huge economic loss and social harm. The case of the stress corrosion cracking of such a \Therefore, the measurement and characterization of stress corrosion of high strength, the development of ultra-high-strength steel has a very important significance. When the devices have a tendency to stress corrosion in the corrosive medium, the electrochemical method has become very important to predict and prevent equipment research and application of stress corrosion. Electrochemical noise in the measurement process, without the working electrode may change study the electrode reaction of the electrode surface of the external disturbance is applied, therefore, electrochemical noise techniques can truly reflect the situation of the material corrosion. And the measurement method is simple, less demanding instrument. With the technical aspects of the development of computers in data acquisition, signal processing and rapid analysis, electrochemical noise technique in the field of metal corrosion, a wide range of applications. The main work of this article is: 1, non-stationary signals for electrochemical noise signals generated in the metal stress corrosion process, the analysis of the current commonly used analytical methods such as the method of Fourier transform (FT), the maximum entropy method (MEM) and other methods limitations. 2, analysis of the advantages of wavelet analysis method in the analysis of metal stress corrosion electrochemical noise signal, wavelet threshold denoising method to eliminate the stress corrosion electrochemical noise signal measurement interference. 3, the energy density map (EDP) method combined with wavelet transform applied stress corrosion electrochemical noise signal processing to reconstruct the signal, determine the main energy of the signal band, and then extract the electrochemical characteristics of signals, on this basis on the stress corrosion process for analysis. 4, through the slow strain rate tensile test, processing the electrochemical noise signals generated in the metal 40Cr steel under certain conditions, the occurrence of stress corrosion process. The electrochemical characteristics visible by the experiment, the simple use of wavelet threshold denoising often at the same time so that the signal reflects the stress corrosion mechanism ingredients distortion. The use of the wavelet transform based on the energy density of the Figure (EDP) method, while suppressing measuring interference can preferably extract the electrochemical characteristics of stress corrosion signal.

Related Dissertations

  1. Research on Electromagnetic Acoustic Transducer Detection System Based on FPGA,TH878.2
  2. Research on Automatic Detection Algorithm for Substructure Distress of Highway Pavement Based on SVM,U418.6
  3. Research on Testing and Analyzing Technology for Time Parameter of Aerospace Relay,TM58
  4. ISAR Imaging Simulation of Space Targets and Target Recognition Based on ISAR Images,TN957.52
  5. Research on Feature Extraction and Classification of Pulse Waveform for Cholecystitis and Nephrotic Syndrome Diagnosis,TP391.41
  6. Application of Q-Learning in the Content-Based Image Retrieval Technology,TP391.41
  7. Research on Methods of Medical Ultrasound Image Denoising,TP391.41
  8. Research on Transductive Support Vector Machine and Its Application in Image Retrieval,TP391.41
  9. Research on Feature Extraction and Classification of Tongue Shape and Tooth-Marked Tongue in TCM Tongue Diagnosis,TP391.41
  10. Research on Visual Measurement for Spacecraft Rendezvous and Approach,TP391.41
  11. Research on the Image Real-Time Acquisition, Storage and Image Processing System,TP391.41
  12. Feature Extraction, Selection and Combination in Lipreading,TP391.41
  13. Multi-currency Notes Technology Research and Implementation,TP391.41
  14. The Research on Paper Currency Classification Method Based on Harr-Like Feature and Minimal Ball Including Samples,TP391.41
  15. Pavement Distress Recognition Based on Image,TP391.41
  16. Research on Visual Detection and Tracking of Mobile Robots,TP242.62
  17. Research on Fusion Algorithm of Hyper Spectral and High Spatial Resolution Remote Sensing Image,TP751
  18. Study of Event Related Potentials Based on Chinese Auditory Cognition,R318.0
  19. An Approach for Identifying a Plant Resistance Gene Based on the Random Forest,Q943
  20. Design of Testing Equipment for Electronic Products,TN06
  21. Tobacco Diseases Auto-Recognition Research Based on Image Processing Technology,S435.72

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Theory of metal corrosion
© 2012 www.DissertationTopic.Net  Mobile