International Journal of Precision Engineering and Manufacturing

  • 제6권4호
  • /
  • Pages.26-30
  • /
  • 2005
  • /
  • 2234-7593(pISSN)
  • /
  • 2005-4602(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

Adaptive Wavelet Analysis of Non-Stationary Vibration Signal in Rotor Dynamics

  • Ji Guoyi (Institute of Vibration Engineering. Nanjing University of Aeronautics and Astronautics) ;
  • Park Dong-Keun (Machine Tool Research Center, Changwon National University) ;
  • Chung Won-Jee (Department of Mechanical Design and Manufacturing, Changwon National University) ;
  • Lee Choon-Man (Department of Mechanical Design and Manufacturing, Changwon National University)
  • 발행 : 2005.10.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

A rotor run-up or run-down process provide more useful information for modal analysis than normal operation conditions. A traditional difficulty associated with rotor run-up or run-down analysis is the non-stationary nature of vibration data. This paper compares Short-Time Fourier Transform (STFT) and the wavelets analysis in these non-stationary signal analyses. An Adaptive Wavelet Analysis (AWT) is proposed to analyze these signals. Although simulations and experiments in a simple rotor-bearing system show that both STFT and AWT can be used to analyze non-stationary vibration signals in rotor dynamics, proposed AWT provides better results than STFT analysis. From the amplitude-frequency curve obtained by AWT, the modal frequency and damping ratio are calculated. This paper also analyzes the characteristics of signals when the shaft touches the outer hoop in a run-up process. The AWT can give a good result in this complex dynamic analysis of the touching process.

키워드

참고문헌

  1. Goodwin, M. J., 'Dynamics of Rotor-Bearing System,' London, Unwin Hyman, 1989
  2. Luc, H., Herman, V. A., Maher, A., 'Modal Testing and Analysis of a Car under Operational Conditions,' Proceedings of the 16th International Modal Analysis Conference, pp.1000-1006, 1998
  3. James, III, George, H. C., Mayes, R. L., 'Modal Parameter Extraction from Large Operating Structures Using Ambient Excitation,' Proceedings of the 14th International Modal Analysis Conference, pp.77-83, 1996
  4. Chui, C. K., 'An Introduction to Wavelets,' Academic Press Inc., 1992
  5. Ogden, R. T., 'Essential Wavelets for Statistical Applications and Data Analysis,' Birkhauser Boston, 1997
  6. Cohen, L., 'Time-Frequency Analysis,' Prentice-Hall, 1995
  7. Staszewski, W. J., Tomlinson, G. R., 'Application of the Wavelet Transform to Fault Detection in a Pur Gear,' Mechanical Systems and Signal Processing, Vol. 8, No. 3, pp.289-307, 1994 https://doi.org/10.1006/mssp.1994.1022
  8. Ruzzene, M., Fasana, A., Garibaldi, L., Piombo, B., 'Natural Frequencies and Dampings Identification Using Wavelet Transform : Application to Real Data,' Mechanical System and Signal Processing, Vol. 11, No. 2, pp.207-218, 1997 https://doi.org/10.1006/mssp.1996.0078
  9. Rao, S. S., 'Mechanical Vibrations,' Addison-Wesley Publishing Company, 1990
  10. Peeters, B., Ventura, C. E., 'Comparative Study of Modal Analysis Techniques for Bridge Dynamic Characteristics,' Mechanical System and Signal Processing, Vol.17, No. 5, pp.965-988, 2003 https://doi.org/10.1006/mssp.2002.1568