Extraction of Frequency-Variable Characteristics and Analysis of Modulation Mechanism under Periodic Excitation

Abstract:

Free vibration of sealed hydraulic cylinder under periodic excitation has remarkable unstationary characteristics, e.g. quick change, wide frequency range and complex modulation. Combining with wavelet transform, Wigner-Ville distribution and Hilbert-Hang transform, the pressure signal of the hydraulic cylinder is decomposed, the free vibration component is extracted and re-composed, the frequency modulation characteristic is extracted and identified, and the modulation mechanism is discussed. It is demonstrated by comparison that HHT theory is effective for feature extraction and modulation analysis.

• Periodical: Applied Mechanics and Materials (Volume 141)
• Pages: 279-283
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.141.279
• Online since: November 2011
• Authors: Xin Qing Wang, Yang Zhao, Sheng Liang, Shu Hua Qian
• Keywords: Hilbert-Huang Transform (HHT), Hydraulic Cylinder, Variable Frequency Modulation Speed, Wavelet Transform (WT), Wigner-Ville Distribution (WVD)

References

[1] Z K Peng, P W Tse, F L Chu: J. Mechanical Systems and Signal Processing Vol. 19 (2005), pp.974-988.

[2] Xinqing Wang: J. Chinese journal of mechanical engineering (English edition) Vol. 3 (2001).

[3] N.E. Huang: J. Proc. of SPIE. Vol. 4391 (2001), pp.71-79.

[4] Jianming Zhang, Weigang Zhang: J. Chinese Journal of High Pressure Physics Vol. 19 (2005), pp.42-43.

[5] Linhong Wang, Bo Wu, Runsheng Du, at al: J. Chinese Journal of Mechanical Engineering Vol. 12 (2007), pp.12-14.