Extraction of Frequency-Variable Characteristics and Analysis of Modulation Mechanism under Periodic Excitation
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.
Hun Guo, Taiyong Wang, Zeyu Weng, Weidong Jin, Shaoze Yan, Xuda Qin, Guofeng Wang, Qingjian Liu and Zijing Wang
X. Q. Wang et al., "Extraction of Frequency-Variable Characteristics and Analysis of Modulation Mechanism under Periodic Excitation", Applied Mechanics and Materials, Vol. 141, pp. 279-283, 2012