A New Method based on HHT to analyze the dynamic characteristics of hydraulic cylinder

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (7) : 82-86.

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A New Method based on HHT to analyze the dynamic characteristics of hydraulic cylinder

Wang Xin-qing; Liang Sheng; Xia Tian; He Hong-yang; Chen Liu-hai

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Abstract

A new method based on HHT to analyze the dynamic characteristics of hydraulic cylinder was proposed. The oil pressure fluctuation signal under the periodic excitation was decomposed into IMFs by using EMD. Then classified IMFs by the Hilbert marginal spectrum of each IMF and the frequency of the free vibration and forced vibration. Reconstructing the signal after the classification, the free vibration component which reflected the dynamic characteristics of the hydraulic cylinder was extracted. The result showed that the proposed method had good performance to analyze the dynamic characteristics of hydraulic cylinder, and the free vibration component was useful for analyzing the dynamic characteristics of the hydraulic cylinder.

Key words

hydraulic cylinder / dynamic characteristics / empirical mode decomposition（EMD） / Hilbert-Huang transform（HHT）

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Wang Xin-qing;Liang Sheng; Xia Tian; He Hong-yang; Chen Liu-hai. A New Method based on HHT to analyze the dynamic characteristics of hydraulic cylinder[J]. Journal of Vibration and Shock, 2011, 30(7): 82-86