Modal parameter identification based on empirical mode decomposition and energy operator for planetary gearboxes

LI Kang-qiang FENG Zhi-peng

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (8) : 1-8.

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (8) : 1-8.

Modal parameter identification based on empirical mode decomposition and energy operator for planetary gearboxes

  •   LI Kang-qiang  FENG Zhi-peng
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Abstract

In order to identify modal parameters for a planetary gearbox which has property of multi-degree of freedom, low frequency, and dense frequency, a new approach was introduced in conjunction with the empirical mode decomposition (EMD) and energy operator (EO). A vibration signal was decomposed into several intrinsic mode functions (IMFs) via the EMD method to determine the mode order and to satisfy the requirement of the EO. Then we estimate the modal frequencies of each IMF via the higher order energy operator. According to the correlation between IMFs and the original signal, we could distinguish the mode order by the size of frequency. In essence, the damping ratio reflects the energy attenuation. Meanwhile, the energy operator can track the system energy. Based on the aforementioned two theories, we put forward a half cycle energy operator (HCEO) method to estimate damping ratio. By comparing conventional methods, the proposed method was illustrated and verified by simulations and experiments. The results show that the proposed method is effective to extract modal parameters of a planetary gearbox.

Key words

modal frequency / structural damping ratio / energy operator / planetary gearbox

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LI Kang-qiang FENG Zhi-peng . Modal parameter identification based on empirical mode decomposition and energy operator for planetary gearboxes[J]. Journal of Vibration and Shock, 2018, 37(8): 1-8

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