Full field reconstruction of mechanical structure vibration responses based on measurement point optimization and modal expansion

LI Zhiguo1,2, QIAO Baijie1,2, ZHU Yuda1,2, ZHOU Kai1,2, CHEN Xuefeng1,2

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 123-134.

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PDF(5717 KB)
Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 123-134.

Full field reconstruction of mechanical structure vibration responses based on measurement point optimization and modal expansion

  • LI Zhiguo1,2, QIAO Baijie1,2, ZHU Yuda1,2, ZHOU Kai1,2, CHEN Xuefeng1,2
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Abstract

A method for full-field vibration response reconstruction of mechanical structure based on measurement point optimization and modal expansion was proposed. The measurement point placement was optimized by using the Determination optimization design method, and the acceleration response expansion matrix was constructed according to the modal expansion method. thereby, the full-field acceleration responses of the structure could be reconstructed with the acceleration responses of the optimally arranged limited measurement points. Then response-field visualization of the mechanical structure was realized by importing the reconstructed acceleration responses to the finite element analysis software. Numerical simulation analysis and vibration response reconstruction experiments were carried out in the base-upright structure. The validity and robustness of the full-field vibration response reconstruction method of the mechanical structure were verified when the structure was on the multi-mode resonance or the off-resonance. Furthermore, by analyzing the acceleration modal contribution, the main vibration modes which were used to analyze the vibration responses of the mechanical structure could be accurately selected, then the full-field vibration response reconstruction based on fewer measurement points was realized.

Key words

full-field vibration response reconstruction / Determination optimization design / modal expansion / response-field visualization

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LI Zhiguo1,2, QIAO Baijie1,2, ZHU Yuda1,2, ZHOU Kai1,2, CHEN Xuefeng1,2. Full field reconstruction of mechanical structure vibration responses based on measurement point optimization and modal expansion[J]. Journal of Vibration and Shock, 2023, 42(9): 123-134

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