Measurement and finite element analysis of the dynamic characteristics of trees

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (2) : 271-280.

LI Zhengnong1， ZHAO Di1， ZHONG Min2， WU Honghua1， CHEN Bin1， XU Haijie1

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Abstract

The modal identification and analysis of a willow tree under force excitation and natural wind excitation were carried out, and it was found that part of the modal identification results under force excitation were missing while the main modes of willow tree could be better identified under natural wind excitation. With synthesizing the modal identification results of the two excitation, the first ten modes of willow tree were determined. Based on the actual willow shape and reasonable material parameters, a finite element analysis model was constructed for the willow tree, and modal analysis was carried out to obtain the first ten natural vibration frequencies and vibration modes of the willow tree. It was found that the vibration of the willow tree was mainly the one of the branch, while the one of the trunk was relatively small. Finally, the comparison between the finite element analysis results and the results of actual measurement showed that there was a good correspondence between them, which indicated that the construction of willow finite element model was correct, and the canopy structure of willow had a great influence on the dynamic characteristics of willow structure.

Key words

trees / force hammer excitation / natural wind excitation / finite element / the dynamic characteristics

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LI Zhengnong1， ZHAO Di1， ZHONG Min2， WU Honghua1， CHEN Bin1， XU Haijie1. Measurement and finite element analysis of the dynamic characteristics of trees[J]. Journal of Vibration and Shock, 2022, 41(2): 271-280

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