Modal test and numerical analysis of a bending-torsion coupling laminate plate

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (8) : 194-200.

ZHANG Ying1,2,AN Liqiang1,ZHOU Xingyin1,WANG Zhangqi1

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Abstract

The bending-torsion coupling of laminate plates was analyzed from the modal analysis point view，symmetric off-axis orientations in different location were proposed to perform the coupling feature. The frequency and mode shapes were studied experimentally and numerically. The multi-point excitation and single point measurement method was used to acquire the vibration data of the laminates, and analyze the natural frequency and vibration mode parameters. The nodal lines of laminated cantilever plates in different coupling regions were studied, and compared with finite element simulation results. A new method was proposed to quantitatively describe the bending-torsional coupling performance of laminates using modal confidence factor moal assurance criterion(MAC). The results show that the coupling effect of the centrally coupled laminates is significant at low-order vibrations, while the coupling effect of the end-coupled laminates is significant at higher-order modes.

Key words

laminate plate / modal characteristic / bending torsion coupling / modal identification matrix

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ZHANG Ying1,2,AN Liqiang1,ZHOU Xingyin1,WANG Zhangqi1. Modal test and numerical analysis of a bending-torsion coupling laminate plate[J]. Journal of Vibration and Shock, 2021, 40(8): 194-200

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