Band gap mechanism and low-frequency vibration reduction of C-slot phononic crystal plate

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (7) : 258-266.

ACOUSTIC RESEARCH AND APPLICATION

Band gap mechanism and low-frequency vibration reduction of C-slot phononic crystal plate

ZHENG Mingjun*, LI Tianhua, ZUO Xuechao

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Abstract

In order to control the low-frequency vibration and noise in vehicle plate structure, a new C-slot phononic crystal structure is proposed. The finite element method is used to calculate the band curve of the structure and to analyze the band gap combined with the motion mode. The displacement transmission characteristics are used to verify the vibration reduction ability of the structure. The effect of physical parameters on the band gap is illustrated by the equivalent model. The results show that the band gap of the C-slot phononic crystal mainly depends on the suppression of the matrix plate by the resonant unit in the local resonance mode. Adjusting the physical parameters of the structure is equivalent to changing the equivalent mass or equivalent stiffness of the system, which affects the range of the band gap range. Reasonable parameters can make the structure form a complete band gap in the range of 200Hz with 5mm, and form a curved band gap in the lower frequency range. In addition, the vibration attenuation in the corresponding band gap range is 69dB, which indicates that the C-slot phononic crystal plate has a good vibration reduction effect. The research provides a theoretical basis for obtaining low-frequency band gap of phononic crystals, and has a certain application prospect in the field of low-frequency vibration and noise reduction in vehicle.

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C-slot / phononic crystal / low-frequency band gap / local resonance / vibration and noise reduction in vehicle

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ZHENG Mingjun, LI Tianhua, ZUO Xuechao. Band gap mechanism and low-frequency vibration reduction of C-slot phononic crystal plate[J]. Journal of Vibration and Shock, 2025, 44(7): 258-266

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