Noise reduction design and research of an improved pyramidal sandwich plate coupled membrane-type acoustic metamaterial structure

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 289-297.

YANG Wenchao1, YANG Tingfang1, SU Sheng1, XIE Zelong1, HE Bin1, YI Wei2

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Abstract

In order to solve the problems of narrow sound insulation band in low frequency range, poor durability and weak risk resistance of membrane-type acoustic metamaterial (MAM), and to explore the application of MAM in the transformer noise reduction field, a noise reduction structure coupled with pyramid sandwich panel and MAM is designed. By the finite element method, the sound insulation performance of the coupled structure and its acoustic and vibration characteristics are studied, the sound solid coupling model of the structure is established, the sound transmission loss and vibration mode of the structure are analyzed, and the factors affecting the noise reduction of the structure are explored. The results show that the coupling structure has excellent broadband sound insulation characteristics in low and medium frequency, and the sound insulation characteristics of the structure can be changed by adjusting the parameters of the membrane and the plate. The sound insulation of the optimized structure at the main noise frequency of the 110kV transformer can exceed that of 110dB.

Key words

membrane-type acoustic metamaterial / sandwich plate / finite element method / sound insulation characteristics / transformer

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YANG Wenchao1, YANG Tingfang1, SU Sheng1, XIE Zelong1, HE Bin1, YI Wei2 . Noise reduction design and research of an improved pyramidal sandwich plate coupled membrane-type acoustic metamaterial structure[J]. Journal of Vibration and Shock, 2024, 43(20): 289-297

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