Optimization design of acoustic labyrinth structure based on acoustic black hole

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 332-342.

ACOUSTIC RESEARCH AND APPLICATION

Optimization design of acoustic labyrinth structure based on acoustic black hole

CHENG Yibo, WANG Xiaoming, MEI Yulin*

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Abstract

Combined with theoretical calculation, finite element simulation and experimental measurement, the optimization design method of acoustic maze structure based on acoustic black hole is studied, and a small-size and broadband sound absorption structure with 5.01 and 7.75octaves is given.First, based on the transfer matrix method, the mathematical model of acoustic black hole is established, the reflection coefficient of acoustic black hole is calculated, and the theoretical calculation results are compared with the finite element simulation results.Then, based on the admittance variation law of the acoustic black hole, the single and double side branch acoustic maze structures are designed. By optimizing the design, the matching of the maze structure and the admittance of the acoustic black hole is realized.Finally, based on the matching results of the admittance of the acoustic maze structure, the simulated annealing algorithm is used to construct the optimization model, and the small-sized acoustic maze structure with broadband sound absorption is obtained, and the 3D sample is printed for experimental verification.The results show that the double side branch pipe acoustic maze is used to replace the ring cavity in the acoustic black hole pipeline. After optimization, the admittance of the side branch pipe maze and the acoustic black hole can achieve perfect matching, and the small size design of the structure can be realized under the premise of maintaining the sound absorption performance. The effective sound absorption bandwidth of the optimized structure is 13.36 times that before optimization, and the octavesare3.94 times those before optimization.

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Acoustic black hole;acoustic labyrinth structure;transfer matrix;finite element / experimental measurement;reflection coefficient

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CHENG Yibo, WANG Xiaoming, MEI Yulin. Optimization design of acoustic labyrinth structure based on acoustic black hole[J]. Journal of Vibration and Shock, 2025, 44(1): 332-342

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