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Investigation on low-frequency broadband characteristics of three-dimensional acoustic black hole superstructures

School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

State Key Laboratory for Strength and Vibration of Mechanical Structure, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

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Xiao Liang

School of Mechanical Engineering, Xiangtan University, Xiangtan, Hunan 411105, P. R. China

E-mail Address: liangxiao@xtu.edu.cn

Corresponding author.

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Jiu Hui Wu

http://orcid.org/0000-0003-2387-618X

School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

State Key Laboratory for Strength and Vibration of Mechanical Structure, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

E-mail Address: ejhwu@mail.xjtu.edu.cn

Corresponding author.

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Peng Shang

School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

Engineering University of PAP, Xi’an, Shanxi 710086, P. R. China

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, and

Jiamin Niu

School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

State Key Laboratory for Strength and Vibration of Mechanical Structure, Xi’an Jiaotong University, Xi’an, Shanxi 710049, P. R. China

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https://doi.org/10.1142/S0217979220501519Cited by:1 (Source: Crossref)

Abstract

In order to solve the problem of strong penetration and difficult attenuation of low-frequency sound wave in traditional materials, several three-dimensional acoustic black hole superstructures are designed. First of all, multi-stage acoustic black holes are designed. It is found that their sound insulation coefficient is about 0.9 in the frequency range of 50–1600 Hz when the ration of the outlet tip diameter to the inlet diameter is $d / D = 12 / 99 = 0.121$ . Then, the acoustic black hole thin and light superstructure was designed by embedding many acoustic black hole units in an array on the 10 mm thick plate. The sound insulation coefficient of two samples embedded 81 or 144 acoustic black holes is above 0.96 in the frequency range of 50–1600 Hz. To facilitate processing and engineering applications, we designed acoustic black hole wedge-shaped plate superstructures, and found that the average sound insulation of these acoustic black hole superstructures is 30 dB in the frequency range of 50–1600 Hz. These superstructures will be widely used in anechoic rooms, factories and aviation.

Keywords:

PACS: 43.58.+z, 43.90.+v

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