Acoustic impedance regulation of Helmholtz resonators for perfect sound absorption via roughened embedded necks - Details

Author：

Duan, Mingyu (Duan, Mingyu.) | Yu, Chenlei (Yu, Chenlei.) | Xu, Zhimin (Xu, Zhimin.) | Xin, Fengxian (Xin, Fengxian.) | Jian Lu, Tian (Jian Lu, Tian.)

Indexed by：

EI SCIE Engineering Village

Abstract：

Acoustic　impedance　regulation　of　a　neck　embedded　Helmholtz　resonator　is　realized　by　introducing　surface　roughness　to　the　neck　so　as　to　convert　the　initially　non-perfect　sound　absorber　to　a　perfect　sound　absorber.　The　proposed　roughened-neck　embedded　Helmholtz　resonator　(R-NEHR)　achieves　perfect　sound　absorption　(α＞　0:999)　at　158　Hz　across　a　deep　subwavelength　thickness　of　λ/42.　Theoretical　predictions　of　the　R-NEHR＇s　performance　are　validated　against　experimental　measurements.　Physically,　surface　roughness　triggers　the　periodic　concentration　effect　of　fluid　vibration　in　the　neck,　thereby　improving　its　acoustic　mass　and　acoustic　resistance　and　altering　the　resonant　damping　state　of　the　absorber.　As　a　result,　the　absorption　peak　position　of　the　R-NEHR　shifts　by　16.0%　to　lower　frequency,　together　with　a　peak　value　increase　of　19.6%.　This　work　provides　an　approach　for　perfect　sound　absorber　design　and　impedance　regulation　of　acoustic　metamaterials.　©　2020　BMJ　Publishing　Group.　All　rights　reserved.

Keyword：

Acoustic impedance Acoustic resonators Acoustic variables control Acoustic wave absorption Sound insulating materials Surface roughness

Author Community：

[ 1 ] [Duan, Mingyu]State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 2 ] [Duan, Mingyu]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 3 ] [Yu, Chenlei]State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 4 ] [Yu, Chenlei]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 5 ] [Xu, Zhimin]State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 6 ] [Xu, Zhimin]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 7 ] [Xin, Fengxian]State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 8 ] [Xin, Fengxian]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 9 ] [Jian Lu, Tian]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China
[ 10 ] [Jian Lu, Tian]State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China
[ 11 ] [Jian Lu, Tian]Nanjing Center for Multifunctional Lightweight Materials and Structures (MLMS), Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China

Reprint Author's Address：

[Xin, Fengxian]State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an; 710049, China;;[Xin, Fengxian]Moe Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an; 710049, China;;

Email：

fengxian.xin@gmail.com

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Source ：

Applied Physics Letters

ISSN： 0003-6951

Year： 2020

Issue： 15

Volume： 117

3 . 7 9 1

JCR@2020

3 . 7 9 1

JCR@2020

ESI Discipline： PHYSICS;

ESI HC Threshold：54

CAS Journal Grade：3

Cited Count：

WoS CC Cited Count： 21

SCOPUS Cited Count： 74

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 4

Affiliated Colleges：

国家重点实验室机械结构强度与振动国家重点实验室

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