title: Hybrid acoustic metamaterial as super absorber for broadband low-frequency sound.
abstract: A hybrid acoustic metamaterial is proposed as a new class of sound absorber, which exhibits superior broadband low-frequency sound absorption as well as excellent mechanical stiffness/strength. Based on the honeycomb-corrugation hybrid core (H-C hybrid core), we introduce perforations on both top facesheet and corrugation, forming perforated honeycomb-corrugation hybrid (PHCH) to gain super broadband low-frequency sound absorption. Applying the theory of micro-perforated panel (MPP), we establish a theoretical method to calculate the sound absorption coefficient of this new kind of metamaterial. Perfect sound absorption is found at just a few hundreds hertz with two-octave 0.5 absorption bandwidth. To verify this model, a finite element model is developed to calculate the absorption coefficient and analyze the viscous-thermal energy dissipation. It is found that viscous energy dissipation at perforation regions dominates the total energy consumed. This new kind of acoustic metamaterials show promising engineering applications, which can serve as multiple functional materials with extraordinary low-frequency sound absorption, excellent stiffness/strength and impact energy absorption.
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Yufan
authors.initials: Y
authors.lastname: Tang
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Shuwei
authors.initials: S
authors.lastname: Ren
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Han
authors.initials: H
authors.lastname: Meng
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Fengxian
authors.initials: F
authors.lastname: Xin
authors.affiliation: Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Lixi
authors.initials: L
authors.lastname: Huang
authors.affiliation: School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Tianning
authors.initials: T
authors.lastname: Chen
authors.affiliation: Department of Civil Engineering, University of Siegen, Siegen 57068, Germany.
authors.forename: Chuanzeng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.|MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, P.R. China.
authors.forename: Tian Jian
authors.initials: TJ
authors.lastname: Lu