Design and measurements of a broadband two-dimensional acoustic metamaterial with anisotropic effective mass density

2011 ◽  
Vol 109 (5) ◽  
pp. 054906 ◽  
Author(s):  
Lucian Zigoneanu ◽  
Bogdan-Ioan Popa ◽  
Anthony F. Starr ◽  
Steven A. Cummer
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Two Dimensional ◽  
Acoustic Metamaterial

Transmission Loss of Membrane-Type Acoustic Metamaterial with Negative Effective Mass

2017 ◽  
Vol 898 ◽  
pp. 1749-1756 ◽  
Author(s):  
Guo Chang Lin ◽  
Song Qiao Chen ◽  
Yu Liang Li ◽  
Hui Feng Tan
Keyword(s):  
Effective Mass ◽  
Transmission Loss ◽  
Mass Density ◽  
Small Mass ◽  
Equivalent Model ◽  
Sound Insulation ◽  
Rubber Membrane ◽  
Acoustic Metamaterial ◽  
Spring Force ◽  
Membrane Type

The transmission loss (TL) of membrane-type acoustic metamaterials consisting of small mass and rubber membrane was studied. By establishing a mass-spring equivalent model of metamaterial structural unit, which regards rubber membrane as having the dual role of damping force and spring force, we demonstrated that effective mass density of this membrane-type acoustic metamaterial was negative in the band gap range by theoretical analysis. Based on the theory of plane wave propagation, we studied the sound insulation of this membrane-type acoustic metamaterial. The result showed that membrane-type metamaterial was based on the principle of dipole resonance, which made the membrane-type acoustic metamaterial appear high reflection and low transmission phenomenon so as to achieve the aim of reducing noise. By optimal design, the sound attenuation frequency range of this membrane-type acoustic metamaterial was reduced to 20Hz-100Hz, greatly enhancing the ability of this metamaterial in terms of low-frequency sound insulation. We obtained the distribution of sound intensity at the optimum transmission frequency and the best reflection frequency by coupled acoustic-structural analysis. The best sound insulation frequency was matched with the second order and the third order eigenfrequency of this membrane-type acoustic metamaterial unit, and the strain energy was concentrated at the joint of small mass and the membrane. The total sound insulation of acoustic metamaterial plate was better than the single metamaterial unit.

An Acoustic Metamaterial Bending Waveguide Design Using Transformation Acoustics

2011 ◽  
Author(s):  
Liang-Yu Wu ◽  
Tzeh-Yi Chiang ◽  
Mei-Ling Wu ◽  
Lien-Wen Chen
Keyword(s):  
Layered Structure ◽  
Material Properties ◽  
Mass Density ◽  
Homogeneous Material ◽  
Two Dimensional ◽  
Negative Mass ◽  
Acoustic Metamaterial ◽  
Transformation Medium ◽  
Waveguide Design ◽  
Transformation Acoustics

An acoustic bending waveguide is designed by transformation acoustics. A two-dimensional square area with anisotropic and homogeneous material properties is transformed into a fan-shaped area with anisotropic and inhomogeneous material properties to rotate the direction of beam propagation. The transformation medium can be realized by alternating layered structure consisting of water and fluid with negative mass density. We propose that an acoustic metamaterial composed of three layers in water background can be designed to replace negative mass density fluid and achieve the acoustic bending waveguide.

Negative effective mass density of acoustic metamaterial plate decorated with low frequency resonant pillars

2014 ◽  
Vol 116 (18) ◽  
pp. 184504 ◽  
Author(s):  
Mourad Oudich ◽  
Bahram Djafari-Rouhani ◽  
Yan Pennec ◽  
M. Badreddine Assouar ◽  
Bernard Bonello
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Low Frequency ◽  
Acoustic Metamaterial ◽  
Negative Effective Mass

Meta-atom cluster acoustic metamaterial with broadband negative effective mass density

2014 ◽  
Vol 115 (5) ◽  
pp. 054905 ◽  
Author(s):  
Huaijun Chen ◽  
Shilong Zhai ◽  
Changlin Ding ◽  
Song Liu ◽  
Chunrong Luo ◽  
...  
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Acoustic Metamaterial ◽  
Atom Cluster ◽  
Negative Effective Mass ◽  
Meta Atom

Effective mass enhancement of two-dimensional electrons in a one-dimensional superlattice potential

2000 ◽  
Vol 76 (24) ◽  
pp. 3600-3602 ◽  
Author(s):  
Amlan Majumdar ◽  
L. P. Rokhinson ◽  
D. C. Tsui ◽  
L. N. Pfeiffer ◽  
K. W. West
Keyword(s):  
Effective Mass ◽  
Two Dimensional ◽  
One Dimensional ◽  
Mass Enhancement
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