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

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

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

scholarly journals Investigation on the Band Gap and Negative Properties of Concentric Ring Acoustic Metamaterial

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Meng Chen ◽  
Dan Meng ◽  
Heng Jiang ◽  
Yuren Wang
Keyword(s):  
Band Gap ◽  
Effective Mass ◽  
Coupling Effect ◽  
Mass Density ◽  
Band Gaps ◽  
Acoustic Metamaterials ◽  
Concentric Ring ◽  
Resonance Modes ◽  
Negative Effective Mass ◽  
Single Oscillator

The acoustic characteristics of 2D single-oscillator, dual-oscillator, and triple-oscillator acoustic metamaterials were investigated based on concentric ring structures using the finite element method. For the single-oscillator, dual-oscillator, and triple-oscillator models investigated here, the dipolar resonances of the scatterer always induce negative effective mass density, preventing waves from propagating in the structure, thus forming the band gap. As the number of oscillators increases, relative movements between the oscillators generate coupling effect; this increases the number of dipolar resonance modes, causes negative effective mass density in more frequency ranges, and increases the number of band gaps. It can be seen that the number of oscillators in the cell is closely related to the number of band gaps due to the coupling effect, when the filling rate is of a certain value.

Elastic superlattices with simultaneously negative effective mass density and shear modulus

2013 ◽  
Vol 113 (9) ◽  
pp. 093508 ◽  
Author(s):  
I. S. Solís-Mora ◽  
M. A. Palomino-Ovando ◽  
F. Pérez-Rodríguez
Keyword(s):  
Shear Modulus ◽  
Effective Mass ◽  
Mass Density ◽  
Negative Effective Mass

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.

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