scholarly journals Bandgap mechanism and vibration reduction property of wave-resistance sleeper with negative effective mass density

AIP Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 095008
Author(s):  
Rixin Cui ◽  
Jinsong Zhou ◽  
Dao Gong ◽  
Shiqiao Tian
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Vibration Reduction ◽  
Wave Resistance ◽  
Negative Effective Mass ◽  
Reduction Property

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

Negative Effective Mass Density of One-Dimensional Hierarchical Metacomposite

2015 ◽  
Vol 82 (3) ◽  
Author(s):  
Xiyue An ◽  
Fangfang Sun ◽  
Peishi Yu ◽  
Hualin Fan ◽  
Shiping He ◽  
...  
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Rigid Bodies ◽  
Band Gaps ◽  
Mass Ratio ◽  
One Dimensional ◽  
Negative Effective Mass ◽  
Specific Frequency ◽  
The Relationship ◽  
Internal Resonators

A theoretical model of one-dimensional (1D) hierarchical metacomposite with internal resonators was proposed to generate negative effective mass over specific frequency ranges. Different from the single-resonator microstructure, the current hierarchical metamaterial with multilevel resonators was constructed by a series of springs and rigid bodies. The general formula of the current hierarchical metamaterial model was induced to reveal the relationship between the effective mass and the forcing frequency. It is found that the hierarchical metamaterial with multilevel resonators generates multifrequency band gaps with negative effective masses. The number of the band gaps equals to the order of the hierarchy. The total bandwidth for the negative effective mass increases with the hierarchy, meanwhile increasing the mass ratio can also obviously increase the bandwidth generating negative effective mass.

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

scholarly journals Negative Effective Mass in Plasmonic Systems

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1890 ◽  
Author(s):  
Edward Bormashenko ◽  
Irina Legchenkova
Keyword(s):  
Effective Mass ◽  
Mass Density ◽  
Electron Gas ◽  
Metallic Particle ◽  
Plasma Oscillations ◽  
Mechanical Coupling ◽  
Negative Effective Mass ◽  
External Frequency ◽  
Elastic Spring ◽  
Ionic Lattice

We report the negative effective mass (density) metamaterials based on the electro-mechanical coupling exploiting plasma oscillations of a free electron gas. The negative mass appears as a result of the vibration of a metallic particle with a frequency of ω, which is close the frequency of the plasma oscillations of the electron gas m 2 relative to the ionic lattice m 1 . The plasma oscillations are represented with the elastic spring k 2 = ω p 2 m 2 , where ω p is the plasma frequency. Thus, the metallic particle vibrated with the external frequency ω is described by the effective mass m e f f = m 1 + m 2 ω p 2 ω p 2 − ω 2 , which is negative when the frequency ω approaches ω p from above. The idea is exemplified with two conducting metals, namely Au and Li.

Sign in / Sign up

Export Citation Format

Share Document