Effective mass density based topology optimization of locally resonant acoustic metamaterials for bandgap maximization

2016 ◽  
Vol 383 ◽  
pp. 89-107 ◽  
Author(s):  
Xiong Wei Yang ◽  
Joong Seok Lee ◽  
Yoon Young Kim
Keyword(s):  
Topology Optimization ◽  
Effective Mass ◽  
Mass Density ◽  
Acoustic Metamaterials

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.

Active acoustic metamaterials with tunable effective mass density by gradient magnetic fields

2014 ◽  
Vol 105 (7) ◽  
pp. 071913 ◽  
Author(s):  
Xing Chen ◽  
Xianchen Xu ◽  
Shigang Ai ◽  
HaoSen Chen ◽  
Yongmao Pei ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Effective Mass ◽  
Mass Density ◽  
Acoustic Metamaterials ◽  
Active Acoustic Metamaterials

scholarly journals Magnetoactive acoustic metamaterials based on nanoparticle-enhanced diaphragm

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xingwei Tang ◽  
Shanjun Liang ◽  
Yusheng Jiang ◽  
Cong Gao ◽  
Yujin Huang ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Effective Mass ◽  
Magnetic Force ◽  
Mass Density ◽  
Second Derivative ◽  
Acoustic Metamaterials ◽  
Vibration Properties ◽  
Potential Applications ◽  
Membrane Type ◽  
The Magnetic Field

AbstractMagnetoactive membrane-type acoustic metamaterials are fabricated by coating a layer of magnetic nanoparticles on the polyethylene (PE) membranes and their vibration characters are investigated experimentally. From our experiments, we discovered that, under different magnetic fields by varying the distance between a magnet and the membranes, such membranes exhibit tunable vibration eigenfrequencies (the shift towards lower frequencies), which is caused by the variation of the effective mass density and effective tension coefficient resulted from the second derivative of the magnetic field. The strong magnetic force between the layer of magnetic nanoparticles and the magnet enhances the eigenfrequency shift. A spring oscillator model is proposed and it agrees well with the experimental results. We also experimentally observed that the vibration radius, effective mass density, and effective tension coefficient of the membranes can enormously affect the eigenfrequencies of the membranes. We believe that this type of metamaterials may open up some potential applications for acoustic devices with turntable vibration properties.

scholarly journals Topology optimization of acoustic metamaterials with negative mass density using a level set-based method

2014 ◽  
Vol 1 (4) ◽  
pp. DSM0040-DSM0040
Author(s):  
Lirong LU ◽  
Masaki OTOMORI ◽  
Takayuki YAMADA ◽  
Takashi YAMAMOTO ◽  
Kazuhiro IZUI ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Level Set ◽  
Mass Density ◽  
Acoustic Metamaterials ◽  
Negative Mass
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