scholarly journals Folded planar resonator-based sonic crystal scatterer: Part II. Tuning the local resonance

2021 ◽  
Vol 1896 (1) ◽  
pp. 012028
Author(s):  
Iwan Yahya ◽  
Suparmi ◽  
Cari ◽  
Ubaidillah
Keyword(s):  
Local Resonance ◽  
Sonic Crystal

A sub-wavelength scale acoustoelastic sonic crystal for harvesting energies at very low frequencies (<∼1 kHz) using controlled geometric configurations

2016 ◽  
Vol 28 (3) ◽  
pp. 381-391 ◽  
Author(s):  
Riaz Ahmed ◽  
Dylan Madisetti ◽  
Sourav Banerjee
Keyword(s):  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Local Resonance ◽  
Geometric Configurations ◽  
Zirconate Titanate ◽  
Electromechanical Transduction ◽  
Crystal Model ◽  
Sonic Crystal ◽  
Wavelength Scale ◽  
Sub Wavelength

Predictive design to control the geometric configurations of a novel sub-wavelength scale energy scavenger to harvest energy at lower sonic frequencies (<∼1 kHz) is presented. In this work, defying the conventional physics of structural resonance at lower frequencies, the traditional solution of large size harvesters is argued by adopting the physics of local resonance in designing the energy harvesters with sub-wavelength scale foot print. It is reported that during the local resonance, the wave energy passing through the acoustoelastic sonic crystals remains trapped within the soft matrix as the dynamic strain energy; hence, it is proposed to harvest that same trapped energy by strategically embedding the smart materials inside the matrix, capable of electromechanical transduction (e.g. lead zirconate titanate). The proposed acoustoelastic sonic crystal model was able to harvest energies at four different frequencies within <∼1 kHz with possible loading conditions and respective lead zirconate titanate placements. Through experimental validation, a particular acoustoelastic sonic crystal model with sub-wavelength geometry (∼3.65 cm) was investigated. Against 10 kΩ resistive load, a maximum power density of ∼92.4 µW/cm2 was achieved. It is further reported that the geometrical model of the proposed harvesters can be predictively altered while filtering the acoustic waves and harvest the energy, simultaneously.

Broadband resonant cavity inside a two-dimensional sonic crystal

2016 ◽  
Vol 104 ◽  
pp. 1-5 ◽  
Author(s):  
Alejo Alberti ◽  
Pablo M. Gomez ◽  
Ignacio Spiousas ◽  
Manuel C. Eguia
Keyword(s):  
Resonant Cavity ◽  
Two Dimensional ◽  
Sonic Crystal

Insertion loss of periodic cylindrical shells with helical slit

2021 ◽  
Vol 69 (3) ◽  
pp. 199-208
Author(s):  
Karisma Mohapatra ◽  
Dibya Prakash Jena
Keyword(s):  
Band Structure ◽  
Insertion Loss ◽  
Cylindrical Shells ◽  
Slit Width ◽  
Sharp Peak ◽  
Acoustic Attenuation ◽  
High Frequencies ◽  
Local Resonance ◽  
Resonance Band

We propose periodic shells with helical slit to overcome the lacuna in periodic C scatterers, where the first Bragg band is considerably reduced on increasing width of the slit. The key discovery of this research indicates that, by changing the upright slit of the C scatterers to helical slits, larger insertion loss (IL) is achieved around the first Bragg band without compromising the local resonance band. Comparing the performance of periodic shells without slit or cylindrical scatterers, it is found that IL becomes larger at first Bragg band. The pitch, thickness of the shell and width of helical slit can be altered to adjust the resonance of the proposed shells. On decreasing the pitch or increasing the slit width, the resonance band shifts toward high frequencies without much alteration in acoustic attenuation of bandwidth. Additionally, below threshold pitch, the said peak merges with first Bragg band and broadens with prominent IL. The calculated band structure authenticates the bandwidth of the first Bragg band, and the additional sharp peak in IL can be attributed to local resonance of the periodic scatterers.

Noise attenuation by sonic crystal barriers made of microperforated units

2013 ◽  
Author(s):  
Victor M. Garcia-Chocano ◽  
Suitberto Cabrera ◽  
Jose Sanchez-Dehesa
Keyword(s):  
Noise Attenuation ◽  
Sonic Crystal
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