Insertion loss of sonic crystal made with multi resonant shells

Mohapatra, Karisma; Jena, D.P.

doi:10.1016/j.apacoust.2020.107676

Cited by 14 publications

(10 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As can be seen, over the entire frequency range of 100-5000 Hz, the trends and magnitudes of the experiment and simulation results are corresponding and particularly well compared in the frequency range of 630-1000 Hz. This firstly suggests that the simulation model is feasible for the current numerical experiments and the reported simulation results are supposed to be convinced [19,32,33,[35][36][37]. It is noted that the highest value of ∆LA eq is occurred at 1000 Hz both in experiment and simulation, followed by 800 Hz.…”

Section: Experimental Results and Comparisonmentioning

confidence: 66%

“…It was observed that within a certain limit a better noise attenuation performance can be attained when the volume of the cavity was increased. Mohapatra et al [19] studied the insertion loss of four different scatterers that were comprised of two cylindrical shells (inner and outer) but different configurations of the opening slit. It was discovered that the function of the outer shell tended to shift the resonance frequency of the scatterer to the low-frequency side while the inner shell indicated the opposite effect.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Parametric Optimization of Local Resonant Sonic Crystals Window on Noise Attenuation by Using Taguchi Method and ANOVA Analysis

et al. 2022

View full text Add to dashboard Cite

Local resonant sonic crystals (LRSCs) window as a novel design has recently been proposed to achieve a good balance between noise mitigation, natural ventilation and natural lighting. In an effort to explore the feasibilities of such designs in civil residential buildings, an optimization methodology was proposed to develop a more compact LRSCs window with high noise attenuation performance in the present study. Specifically, the Taguchi method was adopted for the design of experiments on the parameters of interest and their corresponding levels, and SN ratio analysis was then applied for the parametric evaluations on the noise attenuation on specified frequencies in traffic noise (concentrated sound energy frequency range: 630–1000 Hz). Three optimal sets of design parameters on the interested frequencies, namely, 630 Hz, 800 Hz and 1000 Hz were obtained. ANOVA analysis was conducted to quantificationally identify the design parameters with statistical significance and remarkable contribution to the desired performance. Results indicate that the slit size has the most significant influence on the overall noise attenuation performance, followed by cavity width. An optimal set of design parameters to achieve the overall best noise reduction performance in the frequency range of 630–1000 Hz was finally determined by combining the SN ratio and ANOVA analysis. A prototype of the final optimized LRSCs window was then fabricated and tested in a semi-anechoic chamber. Good agreement was found between the experiment and numerical simulation. In comparison to the benchmark case, the final optimized design can achieve a further noise reduction by 2.84 dBA, 3.48 dBA and 5.56 dBA for the frequencies of 630 Hz, 800 Hz and 1000 Hz, respectively. The overall noise reduction for the interested frequency range can be promoted by 3.28 dBA. The results indicate that the proposed optimization methodology is practical and efficient in designing a high-performance LRSCs window or improving similar applications.

show abstract

Section: Experimental Results and Comparisonmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Local Resonant Sonic Crystals Window on Noise Attenuation by Using Taguchi Method and ANOVA Analysis

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For the reference, other experimental studies also have been performed using portable anechoic chamber. [26][27][28] (b) The sound pressure has been measured with PCB© free field array microphone. The calibration of the microphone has been carried out with an L&D© class one calibrator with (model no CAL-200©).…”

Section: Experimentationmentioning

confidence: 99%

“…For the reference, other experimental studies also have been performed using portable anechoic chamber. 26–28…”

Section: Experimentationmentioning

confidence: 99%

Numerical and experimental methods to measure the acoustic performance of sonic crystal noise barrier

Mohapatra

Jena

2023

Building Acoustics

View full text Add to dashboard Cite

The array of periodic scatterers is known as sonic crystal at present and sonic crystal is the most cost-effective solution for a “noise barrier” because of its acoustic attenuation due to size, geometry, and periodic arrangement of scatterers. The simulation methods to estimate acoustic attenuation and the Bragg band of the periodic scatterers have been demonstrated in this paper. First, the periodic cylindrical and C-shaped scatterers have been studied along with the effect of thermo-viscous losses to establish the simulation method. Next, in the laboratory environment, the measurements have been carried out for periodic cylindrical and C-shaped scatterers and the experimental results are in good agreement with simulation results.

show abstract

“…The difference between sonic crystal and acoustic metamaterial is that the band gap in sonic crystal is due to the periodicity of unit cells, whereas in metamaterials, there is one additional band gap due to the local resonant behaviour of unit cells. 17,18 Mohapatra and Jena 19 designed a metamaterial by placing two Helmholtz resonators co-axially as scatterers. The designed structure exhibited the band properties of both resonators.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study of reuse of plastic bottles as metamaterial

Gulia,

Dogra,

Gupta

2023

Building Acoustics

View full text Add to dashboard Cite

The present work introduces a novel approach to designing metamaterial for low frequency and high frequency wave attenuation by repurposing plastic waste. The metamaterial is constructed using a duct-like structure with a periodic arrangement of bottles of different sizes. This configuration leads to the formation of a local resonant band, which spans from 240 to 340 Hz. In both the numerical model and the experimental setup, a harmonic excitation is given to the proposed configuration and transmission loss is computed as a function of frequency. The experimental results support the findings obtained from numerical simulations, confirming the effectiveness of the designed metamaterial. One crucial aspect discovered in this work is that introducing space between the bottle’s neck and the side wall of the structure causes the bottles to act as Helmholtz resonators. Thus, in turn, this results in an additional band gap at low frequencies, complementing the existing Bragg’s band gap achieved by the periodic arrangement of bottles. The ability to change the size of the bottles gives control over the position of the band gap, allowing for greater flexibility in tailoring the metamaterial to specific noise attenuation requirements. The applications of these plastic bottle-based metamaterials are wide ranging, especially in improving the indoor acoustic environment of buildings. This work opens up a new avenue for further exploration and innovation in the field of sustainable and environmentally friendly metamaterials.

show abstract

Insertion loss of sonic crystal made with multi resonant shells

Cited by 14 publications

References 26 publications

Parametric Optimization of Local Resonant Sonic Crystals Window on Noise Attenuation by Using Taguchi Method and ANOVA Analysis

Parametric Optimization of Local Resonant Sonic Crystals Window on Noise Attenuation by Using Taguchi Method and ANOVA Analysis

Numerical and experimental methods to measure the acoustic performance of sonic crystal noise barrier

Preliminary study of reuse of plastic bottles as metamaterial

Contact Info

Product

Resources

About