scholarly journals Multi-frequency sound energy harvesting using Helmholtz resonators with irradiated cross-linked polypropylene ferroelectret films

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115002
Author(s):  
Chao Song ◽  
Jinfeng Zhao ◽  
Xingchen Ma ◽  
Mi Zhang ◽  
Weitao Yuan ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Sound Energy ◽  
Frequency Sound ◽  
Helmholtz Resonators

Design of efficient low-frequency sound absorbers using an array of Helmholtz Resonators

2020 ◽  
Vol 148 (4) ◽  
pp. 2798-2799
Author(s):  
Vidhya Rajendran ◽  
Tomás I. Méndez Echenagucia ◽  
Andrew A. Piacsek
Keyword(s):  
Low Frequency ◽  
Frequency Sound ◽  
Helmholtz Resonators

scholarly journals Low-Frequency, Open, Sound-Insulation Barrier by Two Oppositely Oriented Helmholtz Resonators

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1544
Author(s):  
Yi-Jun Guan ◽  
Yong Ge ◽  
Hong-Xiang Sun ◽  
Shou-Qi Yuan ◽  
Xiao-Jun Liu
Keyword(s):  
High Performance ◽  
Low Frequency ◽  
Single Layer ◽  
Sound Insulation ◽  
Architectural Acoustics ◽  
Frequency Sound ◽  
Helmholtz Resonators ◽  
Viscous Loss ◽  
Insulation Effect ◽  
Broadband Sound

In this work, a low-frequency, open, sound-insulation barrier, composed of a single layer of periodic subwavelength units (with a thickness of λ/28), is demonstrated both numerically and experimentally. Each unit was constructed using two identical, oppositely oriented Helmholtz resonators, which were composed of a central square cavity surrounded by a coiled channel. In the design of the open barrier, the distance between two adjacent units was twice the width of the unit, showing high-performance ventilation, and low-frequency sound insulation. A minimum transmittance of 0.06 could be observed around 121.5 Hz, which arose from both sound reflections and absorptions, created by the coupling of symmetric and asymmetric eigenmodes of the unit, and the absorbed sound energy propagating into the central cavity was greatly reduced by the viscous loss in the channel. Additionally, by introducing a multilayer open barrier, a broadband sound insulation was obtained, and the fractional bandwidth could reach approximately 0.19 with four layers. Finally, the application of the multilayer open barrier in designing a ventilated room was further discussed, and the results presented an omnidirectional, broadband, sound-insulation effect. The proposed open, sound-insulation barrier with the advantages of ultrathin thickness; omnidirectional, low-frequency sound insulation; broad bandwidth; and high-performance ventilation has great potential in architectural acoustics and noise control.

Quantitative analysis of low frequency acoustic characteristics for reverse horn by bottleneck effect analogy method

2019 ◽  
Vol 33 (16) ◽  
pp. 1950177
Author(s):  
Xiao Liang ◽  
Jiu Hui Wu ◽  
Zhuo Zhou ◽  
Zhe Chen
Keyword(s):  
Quantitative Analysis ◽  
Acoustic Waves ◽  
Low Frequency ◽  
Sound Insulation ◽  
Simple Method ◽  
Acoustic Characteristics ◽  
Bottleneck Effect ◽  
Sound Energy ◽  
Frequency Sound ◽  
Theoretical Results

Reverse horn as one of the Acoustic Black Hole (ABH) structures can be used to effectively reduce low frequency acoustic waves by focusing the sound energy. The sound waves in relatively low frequency range are focused on the tip of reverse horn, and most sound energy cannot flow out from the reverse horn’s tip. In this paper, we propose a quantitative analysis method by the bottleneck effect analogy to research the low frequency acoustic characteristics of reverse horn. Our theoretical results show that the low frequency sound wave can be focused on the tip of reverse horn, and the transmission coefficient of low frequency is proportional to the 3 power law of the reverse horn tip’s diameter. The experimental results verified our theoretical results. And the sound insulation property is studied by experiments. It is noteworthy that the insulation coefficient of two levels reverse horn whose second level tip’s diameter [Formula: see text] mm, is more than 0.92, and can increase further with the decrease of the second level horn tip’s diameter. It provides an effective and simple method for quantitatively analyzing the low frequency acoustic characteristics of the reverse horn. The proposed reverse horn has great potential applications for low frequency sound insulation control.

Sound energy harvesting using an acoustic grating

2015 ◽  
Vol 117 (10) ◽  
pp. 104502 ◽  
Author(s):  
Xiao-Bin Cui ◽  
Cheng-Ping Huang ◽  
Jun-Hui Hu
Keyword(s):  
Energy Harvesting ◽  
Sound Energy

A brief review of sound energy harvesting

Nano Energy ◽  
2019 ◽  
Vol 56 ◽  
pp. 169-183 ◽  
Author(s):  
Jaehoon Choi ◽  
Inki Jung ◽  
Chong-Yun Kang
Keyword(s):  
Energy Harvesting ◽  
Sound Energy

Develop a vibration based sound energy harvesting in charging mobile devices

2020 ◽  
pp. 1-21
Author(s):  
Mahidur R. Sarker ◽  
Ramizi Mohamed ◽  
Mohamad Hanif Md Saad ◽  
Muhammad Tahir ◽  
Aini Hussain
Keyword(s):  
Energy Harvesting ◽  
Mobile Devices ◽  
Sound Energy
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