Results 111 to 120 of about 252,123 (184)

Helmholtz resonators with added porous absorbers

, 1994
International audience ; Helmholtz resonators often are combined with porous materials in order to increase the bandwidth of their resonances. A previous article [1] has treated perforated metal sheet covers on porous absorber layers. The results from this can be applied for normal sound incidence directly to Helmholtz resonators in which absorber ...
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Helmholtz resonator with extended neck

Journal of the Acoustical Society of America, 2003
Acoustic performance of a concentric circular Helmholtz resonator with an extended neck is investigated theoretically, numerically, and experimentally. The effect of length and shape of, and the perforations on the neck extension is examined on the resonance frequency and the transmission loss.
Ahmet Selamet
exaly   +3 more sources

Dual‐Tube Helmholtz Resonator‐Based Triboelectric Nanogenerator for Highly Efficient Harvesting of Acoustic Energy

Advanced Energy Materials, 2019
An acoustic wave is a type of energy that is clean and abundant but almost totally unused because of its very low density. This study investigates a novel dual‐tube Helmholtz resonator‐based triboelectric nanogenerator (HR‐TENG) for highly efficient ...
Xiu Xiao, Peng Xu, Tiancong Zhao
exaly   +2 more sources

Helmholtz resonator with two resonance frequencies by coupling with a mechanical resonator

Journal of Sound and Vibration, 2023
H Hoppen, Felix Langfeldt, O Von Estorff   +2 more
exaly   +2 more sources

Low-frequency broadband sound absorption of the Helmholtz resonator–spiral metasurface

Applied Acoustics
Heow Pueh Lee
exaly   +2 more sources

Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy.

Optics Letters, 2023
In this work, Helmholtz-resonator quartz-enhanced photoacoustic spectroscopy (HR-QEPAS) was developed for trace gas sensing. A pair of Helmholtz resonators with high-order resonance frequency was designed and coupled with a quartz tuning fork (QTF ...
Huijian Luo, Chenglong Wang, Haoyang Lin, Qian Wu, Zhifei Yang, Wenguo Zhu, Y. Zhong, Ruifeng Kan, Jianhui Yu, Huadan Zheng   +9 more
semanticscholar   +1 more source

Low-frequency sound-absorbing metasurface constructed by a membrane-covered and coiled Helmholtz resonator

Journal of Applied Physics, 2023
Achieving broadband absorption of sound waves below 500 Hz with materials of sub-wavelength thickness is significant but still a great challenge in academia and industries.
Qishan Xu, J. Qiao, G. Zhang, Longqiu Li
semanticscholar   +1 more source

METHOD FOR ADJUSTING A HELMHOLTZ RESONATOR AND AN ADJUSTABLE HELMHOLTZ RESONATOR

The Journal of the Acoustical Society of America, 2013
In a method for adjusting a Helmholtz resonator ( 10 ), in which a resonator volume ( 11 ) is connected to a space ( 13 ) to be provided with damping along an axis ( 29 ) via a constriction ( 12 ) having an acoustic impedance, the acoustic impedance of the constriction ( 12 ) is altered in order to adjust the Helmholtz resonator ( 10 ).
Bruno Schuermans, Jaan Hellat
openaire   +1 more source

Theoretical investigation on the acoustic performance of Helmholtz resonator integrated microperforated panel absorber

Applied Acoustics, 2021
Broadband sound absorption at low frequency with minimal space consumption and material cost is a trending research problem in engineering acoustics. Conventional sound absorbers like porous materials and microperforated panels (MPP) are not good enough ...
K. Mahesh, R. Mini
semanticscholar   +1 more source

Broadband and low-frequency sound absorption of modified Helmholtz resonator combined with porous layer addition

Journal of Applied Physics, 2022
In this work, a hybrid acoustic material (HAM) is designed for broadband and low-frequency sound absorption based on the combination of two different materials: a porous layer (melamine foam) and a modified Helmholtz resonator with embedded necks (HRENs).
E. F. Vergara, G. Almeida, L. Barbosa, A. Lenzi, A. Carvalho de Sousa   +4 more
semanticscholar   +1 more source