Perfect sound absorption of Helmholtz resonators with embedded channels in petal shape

2021 ◽  
Vol 130 (13) ◽  
pp. 135102
Author(s):  
Mingyu Duan ◽  
Chenlei Yu ◽  
Wei He ◽  
Fengxian Xin ◽  
Tian Jian Lu
Keyword(s):  
Sound Absorption ◽  
Helmholtz Resonators ◽  
Petal Shape

Sound absorption of microperforated panel mounted with helmholtz resonators

2016 ◽  
Vol 114 ◽  
pp. 260-265 ◽  
Author(s):  
Xiao-Ling Gai ◽  
Tuo Xing ◽  
Xian-Hui Li ◽  
Bin Zhang ◽  
Wen-Jiang Wang
Keyword(s):  
Sound Absorption ◽  
Helmholtz Resonators

Thermoacoustically controlled Helmholtz resonators

2013 ◽  
Vol 227 (11) ◽  
pp. 2563-2568
Author(s):  
Konstantin I Matveev
Keyword(s):  
Power Systems ◽  
Thermal Stratification ◽  
Sound Absorption ◽  
Element Model ◽  
Temperature Gradients ◽  
Acoustic Oscillations ◽  
Helmholtz Resonators ◽  
Lumped Element ◽  
Effects Of Temperature ◽  
Lumped Element Model

Helmholtz resonators and their modifications are commonly applied for suppressing unwanted sound, including acoustic oscillations in chambers of propulsion and power systems. Sound absorption characteristics of Helmholtz resonators can be enhanced and controlled with a use of thermal stratification in porous insets inside resonators. A simplified lumped-element model for thermoacoustically augmented Helmholtz resonators is developed in this article. Sample calculations illustrate effects of temperature gradients, porosity, positions of porous insets, and locations of resonators inside chambers.

Effects of shape of the neck of classical acoustical resonators on the sound absorption quality for large amplitudes: Experimental results

2020 ◽  
Vol 27 (2) ◽  
pp. 169-181
Author(s):  
Emmanuel Gourdon ◽  
Alireza Ture Savadkoohi ◽  
Bertrand Cauvin
Keyword(s):  
Sound Absorption ◽  
Nonlinear Response ◽  
Experimental Results ◽  
Resonant Frequencies ◽  
Helmholtz Resonators ◽  
Forcing Function ◽  
Amplitude Dependency ◽  
Broadband Frequency

This article presents some experimental results on Helmholtz resonators for large sound amplitudes with two general geometries of their necks: the resonators with classical (cylindrical) and quadratic nonlinear necks. Obtained results for large amplitudes show accelerated amplitude dependency of resonant frequencies of the resonators with modified shape of the neck compared to classical ones. This nonlinear response can be used as a passive controller system with nonlinear restoring forcing function for having broadband frequency absorption.

Acoustic impedance regulation of Helmholtz resonators for perfect sound absorption via roughened embedded necks

2020 ◽  
Vol 117 (15) ◽  
pp. 151904
Author(s):  
Mingyu Duan ◽  
Chenlei Yu ◽  
Zhimin Xu ◽  
Fengxian Xin ◽  
Tian Jian Lu
Keyword(s):  
Acoustic Impedance ◽  
Sound Absorption ◽  
Helmholtz Resonators
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