Acoustic Tuning of Gas-Liquid Scheme Injectors for Acoustic Absorption in a Rocket Combustor

2006 ◽  
Author(s):  
Chae Hoon Sohn ◽  
I-Sun Park
Keyword(s):  
Acoustic Absorption ◽  
Acoustic Tuning

Low-frequency sound absorption of a tunable multilayer composite structure

2021 ◽  
pp. 107754632110082
Author(s):  
Hanbo Shao ◽  
Jincheng He ◽  
Jiang Zhu ◽  
Guoping Chen ◽  
Huan He
Keyword(s):  
Porous Material ◽  
Absorption Coefficient ◽  
Composite Structure ◽  
Low Frequency ◽  
Acoustic Absorption ◽  
Multilayer Composite ◽  
Absorption Frequency ◽  
Acoustic Absorption Coefficient ◽  
Simulation And Experiment ◽  
Single Material

Our work investigates a tunable multilayer composite structure for applications in the area of low-frequency absorption. This acoustic device is comprised of three layers, Helmholtz cavity layer, microperforated panel layer, and the porous material layer. For the simulation and experiment in our research, the absorber can fulfill a twofold requirement: the acoustic absorption coefficient can reach near 0.8 in very low frequency (400 Hz) and the range of frequency is very wide (400–3000 Hz). In all its absorption frequency, the average of the acoustic absorption coefficient is over 0.9. Besides, the absorption coefficient can be tunable by the scalable cavity. The multilayer composite structure in our article solved the disadvantages in single material. For example, small absorption coefficient in low frequency in traditional material such as microperforated panel and porous material and narrow reduction frequency range in acoustic metamaterial such as Helmholtz cavity. The design of the composite structure in our article can have more wide application than single material. It can also give us a novel idea to produce new acoustic devices.

THE TEMPERATURE DISTRIBUTION PRODUCED BY ACOUSTIC ABSORPTION: I. MACROSCOPIC TREATMENT

1966 ◽  
Vol 44 (12) ◽  
pp. 3001-3011 ◽  
Author(s):  
S. Simons
Keyword(s):  
Temperature Distribution ◽  
Acoustic Wave ◽  
Numerical Results ◽  
Time Dependent ◽  
Acoustic Absorption ◽  
Space And Time

A calculation is given of the temperature distribution in space and time produced by the absorption of an acoustic wave propagated inside a medium, under conditions in which the situation may be described macroscopically. The problem is considered for various geometries, and for both constant and time-dependent energies of the incident acoustic wave. Numerical results are obtained, and a discussion is given of their relevance to various experiments.

Optimized Air Intake for a Turbocharged Engine Taking into Account Water-Cooled Charge Air Cooler Reflective Properties for Acoustic Tuning

2013 ◽  
Author(s):  
Haitham Mezher ◽  
Jerome Migaud ◽  
Vincent Raimbault ◽  
Jean-Gabriel Lelong ◽  
David Chalet ◽  
...  
Keyword(s):  
Air Cooler ◽  
Air Intake ◽  
Acoustic Tuning

scholarly journals Low-frequency acoustic absorption of viscoelastic coating with various shapes of scatterers

2012 ◽  
Vol 61 (21) ◽  
pp. 214302
Author(s):  
Lyu Lin-Mei ◽  
Wen Ji-Hong ◽  
Zhao Hong-Gang ◽  
Meng Hao ◽  
Wen Xi-Sen
Keyword(s):  
Low Frequency ◽  
Acoustic Absorption

scholarly journals Acoustic Absorption with Material in Pieces and Back Air Layer

2019 ◽  
Vol 105 (3) ◽  
pp. 555-565
Author(s):  
David Caballol ◽  
Álvaro P. Raposo
Keyword(s):  
Acoustic Absorption

scholarly journals Comparasion of prediction and measurement methods for sound insulation of lightweight partitions

2012 ◽  
Vol 10 (2) ◽  
pp. 155-167 ◽  
Author(s):  
Momir Prascevic ◽  
Dragan Cvetkovic ◽  
Darko Mihajlov
Keyword(s):  
Transmission Loss ◽  
Road Traffic ◽  
Theoretical Models ◽  
Measurement Methods ◽  
Experimental Results ◽  
Sound Insulation ◽  
Acoustic Absorption ◽  
Noise Levels ◽  
Overall Design ◽  
Acoustic Comfort

It is important to know the sound insulation of partitions in order to be able to compare different constructions, calculate acoustic comfort in apartments or noise levels from outdoor sources such as road traffic, and find engineer optimum solutions to noise problems. The use of lightweight partitions as party walls between dwellings has become common because sound insulation requirements can be achieved with low overall surface weights. However, they need greater skill to design and construct, because the overall design is much more complex. It is also more difficult to predict and measure of sound transmission loss of lightweight partitions. There are various methods for predicting and measuring sound insulation of partitions and some of them will be described in this paper. Also, this paper presents a comparison of experimental results of the sound insulation of lightweight partitions with results obtained using different theoretical models for single homogenous panels and double panels with and without acoustic absorption in the cavity between the panels.

scholarly journals Acoustic Absorption and Dynamic Viscosity in Polymers

1966 ◽  
Vol 39 (6) ◽  
pp. 1229-1229
Author(s):  
Joseph L. Hunter ◽  
Henry D. Dardy ◽  
P. R. Derdul
Keyword(s):  
Dynamic Viscosity ◽  
Acoustic Absorption
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