Sound Absorption Properties of Al Foam

2005 ◽  
Vol 486-487 ◽  
pp. 468-471 ◽  
Author(s):  
Sang Youl Kim ◽  
Soo Han Park ◽  
Yong Su Um ◽  
Bo Young Hur
Keyword(s):  
Sound Absorption ◽  
Aluminum Foam ◽  
Air Gap ◽  
Absorption Property ◽  
Absorption Properties ◽  
Al Foam ◽  
High Sound ◽  
Very High

Aluminum foam with 0.2 g/cm3 density showed a good sound absorption property at frequencies higher than 2000 Hz. Compressed aluminum foam with an air gap of 50 mm or higher exhibited a very high sound absorption property near 400 Hz.

The Progress in Aluminum Foam Research in China

2012 ◽  
Vol 457-458 ◽  
pp. 253-256 ◽  
Author(s):  
Guang Chun Yao ◽  
Huan Liu ◽  
Bin Na Song
Keyword(s):  
Energy Absorption ◽  
Sound Absorption ◽  
Laboratory Experiments ◽  
Aluminum Foam ◽  
Pore Diameter ◽  
Bending Strength ◽  
Steel Plate ◽  
Absorption Energy ◽  
Al Foam ◽  
Impact Bending

The aluminum foam materials have studied for the last 15 years in China, from laboratory experiments to industrialized scale. we can manufacture 800mm×2000mm aluminum foam board products. The essential parameters of our aluminum foam product are as follows, density: 0.3~0.6g/cm3; porosity: 77%~88%; pore diameter 5MPa. Some properties of aluminium foam materials were studied such as sound absorption, energy absorption, impact bending strength of aluminum (steel) plate/Al foam sandwich, etc.

Analysis of the Influence of Static Flow Resistance on the Sound Absorption Properties of Aluminum Foam

2012 ◽  
Vol 535-537 ◽  
pp. 1459-1462 ◽  
Author(s):  
Huai Qian Bao ◽  
Ning Zhang ◽  
Xue Gang Hou
Keyword(s):  
Sound Absorption ◽  
Flow Resistance ◽  
Aluminum Foam ◽  
Circular Tube ◽  
Peak Frequency ◽  
Absorption Properties ◽  
Absorption Frequency ◽  
Porous Aluminum ◽  
Static Flow ◽  
Resistance Value

For the complexity of the internal microstructure of porous aluminum foam, on the basis of Rayleigh-Kirchhoff circular tube model, taking viscosity loss and thermal transmission, the paper establishes a simplified theoretical model for sound absorption properties of aluminum foam. The paper also calculates and analyzes the influence of Static flow resistance on the sound absorption properties in the rigidity and cavity backing. The results show that the peak frequency moves to lower with the increasing of the thickness of the air layer. What’s more, there is a direct corresponding relation between flow resistance and the best sound absorption frequency range of aluminum foam. In a reasonable range of flow resistance value, the capability of sound absorption reach optimal, Aluminum Foam won’t have fine sound absorption capability if the value of flow resistance is too big or small.

Sound Absorption Properties of Polyester Fibers Needle-Punched Nonwoven Fabrics

2011 ◽  
Vol 332-334 ◽  
pp. 1300-1303
Author(s):  
Ke Tian Guan ◽  
Xu Pin Zhuang ◽  
Xiao Ning Jiao ◽  
Men Qin Li ◽  
Hong Jun Li ◽  
...  
Keyword(s):  
Surface Structure ◽  
Standing Wave ◽  
Sound Absorption ◽  
Fiber Diameter ◽  
Absorption Property ◽  
Wave Tube ◽  
Absorption Properties ◽  
Nonwoven Fabrics ◽  
Polyester Fibers ◽  
Standing Wave Tube

Polyester fiber needle-punched nonwovens with different structures were manufactured and their sound absorption properties were examined using the standing wave tube method. The results show that the sound absorption property of the nonwovens depends on their thickness, needling intensity, fiber diameter and surface structure.

Preparation and Sound Absorption Coefficient Test of Aluminum Foam with CaO Granules Infiltrating Agent

2018 ◽  
Vol 933 ◽  
pp. 55-60
Author(s):  
Yong Zhang ◽  
Zong Min Chen ◽  
Zhao Jun Wang ◽  
Jing Hui Liu
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Aluminum Foam ◽  
Low Frequency ◽  
Processing Parameters ◽  
Sound Absorption Coefficient ◽  
Pressure Infiltration ◽  
Pure Alcohol ◽  
Infiltration Pressure ◽  
High Sound

Three kinds of aluminum foam of different pore sizes were prepared with a tailor-made low-pressure infiltration device. CaO granules in three sizes (0.45~0.71mm,0.71~090mm and 1.25~1.60mm) were selected as infiltrating agents. The processing parameters were as follows: granules preheat temperature of 700 °C,infiltration pressure of 0.04 MPa and aluminum liquid temperature of 720 °C. In order to improve the removal performance and porosity, mixture of CaO powder of finer than 300 mesh and pure alcohol was mixed uniformly with granules, which made the slurry-coating granules conformal contacts rather than point contacts as in the traditional infiltration method. The testing results show that among all aluminum foam specimens tested with transfer function methods, two kinds have high sound absorption coefficient in low frequency (250~1600Hz).

Optimization of Aluminum Foam by Simulated Annealing

2012 ◽  
Vol 573-574 ◽  
pp. 1187-1192
Author(s):  
Xiao Hong Zhang ◽  
Jiang Tao Zhang
Keyword(s):  
Simulated Annealing ◽  
Sound Absorption ◽  
Optimization Design ◽  
Aluminum Foam ◽  
Simulated Annealing Algorithm ◽  
Absorption Properties ◽  
Cavity Structure ◽  
Annealing Algorithm ◽  
Two Parameters ◽  
Single Cavity

According to two parameters combination of the material thickness and air-gap depth, from the angle of pure optimization, this paper obtained the optimal parameters of single cavity and double cavity structure by using the simulated annealing algorithm for single cavity and double cavity of aluminum foam sound absorption structure of systematically optimization design at 100-4000HZ frequency band. Finally, studying effect of increasing the number of cavity on aluminum foam sound absorption properties.

Acoustic Absorption Characteristics of Closed Cell Aluminium Foam

2011 ◽  
Vol 110-116 ◽  
pp. 1145-1149 ◽  
Author(s):  
Joyjeet Ghose ◽  
Vinay Sharma ◽  
Surender Kumar
Keyword(s):  
Sound Absorption ◽  
Aluminium Foam ◽  
Absorption Property ◽  
Optimal Thickness ◽  
Absorption Properties ◽  
Test Conditions ◽  
Closed Cell ◽  
Absorbing Materials ◽  
Difficult Situations ◽  
Absorption Characteristics

Experimental investigation of sound absorption characteristics of aluminium foam is carried out under laboratory test conditions. The studies revealed that the developed aluminium foam have excellent sound absorption properties and is comparable with other sound absorbing materials. Excellent sound absorption property coupled with good mechanical properties makes this material ideal for sound absorption under difficult situations. Experimental results revealed that the thickness of the specimen affects the sound absorption properties of the material, and there exists an optimal thickness, at which sound absorption coefficient is maximum. Experimental evidence showed that presence of damaged cell edges, open and/or semi-open cells in the specimen surface, enhances the sound absorption capability of the material.

Effect of Surface Modification on the Sound Absorption Behavior of Open Celled Aluminum Foams

2014 ◽  
Vol 783-786 ◽  
pp. 1509-1512 ◽  
Author(s):  
Yun Jie Li ◽  
Yue Lu Ren ◽  
Zhen Dong Li ◽  
Fu Sheng Han
Keyword(s):  
Phase Composition ◽  
Cell Walls ◽  
Sound Absorption ◽  
Flow Resistance ◽  
Aluminum Foams ◽  
Absorption Properties ◽  
Low Frequencies ◽  
Al Foam ◽  
Effect Of Surface ◽  
Al Foams

In the present study, needle like micro-Co3O4 rods were synthesized on the cell walls of open celled Al foam. The microstructure and phase composition of micro-rods and sound absorption properties of resultant samples were characterized. Compared with original Al foams, the modified ones showed enhanced sound absorption capacities, particularly at low frequencies, which were more obvious as the length of Co3O4 rods increased. The improvement is related to increased air flow resistance owing to increased roughness of the cell walls.

Sound Absorption Properties of Al Foam

2005 ◽  
pp. 468-471
Author(s):  
Sang Youl Kim ◽  
Soo Han Park ◽  
Yong Su Um ◽  
Bo Young Hur
Keyword(s):  
Sound Absorption ◽  
Absorption Properties ◽  
Al Foam

Improving Sound Absorption Property of Polyurethane Foams by Adding Tea-Leaf Fibers

2012 ◽  
Vol 37 (4) ◽  
pp. 515-520 ◽  
Author(s):  
Bülent Ekici ◽  
Aykut Kentli ◽  
Haluk Küçük
Keyword(s):  
Polyurethane Foam ◽  
Sound Absorption ◽  
Significant Contribution ◽  
Polyurethane Foams ◽  
Absorption Property ◽  
Luffa Cylindrica ◽  
Absorption Properties ◽  
Environmental Friendly ◽  
Tea Leaf ◽  
Pu Foams

Abstract The sound absorption property of polyurethane (PU) foams loaded with natural tea-leaf fibers and luffa cylindrica (LC) has been studied. The results show a significant improvement in the sound absorption property parallel to an increase in the amount of tea-leaf fibers (TLF). Using luffa-cylindrica as a filler material improves sound absorption properties of soft foam at all frequency ranges. Moreover, an increase in the thickness of the sample resulted in an improvement of the sound absorption property. It is pleasing to see that adding tea-leaf fibers and luffa-cylindrica to the polyurethane foam demonstrate a significant contribution to sound absorption properties of the material and it encourages using environmental friendly products as sound absorption material in further studies.

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