Preparation and Sound Absorption Property of Al-Si12 Alloy Foam Core Muffler

2011 ◽  
Vol 183-185 ◽  
pp. 1687-1691 ◽  
Author(s):  
Ying Wu Wang ◽  
Xiao Qing Zuo ◽  
Xian Ning Chen
Keyword(s):  
Sound Absorption ◽  
Pore Diameter ◽  
Noise Control ◽  
Foam Core ◽  
Absorption Property ◽  
Filtration Method ◽  
Diameter Range ◽  
Absorbing Materials

Al-Si12 alloy foams were fabricated by filtration method, and the Al-Si12 alloy foam core mufflers were made by using the fabricated Al-Si12 alloy foams. The preparation and sound absorption property of Al-Si12 alloy foam core muffler has been studied. The results show that sound absorption property of Al-Si12 alloy foam core muffler increases with the decreasing of pore diameter and the widening of the pore diameter range of Al-Si12 alloy foam core. Being superior to conventional sound-absorbing materials core mufflers, Al-Si12 alloy foam core muffler especially fits in noise control in hot, wet, and open-air environments.

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.

scholarly journals Sound absorption property of nonwoven based composites

2013 ◽  
Vol 13 (4) ◽  
pp. 150-155 ◽  
Author(s):  
Eulalia Gliścińska ◽  
Marina Michalak ◽  
Izabella Krucińska
Keyword(s):  
Absorption Coefficient ◽  
High Frequency ◽  
Sound Absorption ◽  
Thermoplastic Composites ◽  
Absorption Property ◽  
Optimal Conditions ◽  
Composite Surface ◽  
Absorbing Materials ◽  
Thermal Pressing ◽  
Materials Used

Abstract Sound absorbing materials used to provide optimal conditions in rooms can be applied in the form of textiles with a special structure such as nonwovens or fibre-containing composites. Nonwovens can be successfully used to make thermoplastic composites by thermal pressing. This paper presents the comparison of the sound absorbing properties of needled nonwovens and composites made from them. Composites with various densities can be made of nonwovens with various percentage contents of filling and matrix fibres. The sound absorption by composites with similar thickness, about several millimetres, is slightly lower than that by the laminar nonwoven packs used for their making. The optimal content of the filling fibres in the composite, when its sound absorption coefficient reaches the highest values, is at the level of 10 wt.%. With the increase in the content of filling fibres the composite density decreases. In the case of the composite with 10 wt.% of filling fibres, its density is the highest among the composites investigated, and the increase in absorption of high-frequency sounds is the highest. Imparting a relief with a protrusion diameter over 10 mm to the composite surface, we can increase the sound absorption of that composite.

Effect of Aggregate Size and Gradation on the Ceramsite Sound-Absorbing Materials

2011 ◽  
Vol 216 ◽  
pp. 450-457
Author(s):  
Xiang Yu Luo ◽  
Wen Fang Li ◽  
Xue Li Jin
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
Sound Absorption ◽  
Pore Diameter ◽  
Aggregate Size ◽  
Effective Porosity ◽  
Diameter Distribution ◽  
Frequency Noise ◽  
Sound Waves ◽  
Absorbing Materials

In this paper, the effect of ceramsite aggregate size and gradation on the sound absorption and mechanical properties of the materials were studied and the relationship between material’s pore structure and its sound absorption were discussed. It can be found from the results that the sound absorption and mechanical properties of the ceramsite sound-absorbing materials increase with the content of the fine ceramsite increased due to the decrease of the median pore diameter of the ceramsite sound-absorbing materials where the improvement of the sound absorption at the high frequency band is more significant suggesting that fine pores have a better sound-absorbing effect for high-frequency noise. Higher effective porosity doesn’t mean better sound absorption, because materials with coarse pores have shorter internal routes for sound waves and less friction during sound waves passing through pores, which conversely decreases the material’s sound absorption. Ceramsite with higher internal porosity and more uniform pore diameter distribution can produce materials with better sound absorption.

Effect of Coating Thickness on Sound Absorption Property of Four Wood Species Commonly Used for Piano Soundboards

2020 ◽  
Vol 52 (1) ◽  
pp. 28-43 ◽  
Author(s):  
Wei Xu ◽  
Xiaoyang Fang ◽  
Jiatong Han ◽  
Zhihui Wu ◽  
Jilei Zhang
Keyword(s):  
Coating Thickness ◽  
Wood Species ◽  
Sound Absorption ◽  
Absorption Property

scholarly journals Enhanced electromagnetic wave absorption property of binary ZnO/NiCo2O4 composites

2021 ◽  
Author(s):  
Bin Du ◽  
Mei Cai ◽  
Xuan Wang ◽  
Junjie Qian ◽  
Chao He ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Properties ◽  
Hydrothermal Reaction ◽  
Absorption Property ◽  
Absorption Properties ◽  
Promising Candidate ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Minimum Reflection Loss

AbstractNowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo2O4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo2O4-7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo2O4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.

Fabrication of Ultra Low-Density Binderless Sandwiching Materials by Rapid Steam Injection

2016 ◽  
Vol 852 ◽  
pp. 1482-1487
Author(s):  
Fan Cheng ◽  
Yu Hao Jiang ◽  
Jin Bo Chen ◽  
Peng Bo Lu ◽  
Ling Feng Su ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Sound Absorption ◽  
Building Materials ◽  
Bending Strength ◽  
Injection Pressure ◽  
Steam Injection ◽  
Low Density ◽  
Absorption Property ◽  
Injection Process ◽  
Injection Technology

Eco-friendly building materials with perfect thermal insulation & sound absorption property have become intriguing and eye-catching in recent years. In this work, the ultra low-density binderless sandwiching materials were firstly fabricated with ultra low-density of 60-80 kg/m3 by self-designed rapid steam injection technology. The main experimental factor of density, holding time, transmission time, steam injection pressure and fiber’s dimension was respectively investigated to their effects on formation of the new building materials. IR, Py GC-MS and AFM analysis were performed to study the mechanism of binderless sandwiching materials under steam injection process. The bending strength, thermal insulation & sound absorption property of the new materials were also studied. This new building material with no resin use and no formaldehyde release is expected to be reserved as the sandwich for designing thermal insulation & noise reduction building materials.

Investigation of sound absorption properties of nonwoven webs produced from chicken feather fibers

2018 ◽  
Vol 48 (10) ◽  
pp. 1616-1635 ◽  
Author(s):  
Nazim Paşayev ◽  
Süreyya Kocatepe ◽  
Nesli Maraş
Keyword(s):  
Sound Absorption ◽  
Transmission Loss ◽  
Sound Insulation ◽  
Chicken Feather ◽  
Modern Life ◽  
Surface Areas ◽  
Absorbing Materials ◽  
Feather Fibers ◽  
Negative Side Effects ◽  
Bonding Method

As a consequence of modern life and technology, noise causes many negative side effects, especially with regard to health. Today, the presence of acoustic problems in transport vehicles such as airplanes, cars and train wagons has become one of the major problems of modern life. Many methods and materials have been developed to provide acoustic comfort in indoor spaces. One of them is the development and application of sound-absorbing materials. Nonwoven webs, which are considered to be the most ideal materials for sound insulation, have micron-sized pores as well as large surface areas. Among these materials, materials with double-layered porosity have greater effect. In recent years, researchers are increasingly turning to the development of sound-absorbing materials from production waste and natural materials that are easily decomposed in the environment. In this study, the sound-absorbing properties of nonwoven webs produced from chicken feather fibers, a by-product in chicken production and a significant amount of waste, were investigated. For this purpose, nonwoven web samples with different parameters were produced by using different binding materials by using thermal bonding method. The sound absorption coefficient and sound transmission loss values of the samples were measured and evaluated. As a result of the analyses, the influence parameters such as thickness, bulk density and porosity on the sound insulation properties of the produced samples was revealed. The assumptions concerning the mechanism of sound insulation of nonwoven webs produced from chicken feather fibers are detailed. Studies have shown that nonwoven webs from chicken feather fibers can be used as soundproof materials because of their good sound-absorbing properties.

scholarly journals INFLUENCES OF KIND OF FINE AGGREGATE AND SPECIMEN THICKNESS ON SOUND ABSORPTION PROPERTY OF POROUS MORTAR

2016 ◽  
Vol 70 (1) ◽  
pp. 564-571
Author(s):  
Takeyuki NAGATO ◽  
Makoto YAMAGUCHI ◽  
Reiji TOMIKU ◽  
Noriko OKAMOTO
Keyword(s):  
Sound Absorption ◽  
Specimen Thickness ◽  
Fine Aggregate ◽  
Absorption Property
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