Measures to improve residential sound insulation property in severe cold region

2014 ◽  
pp. 491-494
Keyword(s):  
Sound Insulation ◽  
Cold Region ◽  
Insulation Property

Study on Properties of Foam Concrete Based on Fractal Theory

2011 ◽  
Vol 194-196 ◽  
pp. 1916-1919 ◽  
Author(s):  
Wen Ling Tian ◽  
Jiang Bo Yang ◽  
Xiao Yan Zhao
Keyword(s):  
Fractal Dimension ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Fractal Theory ◽  
High Strength ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Thermal Insulation Property

Foam concrete is provided with light weight, thermal insulation, sound insulation and fire resistance, good seismic performance and other characteristics. To improve properties of foam concrete microstructure is studied with the help of fractal theory, fractal dimension related to mechanical properties and thermal performance of foam concrete is calculated by MATLAB language program. The results indicate that the microstructure of foam concrete showed significant fractal character, the fractal dimension is between 1.3 and 2.0. Apparent density, 28d compressive strength, and thermal conductivity decreases with the increase of fly ash and foaming agent content, fractal dimension increased. Formulas of fractal dimension and the fly ash, foaming agent content were established. Foam concrete with low density, high strength, and good thermal insulation property will be prepared conducted by the formulas.

Acoustic performance prediction of a multilayered finite cylinder equipped with porous foam media

2020 ◽  
Vol 26 (11-12) ◽  
pp. 899-912 ◽  
Author(s):  
Hamed Darvish Gohari ◽  
MohamdReza Zarastvand ◽  
Roohollah Talebitooti
Keyword(s):  
Transmission Loss ◽  
Shear Deformation Theory ◽  
Sound Transmission ◽  
Double Fourier Series ◽  
Finite Cylinder ◽  
Sound Insulation ◽  
Transverse Displacement ◽  
Sound Transmission Loss ◽  
Insulation Property ◽  
Longitudinal Modes

This paper presents an analytical model to embed porous materials in a finite cylindrical shell in order to obtain the sound transmission loss coefficient. Although the circumferential modes are considered only for calculating the amount of the transmitted noise through an infinitely long cylinder, the present study employs the longitudinal modes in addition to circumferential ones to analyze the vibroacoustic performance of a simply supported cylinder subjected to the porous core based on the first order shear deformation theory. To achieve this goal, the structure is immersed in a fluid and excited by an acoustic wave. In addition, the acoustic pressures and the displacements are developed in the form of double Fourier series. Since these series consist of infinite modes, it is essential to terminate this process by considering adequate modes. Hence, the convergence checking algorithm is employed in the form of some three-dimensional configurations with respect to length, frequency and radius. Afterwards, some figures are plotted to confirm the accuracy of the present formulation. In these configurations, the obtained sound transmission loss from the present study is compared with that of the infinite one. It is shown that by increasing the length of the structure, the results are approached to sound transmission loss of the infinite shells. Moreover, a new approach is proposed to show the transverse displacement of a finite poroelastic cylinder at different frequencies. Based on the outcomes, it is found that by enhancing the length of the poroelastic cylinder, the amount of the transmitted sound into the structure is reduced at the high frequency domain. However, the sound insulation property of the structure is improved at the low frequency region when the radius of the shell is decreased.

Structural-Function Integration Optimization of Vacuum Insulation Panel in Construction Area

2013 ◽  
Vol 591 ◽  
pp. 329-333
Author(s):  
Liang Jiang ◽  
Yi Wang Bao ◽  
Xiao Gen Liu
Keyword(s):  
Sound Insulation ◽  
Structural Function ◽  
Insulation Property ◽  
Vacuum Insulation ◽  
Building Insulation ◽  
New Construction ◽  
Function Integration ◽  
The One ◽  
And Function ◽  
Vacuum Insulation Panel

Vacuum insulation panel is the one type of the insulation materials. The characteristics of this material are not only low thermal conductivity, good sound insulation, energy efficient, environmental protection but also with no ODS material. However, the inadequate mechanical properties of this material limit its application of insulation in construction . Thus, this research proposed the uses of the connection of structure and function of vacuum insulation panel in construction , and tested against its Sound Insulation Property. new construction sound insulation standards was adopted for evaluating the result of Sound Insulation Property to study the building insulation performance of the vacuum insulation composites

Sound insulation property of membrane-type acoustic metamaterials carrying different masses at adjacent cells

2013 ◽  
Vol 114 (6) ◽  
pp. 063515 ◽  
Author(s):  
Yuguang Zhang ◽  
Jihong Wen ◽  
Honggang Zhao ◽  
Dianlong Yu ◽  
Li Cai ◽  
...  
Keyword(s):  
Sound Insulation ◽  
Acoustic Metamaterials ◽  
Insulation Property ◽  
Membrane Type

scholarly journals Effect of Glass-Beads on Sound Insulation Properties of Nonwoven Fabrics

2012 ◽  
Vol 7 (1) ◽  
pp. 155892501200700 ◽  
Author(s):  
Mevlut Tascan ◽  
Katharine Lyon Gaffney
Keyword(s):  
Surface Area ◽  
Nonwoven Fabric ◽  
Total Surface Area ◽  
Glass Beads ◽  
Sound Insulation ◽  
Insulation Material ◽  
Insulation Property ◽  
Nonwoven Fabrics ◽  
Significant Difference ◽  
Materials Used

Nonwovens are very important sound absorption materials used by the automotive and building industries. One of the most important fabric parameters that affect the sound insulation and absorption properties is the surface area. Higher surface area is often achieved by using low-diameter fibers in the insulation material. This research was done to prove that neither the thickness nor the weight of the material is as important as the total surface area of the fabric. Glass beads with 0.1mm, 0.5mm and 2.5mm sizes, which do not contribute considerably to the total surface area of the fabric, were imbedded into cross-lapped and needlepunched nonwoven structures. These beads were added in weight percentages of 25%, 50%, 75%, 100% and 200%. Sound insulation of glass bead imbedded nonwoven fabrics was tested using Clemson Boston Sound Insulation Tester. It was found that the micro-glass beads did not have a large impact on the sound insulation, as they do not contribute to the surface area of the nonwoven fabric. The samples with 0.1mm beads performed slightly better than samples with larger beads but not enough to make a significant difference. Since surface area is the major parameter that affects sound insulation, simply increasing the weight does not affect the sound insulation property of the material.

Sound Insulation Property of Warp Knitted Fabrics

2012 ◽  
Vol 535-537 ◽  
pp. 1429-1432
Author(s):  
Kun Yang ◽  
Tian Sheng Ye
Keyword(s):  
Sound Wave ◽  
Sound Insulation ◽  
Test Device ◽  
Insulation Property ◽  
Knitted Fabrics ◽  
Solid Structure ◽  
Thin Structure ◽  
Insulation Effect

In this study, a test device was designed and established for evaluating the sound insulation of fabrics, and six warp knitted fabrics with different parameters were chosen and tested. The results show that these fabrics have different sound insulation effect to various sound wave frequencies, and normally, the fabric with solid structure has better sound insulation effect that the fabric with thin structure, but the effect of latter fabric can be improved by using some treatments.

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