Influence of foaming and carbon nanotubes on sound transmission loss of wood fiber-low density polyethylene composites

2017 ◽  
Vol 134 (29) ◽  
pp. 45096 ◽  
Author(s):  
Behrouz Neyciyani ◽  
Saeed Kazemi Najafi ◽  
Ismaeel Ghasemi
Keyword(s):  
Carbon Nanotubes ◽  
Transmission Loss ◽  
Wood Fiber ◽  
Sound Transmission ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Sound Transmission Loss ◽  
Polyethylene Composites

Foam morphology and sound transmission loss of foamed wood flour/low-density polyethylene (LDPE)/nanoclay composites

2017 ◽  
Vol 31 (11) ◽  
pp. 1470-1482 ◽  
Author(s):  
Fariba Molkara ◽  
Saeed Kazemi Najafi ◽  
Ismail Ghasemi
Keyword(s):  
Transmission Loss ◽  
Wood Flour ◽  
Sound Transmission ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Sound Transmission Loss ◽  
Average Cell Size ◽  
Average Cell ◽  
Molding Method ◽  
Foam Morphology

In this research, the effects of foaming and of nanoclay on foam morphology and soundproofing of wood flour/low-density polyethylene (LDPE) composites were investigated. For this purpose, LDPE, wood flour, foaming agent, and nanoclay were mixed in an internal mixer to produce test samples. The standard circular samples were made using compression molding method in a hot press machine. Sound transmission loss (STL) was measured by an impedance tube. Results showed that foaming and nanoclay increase the STL of the composites at frequencies above 2000 Hz. The biggest increase in STL has been found for the foamed composites containing nanoclay. The addition of nanoclay decreased the average cell size and increased the cell density of foamed composites.

scholarly journals Sound Transmission Loss Enhancement in an Inorganic-Organic Laminated Wall Panel Using Multifunctional Low-Density Nanoporous Polyurea Aerogels: Experiment and Modeling

2018 ◽  
Vol 20 (6) ◽  
pp. 1700937 ◽  
Author(s):  
Sadeq Malakooti ◽  
Habel Gitogo Churu ◽  
Alison Lee ◽  
Saman Rostami ◽  
Samuel John May ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Low Density ◽  
Sound Transmission Loss ◽  
Wall Panel

scholarly journals Analysis of the transmission loss of double-leaf panels with an equivalent spring–mass model for studs

2020 ◽  
Vol 37 ◽  
pp. 126-133
Author(s):  
Yuan-Wei Li ◽  
Chao-Nan Wang
Keyword(s):  
Distribution Curve ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Experimental Results ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Mass Model ◽  
Steel Stud ◽  
Panel Thickness ◽  
Stiffness Distribution

Abstract The purpose of this study was to investigate the sound insulation of double-leaf panels. In practice, double-leaf panels require a stud between two surface panels. To simplify the analysis, a stud was modeled as a spring and mass. Studies have indicated that the stiffness of the equivalent spring is not a constant and varies with the frequency of sound. Therefore, a frequency-dependent stiffness curve was used to model the effect of the stud to analyze the sound insulation of a double-leaf panel. First, the sound transmission loss of a panel reported by Halliwell was used to fit the results of this study to determine the stiffness of the distribution curve. With this stiffness distribution of steel stud, some previous proposed panels are also analyzed and are compared to the experimental results in the literature. The agreement is good. Finally, the effects of parameters, such as the thickness and density of the panel, thickness of the stud and spacing of the stud, on the sound insulation of double-leaf panels were analyzed.

Chemical modification of waste oil fly ash for improved mechanical and thermal properties of low density polyethylene composites

2011 ◽  
Vol 18 (6) ◽  
pp. 2275-2284 ◽  
Author(s):  
Muhammad J. Khan ◽  
Abdulhadi A. Al-Juhani ◽  
Reyad Shawabkeh ◽  
Anwar Ul-Hamid ◽  
Ibnelwaleed A. Hussein
Keyword(s):  
Thermal Properties ◽  
Fly Ash ◽  
Chemical Modification ◽  
Low Density Polyethylene ◽  
Mechanical And Thermal Properties ◽  
Low Density ◽  
Waste Oil ◽  
Oil Fly Ash ◽  
Polyethylene Composites
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