Microstructure and performance characteristics of acoustic insulation materials from post-consumer recycled denim fabrics

2020 ◽  
pp. 152808372094074
Author(s):  
Shafiqul Islam ◽  
Magdy El Messiry ◽  
Partha Pratim Sikdar ◽  
Joshua Seylar ◽  
Gajanan Bhat
Keyword(s):  
Transmission Loss ◽  
Value Added ◽  
Areal Density ◽  
Vital Role ◽  
Sound Insulation ◽  
Insulation Material ◽  
Human Beings ◽  
Insulation Materials ◽  
Sustainable Products ◽  
Acoustic Insulation

One of the key issues of the 21st century is to reduce the rate of continuously increasing environmental pollution from waste generated by human beings. Use of recycled materials and environmentally friendly approaches to manufacturing can be a good way to deal with these challenges. Similarly, sound pollution has been increasing at an alarming rate due to industrialization and modernization. Use of acoustic insulation materials produced from recycled textile waste can play a vital role in reduction of sound pollution while simultaneously helping reduce municipal solid waste. The goal of this study was to evaluate the recycling of used apparels to produce commercially feasible sustainable products using nonwoven fabrication techniques with a biodegradable thermoplastic binder fiber for possible use as acoustic insulation panels. Recycled denim fibers were used with Sorona® or a PLA binder fiber to successfully produce sound insulation with good performance properties. Maximum transmission loss of about 24 dB and transmission coefficient close to zero at around 1000 Hz were observed. The data indicated that there is a direct correlation between loss of sound transmission with increase in thickness, areal density and decrease in air permeability. When compared with commercially available acoustic insulation material (gypsum board), these products had better insulation properties, indicating that recycled textile products can be used to produce such value-added materials, giving them another useful life before safely disposing in composting environments.

scholarly journals Kajian Eksperimental Koefisien Redaman Akustik Bahan Pelapis Plat Dek Kapal

2018 ◽  
Vol 3 (1) ◽  
pp. 41
Author(s):  
Wibowo Harso Nugroho ◽  
Nanang J.H. Purnomo ◽  
Hardi Zen ◽  
Andi Rahmadiansah
Keyword(s):  
Absorption Coefficient ◽  
High Frequency ◽  
Transmission Loss ◽  
Base Material ◽  
Sound Insulation ◽  
Insulation Material ◽  
Base Materials ◽  
Specimen Material ◽  
Ship Classification ◽  
Technical Assessment

With the increasingly strict requirements of the ship classification bureau for permissible noise limits to allow passengers and crew to be more comfortable and secure a technical assessment is required to address the characteristics of the noise. A noise beyond the standard allowed in the vessel can be a problem to the ship operators. This noise problem will greatly affects the crews' comfort and passengers. One method to reduce the noise on a ship is to use sound insulation. This paper describes the method for determining the absorption coefficient α and the transmission loss (TL) through an acoustic test of a concrete insulation in the laboratory. The test was conducted by using the method of impedance tube where a speciment response measured by a microphone. In general, the properties of this insulation material remains as the main base material which is concrete. it has been found that the transmission loss value (TL) is in the range of 10 - 50 dB whereas for the base material the concrete is around 22 - 49 dB but the absorption coefficient α of the specimen material is much higher than the material of the base material especially in high frequency, which ranges from 0.15 to 0.97, whereas for concrete base materials have absorbent coefficient α ranges from 0.01 to 0.02.

Preparation and Properties of Ultrafine Glass Wool by Centrifugal Blowing

2011 ◽  
Vol 148-149 ◽  
pp. 116-120
Author(s):  
Jin Lian Qiu ◽  
Zhao Feng Chen ◽  
Jie Ming Zhou ◽  
Jian Wang ◽  
Bin Bin Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Glass Fiber ◽  
Average Diameter ◽  
Glass Wool ◽  
Insulation Material ◽  
Insulation Materials ◽  
Materials Engineering ◽  
Acoustic Insulation ◽  
Fiber Reinforcements ◽  
Predominant Process

Due to extremely low thermal conductivity, high modulus, high toughness, light weight and non-combustible property, ultrafine glass wool can be widely used as glass fiber reinforcements in composites, thermal insulation materials, acoustic insulation materials, engineering materials, construction, infrastructure and environmental protection projects and so on. In particular, as a insulation material, glass wool exhibits unique advantages. The predominant process of glass wool is centrifugal blowing process. This paper describes a study of the relationship between the diameter of ultrafine glass fiber and thermal conductivity. The thermal conductivity of ultrafine glass wool decreases with the decrease of average diameter.

scholarly journals Assessment of the Physical, Mechanical and Acoustic Properties of Arundo donax L. Biomass in Low Pressure and Temperature Particleboards

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1361
Author(s):  
Maria Teresa Ferrandez-García ◽  
Antonio Ferrandez-Garcia ◽  
Teresa Garcia-Ortuño ◽  
Clara Eugenia Ferrandez-Garcia ◽  
Manuel Ferrandez-Villena
Keyword(s):  
Particle Size ◽  
Absorption Coefficient ◽  
Transmission Loss ◽  
Raw Material ◽  
Acoustic Properties ◽  
Giant Reed ◽  
Sound Insulation ◽  
New Mineral ◽  
Particle Sizes ◽  
Insulation Material

Traditionally, plant fibres have been used as a raw material for manufacturing construction materials; however, in the last century, they have been replaced by new mineral and synthetic materials with manufacturing processes that consume a large amount of energy. The objective of this study was to determine the mechanical, physical and acoustic properties of panels made from giant reed residues. The article focuses on evaluating the acoustic absorption of the boards for use in buildings. The materials used were reed particles and urea–formaldehyde was used as an adhesive. The panels were produced with three particle sizes and the influence that this parameter had on the properties of the board was evaluated. To determine the absorption coefficient, samples were tested at frequencies ranging from 50 to 6300 Hz. The results showed that the boards had a medium absorption coefficient for the low and high frequency range, with significant differences depending on the particle size. The boards with 2–4 mm particles could be classified as Class D sound absorbers, while boards with particle sizes of 0.25–1 mm showed the greatest sound transmission loss. Unlike the acoustic properties, the smaller the particle size used, the better the mechanical properties of the boards. The results showed that this may be an appropriate sound insulation material for commercial use.

Phononic crystal sandwich for broadband and low frequency acoustic insulation under diffuse field

2021 ◽  
Vol 263 (4) ◽  
pp. 2296-2303
Author(s):  
Natacha Aberkane-Gauthier ◽  
Miguel Moleròn ◽  
Damien Lecoq ◽  
Clément Lagarrigue ◽  
Charles Pézerat ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Core Layer ◽  
Field Measurements ◽  
Wide Frequency Range ◽  
Point Of View ◽  
Sound Insulation ◽  
Acoustic Insulation ◽  
Gap Opening

Light and thin structures exhibiting high sound insulation over a wide frequency range are a major industrial concern, especially in the transport and building sectors. Phononic crystals constitute promising solutions to solve this issue due to their particular dispersion properties. In this work, we build a system consisting of a well-known sandwich panel comprising a soft elastic core layer hosting periodically arranged rigid inclusions. Diffuse field measurements show a huge improvement of the Transmission Loss compared to the system without inclusions. In fact, for this kind of panel, the structured core enables Bragg band-gap opening for guided slow propagating waves leading to low frequency and broadband enhancement of the Transmission Loss. Using a 3cm-thick material we are able to improve the response from 300 Hz on (λ/38 in air). We then develop a finite elements model to achieve a precise description and understanding of the problem. We also propose a numerical tool to analyze the system's band-structures from a vibroacoustic point of view. It proves very useful for the further development of practical solutions.

Effect of Acoustic Pads' Different Dynamic Stiffness on the Reduction of Impact Sound Level

2014 ◽  
Vol 899 ◽  
pp. 491-494 ◽  
Author(s):  
Lenka Autratová ◽  
Petr Hlavsa
Keyword(s):  
Optimal Design ◽  
Transmission Loss ◽  
Dynamic Stiffness ◽  
Sound Level ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Acoustic Insulation ◽  
Impact Noise ◽  
Floor Structure ◽  
The Impact

Impact sound transmission loss is the ability of structure to absorb impact noise, which is formed by mechanical impulses (steps, falls). The impact noise is then spread to the elements connected to the floor structure, such as the ceiling and surrounding wall. Dynamic stiffness is one of the important parameters that affect the sound insulation of ceiling structures with floating floors. The article deals with the optimal design of acoustic insulation to the floor composition, combining different materials of various thicknesses with various characteristic properties.

scholarly journals ROBINA: Rotational Orbit-Based Inter-Node Adjustment for Acoustic Routing Path in the Internet of Underwater Things (IoUTs)

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5968
Author(s):  
Umar Draz ◽  
Sana Yasin ◽  
Tariq Ali ◽  
Amjad Ali ◽  
Zaid Bin Faheem ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Path Loss ◽  
Vital Role ◽  
Packet Transmission ◽  
The Internet ◽  
Human Beings ◽  
Multiple Reflections ◽  
Reliable Communication ◽  
Wide Range ◽  
End To End

The Internet of Underwater Things (IoUTs) enables various underwater objects be connected to accommodate a wide range of applications, such as oil and mineral exportations, disaster detection, and tracing tracking systems. As about 71% of our earth is covered by water and one-fourth of the population lives around this, the IoUT expects to play a vital role. It is imperative to pursue reliable communication in this vast domain, as human beings’ future depends on water activities and resources. Therefore, there is a urgent need for underwater communication to be reliable, end-to-end secure, and collision/void node-free, especially when the routing path is established between sender and sonobuoys. The foremost issue discussed in this area is its routing path, which has high security and bandwidth without simultaneous multiple reflections. Short communication range is also a problem (because of an absence of inter-node adjustment); the acoustic signals have short ranges and maximum-scaling factors that cause a delay in communication. Therefore, we proposed Rotational Orbit-Based Inter Node Adjustment (ROBINA) with variant Path-Adjustment (PA-ROBINA) and Path Loss (PL-ROBINA) for IoUTs to achive reliable communication between the sender and sonobuoys. Additionally, the mathematical-based path loss model was discussed to cover the PL-ROBINA strategy. Extensive simulations were conducted with various realistic parameters and the results were compared with state-of-the-art routing protocols. Extensive simulations proved that the proposed routing scheme outperformed different realistic parameters; for example, packet transmission 45% increased with an average end-to-end delay of only 0.3% respectively. Furthermore, the transmission loss and path loss (measured in dB) were 25 and 46 dB, respectively, compared with other algorithms, for example, EBER2 54%, WDFAD-BDR 54%, AEDG 49%, ASEGD 55%, AVH-AHH-VBF 54.5%, and TANVEER 39%, respectively. In addition, the individual parameters with ROBINA and TANVEER were also compared, in which ROBINA achieved a 98% packet transmission ratio compared with TANVEER, which was only 82%.

Sustainable Materials with Potential Application as Core Materials in Vacuum Insulations

2019 ◽  
Vol 887 ◽  
pp. 90-97
Author(s):  
Jiří Zach ◽  
Jitka Hroudová ◽  
Azra Korjenic
Keyword(s):  
Natural Fibers ◽  
Value Added ◽  
Mineral Wool ◽  
Expanded Polystyrene ◽  
The Czech Republic ◽  
Insulation Materials ◽  
Vacuum Insulation ◽  
Acoustic Insulation ◽  
Sustainable Materials ◽  
By Products

The trend of achieving sustainable development in the area of new, eco-friendly materials remains topical for many experts concerned with developing new materials applicable worldwide in civil engineering as well as elsewhere. Our research team has for many years been developing non-traditional materials that meet the current requirements. These materials are made with organic fibers – waste natural fibers produced by agriculture or waste industrial (locally produced) fibers. Their thermal and acoustic insulation properties are very close to those of conventional insulation materials (expanded polystyrene, extruded polystyrene, mineral wool, polyurethane foam), which are still finding broad use in the Czech Republic despite their harmful impact on the environment. The paper focuses on the various uses of several types of textile fibers (mainly by-products) in the development of modern insulation materials with a high value added. These materials bear several specific advantages over conventional insulations, which enable, among others, easier installation. Some of the newly developed insulations can also be used as core insulations in the manufacture of vacuum insulation panels (VIP).

scholarly journals Sound Transmission Loss Analysis on Building Materials

2018 ◽  
Vol 15 (4) ◽  
pp. 6001-6011 ◽  
Author(s):  
Tan Wei Hong ◽  
C. F. Sin
Keyword(s):  
Building Materials ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Expanded Polystyrene ◽  
Sound Insulation ◽  
Insulation Material ◽  
Sound Transmission Loss ◽  
Loss Analysis ◽  
Aerated Concrete ◽  
Selection Of

This study is mainly to determine the sound transmission loss (STL) performance of the four selected building materials using the impedance tube. The four building materials are; autoclaved aerated concrete (AAC), laminated glass, expanded polystyrene and rockwool. Transmission loss occurs when a sound goes through a partition or barrier. The specimens are prepared in two thicknesses, which are 10 mm and 20 mm. The STL of the specimen was determined and analysed. It is observed that the STL results for all the tested materials are having a similar trend, which is a thicker specimen gives higher STL. In general, all the materials deliver high STL at the frequency range of 3000 – 5500 Hz. In overall, the result shows that the expanded polystyrene scores the highest STL among the four building materials in this study. Six combinations of different material also were tested, and AAC & expanded polystyrene combination shows the highest STL value among the six combinations. The outcomes of this study can be referred by noise control engineer on the selection of the sound insulation material for the building noise insulation treatment.

Sound insulation of multi-layer glass-fiber felts: Role of morphology

2016 ◽  
Vol 87 (3) ◽  
pp. 261-269 ◽  
Author(s):  
Yong Yang ◽  
Binbin Li ◽  
Zhaofeng Chen ◽  
Ni Sui ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Transmission Loss ◽  
Resonance Effect ◽  
Sound Transmission ◽  
Areal Density ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Layer Structures ◽  
Air Layers

Glass-fiber felts have emerged as a popular material for noise reduction. This paper investigates the effect of various morphologies (micro-layer, macro-layer and air-layer) of glass-fiber felts on sound insulation. The sound transmission loss is measured by a Brüel & Kjár (B&K) impedance tube. The results show that the sound insulation of glass-fiber felts can be improved by increasing the number of macro-layers. The comparison between the macro- and micro-layer of glass-fiber felts on sound insulation is systematically carried out. Notably, the sound transmission loss of glass-fiber felts with similar areal density and thickness favors macro-layer structures over micro-layer structures. A simple model is established to explain this phenomenon. In addition, the sound transmission loss exhibits period fluctuations due to the presence of the air-layer between glass-fiber felts, which can be theoretically explained by the resonance effect. It is found that sound transmission loss can be improved by increasing the number of air-layers.

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