scholarly journals Airborne sound insulation of single-leaf partitions under hygric load

2021 ◽  
Vol 2069 (1) ◽  
pp. 012161
Author(s):  
M Hermes
Keyword(s):  
Building Material ◽  
Building Materials ◽  
Incidence Angle ◽  
Characteristic Impedance ◽  
Mass Effect ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Airborne Sound ◽  
Single Leaf ◽  
Calculation Results

Abstract In buildings of all types the use of single-leaf partitions are recommended, not least for reasons of cost efficiency and possible resource optimisation. In addition to the familiar building physics topics they play also a particularly important role in noise protection. Numerous factors influence the acoustic properties of single-leaf, plate-shaped and dry partitions. These include the mass, the bending stiffness, the position of the critical frequency and the total loss factor of the partition as well as the stimulating frequency of the airborne sound, the sound incidence angle or the characteristic impedance of the air. Each mineral wall-building material has its own product-specific pore structure. In the usual calculation of the airborne sound insulation of single-leaf, airtight and dry partitions, this has so far not been taken into account. It is precisely in these building material pores that a hygrothermal, continuous adjustment of the moisture content takes place in addition to the production-related water quantities. This changes the mass of the building component and thus the airborne sound insulation of the wall. In addition to this well-known mass effect, a further mechanism, which has not yet been considered, increases airborne sound insulation: the smaller the pore sizes in the building material, the greater the mechanical forces caused by stored pore water. The existing equations for airborne sound insulation do not take these effective forces into account and must therefore be extended. The wall building material is considered as a porous medium with solid and fluid components. The new calculation approach allows the calculation of the airborne sound reduction index for single-leaf partitions under hygric load for saturated and partially saturated moisture conditions with high accuracy. The calculation results provide valuable information for the planning and product development of new building materials.

Empirical study on the correlation between measurement methods under diffuse and direct sound field conditions for determining sound absorption and airborne sound insulation properties of noise barriers

2021 ◽  
Vol 263 (3) ◽  
pp. 3350-3361
Author(s):  
Andreas Fuchs ◽  
Reinhard Wehr ◽  
Marco Conter
Keyword(s):  
Empirical Study ◽  
Sound Absorption ◽  
Sound Field ◽  
Research Programme ◽  
Measurement Methods ◽  
Field Conditions ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Noise Barriers ◽  
Airborne Sound

In the frame of the SOPRANOISE project (funded by CEDR in the Transnational Road Research Programme 2018) the database of the European noise barrier market developed during the QUIESST project was updated with newly acquired data. This database gives the opportunity for an empirical study on the correlation between the different measurement methods for the acoustic properties of noise barriers (according to the EN 1793 series) to further investigate the interrelationships between these methods by using single-number ratings and third-octave band data. First a correlation of the measurement methods for sound absorption under diffuse field conditions (EN 1793-1) and sound reflection under direct sound field conditions (EN 1793-5) is presented. Secondly, a correlation of the measurement methods for airborne sound insulation under diffuse field conditions (EN 1793-2) and airborne sound insulation under direct sound field conditions (EN 1793-6) is shown. While for airborne sound insulation a distinct correlation is found due to the wide data range, for sound absorption no robust correlation can be found.

scholarly journals Elaboration and Characterization of Composite Materials Based on Plaster-Gypsum and Mineral Additives for Energy Efficiency in Buildings

Proceedings ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 22
Author(s):  
Bouzit ◽  
Taha
Keyword(s):  
Thermal Conductivity ◽  
Energy Efficiency ◽  
Composite Materials ◽  
Building Material ◽  
Building Materials ◽  
Building Envelope ◽  
Acoustic Properties ◽  
Building Sector ◽  
Acoustic Performance ◽  
Mineral Additives

The building sector is one of the largest energy consumers in the world, prompting scientific researchers to find solutions to the problem. The choice of appropriate building materials presents a considerable challenge for improving the thermal comfort of buildings. In this scenario, plaster-based insulating materials have more and more interests and new applications, such as insulating coatings developing the building envelope. Several works are being done to improve energy efficiency in the building sector through the study of building materials with insulation quality and energy savings. In this work, new composite materials, plaster-gypsum with mineral additives are produced and evaluated experimentally to obtain low-cost materials with improved thermo-physical and acoustic properties. The resulting composites are intended for use in building walls. Plaster-gypsum is presented as a high-performance thermal material, and mineral additives are of great importance because of their nature and are environmentally friendly. Measurements of thermal properties are carried and measurements of acoustic properties. The results show that it is possible to improve the thermal and acoustic performance of building material by using plaster as a base material and by incorporating thermal insulators. The thermal conductivity of plaster alone is greater than that of plaster with mineral additives, offer interesting thermal and acoustic performance. By varying the additives, the thermal conductivity changes. Finally, comparing the results, plaster with mineral additives is considered the best building material in this study

Prediction on Coincidence Effect of Sound Insulation of a Wall

2011 ◽  
Vol 99-100 ◽  
pp. 354-357
Author(s):  
Xian Feng Huang ◽  
Jun Liu ◽  
Yan Yang
Keyword(s):  
Building Materials ◽  
Energy Analysis ◽  
Sound Insulation ◽  
Light Weight ◽  
Statistical Energy Analysis ◽  
Frequency Range ◽  
Single Leaf ◽  
Comparison Results ◽  
Coincidence Effect ◽  
Sound Environment

Coincidence effect which occurs in a certain frequency range will impairs the sound insulation of walls. For the purpose to predict the phenomenon of coincidence effect that is unlikely predicted theoretically by the mass law, the Statistical Energy Analysis (SEA) theory are adopted in studying coincidence effect of sound insulation of the light weight single-leaf wall. The comparison among predicted by SEA, by mass law and measured was performed. Therefore, the comparison results show that sound insulation prediction by SEA is more precise and agrees with the measured date. Moreover, the coincidence effect and its effect on sound insulation were predicted by SEA. Eventually, it is likely to select appropriate building materials and configuration to achieve a better sound environment theoretically.

Influence of the Installation Lines to the Acoustic Properties of Dividing Wall

2015 ◽  
Vol 752-753 ◽  
pp. 728-732
Author(s):  
Jiří Winkler ◽  
Darja Kubeckova ◽  
Lucie Kucerova ◽  
Nada Zdrazilova
Keyword(s):  
Structural Damage ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Structural Systems ◽  
Technical Equipment ◽  
Noise Propagation ◽  
Airborne Sound ◽  
Experimental Structure ◽  
Hollow Bricks

This article presents the results of long-term research of airborne sound insulation of a dividing wall. Specifically it shows how strong effect on the acoustic properties of the dividing walls has the line installation of technical equipment of building. The experimental structure was built from shaped hollow bricks where the influence of structural damage is in terms of the noise propagation essential. This type of structure was selected because it is one of the most commonly used structural systems and the acoustic properties are still neglected aspect.

Prediction on Coupling Loss Factors of Building Members

2015 ◽  
Vol 744-746 ◽  
pp. 1589-1592
Author(s):  
Jun Xin Lan ◽  
Xian Feng Huang ◽  
Shang You Wei ◽  
Zhi Xiang Zhuang
Keyword(s):  
Energy Loss ◽  
Building Material ◽  
Loss Factor ◽  
Building Materials ◽  
Sound Insulation ◽  
Coupling Loss ◽  
High Insulation ◽  
The Relationship ◽  
Insulation Performance ◽  
Coupling Loss Factor

Coupling Loss Factor (CLF) is a parameter describing building sound loss, which can be stand for energy loss in the process of crossing the structure. A low value of CLF refers to the high insulation performance of building member. Therefore, reducing the coupling loss is a favorable way to improve the sound insulation. For the purpose of exploring the relationship between the properties of building materials and CLF, the commonly used building materials are selected to analyze. It is indicated that the properties of building material have obvious effects on the CLF. As the consequence, some predictions and analysis are carried out in this paper.

Air-Tightness and Acoustic Properties of SuperAdobe System

2014 ◽  
Vol 899 ◽  
pp. 365-368 ◽  
Author(s):  
Jiří Teslík ◽  
Naďa Zdražilová ◽  
Martina Vodičková
Keyword(s):  
Acoustic Properties ◽  
Sound Insulation ◽  
Acoustic Parameters ◽  
Airborne Sound ◽  
Earthen Structures ◽  
Air Tightness

Paper presents results of measuring of airtightness and acoustic properties of clay house. This clay house was built as a "SuperAdobe house" from the bags filled with clay. Construction of the clay house is a cupola. Objective of the measurement was to evaluate the quality of peripheral construction in terms of airtightness. We also wanted to verify the acoustic parameters of earthen structures and determine the value of airborne sound insulation.

Analysis of Predictive Calculation Methods of Airborne Sound Insulation

2016 ◽  
Vol 835 ◽  
pp. 573-578 ◽  
Author(s):  
Naďa Zdražilová ◽  
Denisa Donová ◽  
Iveta Skotnicova
Keyword(s):  
Acoustic Properties ◽  
Sound Insulation ◽  
Building Structures ◽  
Calculation Methods ◽  
Airborne Sound ◽  
Mutual Comparison ◽  
Sound Reduction ◽  
Reduction Index

Acoustic properties of building structures are currently very actual theme with regard to the development of new building and insulating materials, while the methods for estimating the airborne sound reduction index evolve mainly from the second half of the 20th century. For mutual comparison of selected prediction methods and for determination of their suitability it has been provided a calculation of weighted sound reduction index RW [dB] from the input parameters of materials identified by laboratory measurements, calculation of weighted apparent sound reduction index R ́W [dB] and these values were compared with in-situ measurements. The aim of this paper is to determine the most appropriate method to calculate RW [dB] and R ́W [dB] values of lightweight building constructions with regard to their practical applicability, accuracy of estimation and complexity of the calculations.

Influence of Electrical Power Lines on Acoustic Properties of Partition Constructions

2014 ◽  
Vol 1020 ◽  
pp. 323-328
Author(s):  
Jiří Winkler ◽  
Darja Kubečková ◽  
Naďa Zdražilová ◽  
Pavel Oravec
Keyword(s):  
Surface Density ◽  
Electrical Power ◽  
Acoustic Properties ◽  
Power Lines ◽  
Sound Insulation ◽  
Damping Properties ◽  
Partition Wall ◽  
Airborne Sound ◽  
Wooden House ◽  
Acoustic Resistance

This paper deals with the issue of airborne sound insulation of partition wall in wooden house. Wood and wood-based constructions are very specific in terms of acoustic due to the low surface density of their elements. Built-in installations and side-ways of spread of noise negatively affect damping properties of the wall. This article contains also a proposal of structural measures to ensure better acoustic resistance of the separating elements.

scholarly journals Sound-Absorbing Acoustic Concretes: A Review

2021 ◽  
Vol 13 (19) ◽  
pp. 10712 ◽  
Author(s):  
Mugahed Amran ◽  
Roman Fediuk ◽  
Gunasekaran Murali ◽  
Nikolai Vatin ◽  
Amin Al-Fakih
Keyword(s):  
Building Materials ◽  
Measurement Techniques ◽  
Construction Materials ◽  
Residential Building ◽  
Well Being ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Absorption Properties ◽  
Acoustic Performance ◽  
Cellular Concrete

Noise is continuously treated as an annoyance to humans and indeed commotion contamination shows up within the environment, causing inconvenience. This is likewise interesting to the engineering tactic that inclines to develop this noise proliferation. The basics of the sound-retaining proliferation, sound-absorbing properties, and its variables were rarely considered by previous researchers. Thus, the acoustic performance and sound insulation of constructions have gained significance over the last five decades due to the trend for accommodating inner-city flat and multi-story residential building condominiums. Due to this dilemma, the proliferation of high-driven entertaining schemes has engaged extraordinary demands on building for its acoustic performance. Yet, construction industries worldwide have started to mainly use sound-absorbing concrete to reduce the frequency of sounds in opened-and-closed areas and increase sound insulation. As reported, the concrete acoustic properties generally rely on its density, exhibiting that the lighter ones, such as cellular concrete, will absorb more sound than high-density concretes. However, this paper has an objective to afford a wide-ranging review of sound-absorbing acoustic concretes, including the measurement techniques and insulation characteristics of building materials and the sound absorption properties of construction materials. It is also intended to extensively review to provide insights into the possible use of a typical sound-absorbing acoustic concrete in today’s building industry to enhance housing occupants’ efficiency, comfort, well-being, and safety.

scholarly journals A Novel Acoustic Sandwich Panel Based on Sheep Wool

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 148
Author(s):  
Daniela-Roxana Tămaş-Gavrea ◽  
Tünde-Orsolya Dénes ◽  
Raluca Iştoan ◽  
Ancuţa Elena Tiuc ◽  
Daniela Lucia Manea ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Sandwich Panel ◽  
Bending Strength ◽  
Hydrated Lime ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Partition Wall ◽  
Airborne Sound ◽  
Composite Face ◽  
Sheep Wool

The aim of this paper is to propose a novel sandwich panel, which would be suitable for sound absorption and airborne sound insulation, used as applied cladding or independent lightweight partition wall. As far as the authors are concerned, this is the first sheep wool-based sandwich panel using only natural materials. The structure was prepared using hydrated lime-based composite face sheets and a sheep wool-based core. Several parameters of the sandwich panel were determined, including sound absorption coefficient, airborne sound insulation, thermal conductivity, thermal resistance, compressive strength, and bending strength, respectively. The results indicate that the maximum sound absorption value of 0.903 was obtained at the frequency of 524 Hz in the case of the unperforated sample, 0.822 at 536 Hz in the case of the sample with 10% perforations, 0.780 at 3036 Hz in the case of the sample with 20% perforations, and 0.853 at 3200 Hz in the case of the sample with 30% perforations. The registered airborne sound insulation index of the panel was 38 dB. Based on the obtained data, it can be concluded that the studied panel recorded comparable values with other synthetic noise control solutions, which are suitable as applied cladding or an independent lightweight partition wall, with good acoustic properties.

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