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 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.

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.

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.

scholarly journals Determination of the Airborne Sound Insulation of a Straw Bale Partition Wall

2017 ◽  
Vol 13 (1) ◽  
pp. 20-29 ◽  
Author(s):  
Jiří Teslík ◽  
Radek Fabian ◽  
Barbora Hrubá
Keyword(s):  
Sound Insulation ◽  
Partition Wall ◽  
Airborne Sound ◽  
University Of Technology ◽  
Wide Range ◽  
Scientific Project ◽  
Sound Reduction ◽  
Straw Bale ◽  
Reduction Index

AbstractThis paper describes the results of a scientific project focused on determining of the Airborne Sound Insulation of a peripheral non-load bearing wall made of straw bales expressed by Weighted Sound Reduction Index. Weighted Sound Reduction Index was determined by measuring in the certified acoustic laboratory at the Faculty of Mechanical Engineering at Brno University of Technology. The measured structure of the straw wall was modified in combinations with various materials, so the results include a wide range of possible compositions of the wall. The key modification was application of plaster on both sides of the straw bale wall. This construction as is frequently done in actual straw houses. The additional measurements were performed on the straw wall with several variants of additional wall of slab materials. The airborne sound insulation value has been also measured in separate stages of the construction. Thus it is possible to compare and determinate the effect of the single layers on the airborne sound insulation.

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.

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.

scholarly journals Experiments and FE Analyses on Airborne Sound Properties of Composite Structural Insulated Panels

2015 ◽  
Vol 39 (3) ◽  
pp. 351-364 ◽  
Author(s):  
Adam Wawrzynowicz ◽  
Marek Krzaczek ◽  
Jacek Tejchman
Keyword(s):  
Expanded Polystyrene ◽  
Acoustic Properties ◽  
Sound Insulation ◽  
Fem Model ◽  
Airborne Sound ◽  
Structural Insulated Panels ◽  
Numerical Finite Element ◽  
Reverberation Chambers ◽  
Sound Reduction ◽  
2D And 3D

Abstract Airborne acoustic properties of composite structural insulated panels CSIPs composed of fibre-magnesium-cement facesheets and expanded polystyrene core were studied. The sound reduction ratings were measured experimentally in an acoustic test laboratory composed of two reverberation chambers. The numerical finite element (FEM) model of an acoustic laboratory available in ABAQUS was used and verified with experimental results. Steady-state and transient FE analyses were performed. The 2D and 3D modelling FE results were compared. Different panel core modifications were numerically tested in order to improve the airborne sound insulation of CSIPs.

scholarly journals Factors Affecting Acoustic Properties of Natural-Fiber-Based Materials and Composites: A Review

Textiles ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 55-85
Author(s):  
Tufail Hassan ◽  
Hafsa Jamshaid ◽  
Rajesh Mishra ◽  
Muhammad Qamar Khan ◽  
Michal Petru ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Fiber Type ◽  
Alkali Treatment ◽  
Acoustic Properties ◽  
Synthetic Fiber ◽  
Sound Insulation ◽  
Factors Affecting ◽  
Wide Range

Recently, very rapid growth has been observed in the innovations and use of natural-fiber-based materials and composites for acoustic applications due to their environmentally friendly nature, low cost, and good acoustic absorption capability. However, there are still challenges for researchers to improve the mechanical and acoustic properties of natural fiber composites. In contrast, synthetic fiber-based composites have good mechanical properties and can be used in a wide range of structural and automotive applications. This review aims to provide a short overview of the different factors that affect the acoustic properties of natural-fiber-based materials and composites. The various factors that influence acoustic performance are fiber type, fineness, length, orientation, density, volume fraction in the composite, thickness, level of compression, and design. The details of various factors affecting the acoustic behavior of the fiber-based composites are described. Natural-fiber-based composites exhibit relatively good sound absorption capability due to their porous structure. Surface modification by alkali treatment can enhance the sound absorption performance. These materials can be used in buildings and interiors for efficient sound insulation.

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