scholarly journals The Impact of Geometrical Structure of Domes on the Acoustic Performance within Mosques

2019 ◽  
Vol 13 (4) ◽  
Author(s):  
Omar Mustafa Alomari ◽  
FirasGandah ◽  
DemaKhraisat
Keyword(s):  
Geometrical Structure ◽  
Acoustic Performance ◽  
The Impact

scholarly journals Proposal of an Assessment Method of the Impact Sound Insulation of Lightweight Floors

Buildings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 13
Author(s):  
Łukasz Nowotny ◽  
Jacek Nurzyński
Keyword(s):  
Sound Pressure ◽  
Residential Buildings ◽  
Assessment Method ◽  
Sustainable Construction ◽  
Sound Insulation ◽  
Indicator Values ◽  
Floor Covering ◽  
Acoustic Performance ◽  
Quality Rating ◽  
The Impact

Lightweight floors are in line with a sustainable construction concept and have become increasingly popular in residential buildings. The acoustic performance of such floors plays a pivotal role in the overall building quality rating. There is, however, no clear and complete method to predict their impact sound insulation. A new approximation method and new acoustic indicators—equivalent weighted normalized impact sound pressure levels for lightweight floors—are proposed and outlined in this article. The prediction procedure and indicator values were initially validated on the basis of laboratory measurements taken for different lightweight floors with the same well-defined floor covering. These preliminary analyses and comparisons show that the proposed method is promising and should be fully developed on the basis of further research.

scholarly journals Lightweight ventilated façade: Acoustic performance in laboratory conditions, analysing the impact of controlled ventilation variations on airborne sound insulation

2020 ◽  
Vol 27 (4) ◽  
pp. 367-379
Author(s):  
Joan Lluis Zamora Mestre ◽  
Andrea Niampira
Keyword(s):  
Sound Insulation ◽  
Air Cavity ◽  
Acoustic Performance ◽  
Controlled Ventilation ◽  
Laboratory Conditions ◽  
Airborne Sound ◽  
Cavity Thickness ◽  
Ventilated Facade ◽  
The Impact ◽  
Real Building

The use of double-sheet enclosures with an intermediate non-ventilated air cavity guarantees a higher airborne sound insulation. The insulation advantages depend on air tightness and the placement of sound absorbing material in the air cavity. The lightweight ventilated façade is a system constructed by the addition of an external light cladding on a heavy single wall to establish an intermediate air cavity. This air cavity can be ventilated under controlled cooling effects, because of Sun’s radiation, and to reduce the risk of dampness caused by rainwater. Owing to this ventilation, acoustic insulation of the lightweight ventilated façade could be less effective. However, some authors indicate that air cavity moderate ventilation does not necessarily lead to a significant reduction in the airborne sound insulation. The authors previously verified this situation in a real building where the existing façade of masonry walls was transformed into a lightweight ventilated façade. The preliminary results indicate the acoustic benefits can be compatible with the hygrothermal benefits derived from controlled ventilation. This article presents the next step, the evaluation of the lightweight ventilated façade acoustic performance under laboratory conditions to revalidate the previous results and refining aspects as the air cavity thickness or the state of openings ventilation. The main results obtained indicate that the airborne sound insulation in laboratory is aligned with the previous results in a real building. Air cavity thickness from 110 to 175 mm and ventilation openings from 0% to 3.84% of the façade area does not lead to a significant reduction in the airborne sound insulation.

Impact sound transmission: experiments of control at the receiver room

2021 ◽  
Vol 263 (1) ◽  
pp. 5595-5599
Author(s):  
Davi Akkerman ◽  
Paola Weitbrecht ◽  
Mariana Shieko ◽  
Marcel Borin ◽  
Leonardo Jacomussi
Keyword(s):  
Social Housing ◽  
Sound Transmission ◽  
Field Tests ◽  
Sound Level ◽  
Sound Insulation ◽  
Total Cost ◽  
Acoustic Performance ◽  
The Impact ◽  
Insulation Performance

Considering Impact sound level requirements accomplishment in Brazil, floating floors are still considered as an inviable solution for building companies due to the implications in the total cost of building, mainly for social housing. Alternative and sometimes cheaper solutions are those undertaken in the receiver room. However, the lack of laboratory and field tests on the acoustic performance of this type of system is still a barrier for acoustic designing in Brazil. The aim of this paper is to study and validate different constructive solutions developed jointly with building companies for improving the impact sound insulation performance on the receiving room of new Brazilian housing constructions.

scholarly journals Carbon Capture Utilization for Biopolymer Foam Manufacture: Thermal, Mechanical and Acoustic Performance of PCL/PHBV CO2 Foams

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2559
Author(s):  
Kayode E. Oluwabunmi ◽  
Weihuan Zhao ◽  
Nandika D’Souza
Keyword(s):  
Carbon Capture ◽  
Mechanical Performance ◽  
Ecological Impact ◽  
Co2 Solubility ◽  
Scanning Calorimetry ◽  
Binary Blends ◽  
Acoustic Performance ◽  
Closed Cell ◽  
The Impact ◽  
Low Solubility

Biopolymer foams manufactured using CO2 brings a novel intersection for economic, environmental, and ecological impact. PHBV has a low solubility in CO2 while PCL has a high CO2 solubility. In this paper, PCL is used to blend into PBHV and unfoamed and foamed systems are examined. Foaming the binary blends at two depressurization stages with subcritical CO2 as the blowing agent, produced open-cell and closed-cell foams with varying cellular architecture at different PHBV concentrations. Differential Scanning Calorimetry results showed that a reduction in miscibility occurred as the concentration of PHBV increased in PCL matrix, while Scanning Electron Microscopy results showed the occurrence of bimodal cellular properties in some of the foam fractions, which improved their performance properties significantly. The results on the acoustic performance showed limited impact from foaming over the unfoamed blends but mechanical performance of foams showed a significant impact from PHBV presence in PCL. Thermal performance reflected that foams were affected by the blend thermal conductivity, but the impact was significantly higher in the foams than in the unfoamed blends.

scholarly journals Research on the impact of vibratory machining on the layer applied with the ESD technique

Mechanik ◽  
2018 ◽  
Vol 91 (11) ◽  
pp. 1029-1031
Author(s):  
Sławomir Spadło ◽  
Damian Bańkowski ◽  
Piotr Młynarczyk
Keyword(s):  
Chemical Composition ◽  
Carbon Steel ◽  
Surface Treatment ◽  
Geometrical Structure ◽  
Deposition Technique ◽  
Tungsten Electrode ◽  
Abrasive Treatment ◽  
Before And After ◽  
The Impact

The article presents the proposal of using abrasive treatment in vibrating containers for surface treatment applied with the Electro Spark Deposition technique. In tests on a carbon steel the layer was applied with a tungsten electrode. After the tungsten layers were applied, a vibro-abrasive treatment was carried out. Changes in the geometrical structure of the surface of the deposited layers before and after vibratory processing were investigated. In addition, the chemical composition and the thickness of the coatings were examined.

scholarly journals THE ANALYSIS OF ELEMENTS GEOMETRY POSITION IN THE IRANIAN GARDEN STRUCTURE

2018 ◽  
Vol 42 (2) ◽  
pp. 112-119
Author(s):  
Hanieh Mohammadi ◽  
Nima Valibeig
Keyword(s):  
Theoretical Basis ◽  
Geometrical Structure ◽  
Spatial Structures ◽  
Garden Design ◽  
Unique Pattern ◽  
Field Recordings ◽  
Library Studies ◽  
The Impact ◽  
Geometric Logic

Iranian garden has been known as a specific architecture in the whole world. Among all its special features, the geometrical structure of Iranian garden has always attracted the attention of architects and researchers. Nowadays, despite numerous studies on the Iranian gardens, the lack of geometrical studies and the extension of some old concepts have led to recognize the Iranian gardens based on a unique pattern in terms of geometry. This pattern has been known as an archetype and typifies the Iranian Garden Geometry as a quarter pattern. That it could not be a true hypothesis, because the impact of garden components on its structure has been neglected. Investigating geometric position of garden elements and their relationship with the general form of garden would provide more accurate theoretical basis for Iranian garden design. In addition, this approach could help experts to retrieve the ruined part of historical gardens. So far, extensive garden studies have been carried out more on the symbolic concepts, components introduction and typology according to times and locations. This article is the first attempt to study each common element’s geometry to realize how the spatial structures could be effective in the garden formation. This paper aims to recognize the architectural geometric logic of gardens based on library studies and field recordings.

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