scholarly journals Method for calculating the insulation of airborne sound by enclose from volumetric-block buildings

2021 ◽  
Vol 264 ◽  
pp. 02057
Author(s):  
Rakhmatulla Pirmatov ◽  
Jasur Rashidov ◽  
Khabibullo Pirmatov
Keyword(s):  
Human Health ◽  
Sleep Disturbances ◽  
Small Mass ◽  
Technical Condition ◽  
Design Stage ◽  
Design Solution ◽  
Sound Insulation ◽  
Sound Waves ◽  
Regulatory Requirements ◽  
Airborne Sound

This research paper provides a method for calculating airborne sound insulation by encloses from volumetric-block buildings. The choice of the most suitable construction solution for the technical condition of objects at the design stage for building elements should primarily provide insulation from sound and a safe mode inside buildings, in which protection conditions in the combination of energy efficiency and stability should be taken into account, as well as competent decisions and its impact on the construction process buildings. Numerous scientific studies show the negative effect of sound on human health by the occurrence of various diseases such as cognitive impairment of the fetus in reproductive people, sleep disturbances, tinnitus, irritation, and dysfunction of some human organs. Therefore, sound exposure should be considered a source of inconvenience and a source of harm to human health. Sound waves collide with the surfaces of enclosing structures, causing them to vibrate and transmit the negative effects of the air around them in adjoining rooms, in which, from the point of view of regulatory requirements, in many cases, it does not meet the requirements, since comfort also depends on the design and sound insulation of the volumetric-block buildings. Many of these problems are easily solved at the design stage by choosing the right design solution and calculating the soundproofing qualities of the enclosing structures. In particular, one of the main tasks at the design stage is the development of structural solutions for internal enclosing structures that have a relatively small mass that allows reducing the load on the supporting structures of the building and plummets the material consumption of construction. At the same time, it is necessary to ensure compliance with the regulatory requirements for the isolation of airborne sound of enclosing structures.

scholarly journals Sound insulation design of the thin partitions on the base of concentrated parameters model

Vestnik MGSU ◽  
2020 ◽  
pp. 353-367
Author(s):  
Ivan P. Saltykov
Keyword(s):  
Construction Materials ◽  
Momentum Conservation ◽  
Mass Action ◽  
Sound Insulation ◽  
Detailed Calculation ◽  
Sound Waves ◽  
Normative Documents ◽  
Airborne Sound ◽  
Calculation Technique ◽  
Velocity Transmission

Introduction. The theoretical and practical approach on the base of the discrete parameter's method to the acoustic insulation of the thin partitions by Candidate of Science, Prof. Zakharov A.V. is given in this issue. The method allowed to develop a logically conclusive and consistent physical airborne sound insulation model for one-layered massive and light partitions either. This issue concentrates on providing of the engineer calculation technique of the sound insula-tion for the thin partitions and, also, on comparison of the technique's results with the computations by the current normative documents. Materials and methods. The application of the same “Mass Action Law's” formula both for the normal and the oblique noise wave's incidence on the sound isolating plate, regardless the sound waves angles, is mathematically and physically approved. The essence of the concentrated parameters, such as concentrated and reduced material's mass, is revealed. The equations of momentum conservation law and kinetic energy conservation are used to obtain the coefficient of the oscillation velocity transmission. The formulas for airborne sound insulation at the diapasons before and after the sound wave's coincidence frequency are written. Results. The damping air property's influence on the thin partition's sound insulation is considered, and it's formulas are represented. The formulas for taking into account the reduction of sound insulation at the resonances in sound protective slab or in a partition are also given. The general equation for the thin partition's sound insulation by the method of localized (discrete) parameters are derived. The example of detailed calculation of the sound isolation of the thin asbestos-cement partition is demonstrated. The comparison between the medial three octave deviations of the sound isolation values and the experimental results in case of the SP (Russian normative document) method and in case of the introduced author's method for the different construction materials is represented. Conclusions. The proposedsound insulation calculation method for the thin light partitions, which is based on the concentrated parameters model, gives very close to experiments results. So, it enables to find the insulation figures across the entire standard frequency range, according to the initial physical and technical materials' and constructions' features.

A Sound Insulation Prediction Model for Floor Structures in Wooden Buildings Using Neural Networks Approach

2021 ◽  
Vol 263 (2) ◽  
pp. 4166-4176
Author(s):  
Mohamad Bader Eddin ◽  
Sylvain Menard ◽  
Delphine Bard ◽  
Jean-Luc Kouyoumji ◽  
Nikolas-Georgios Vardaxis
Keyword(s):  
Neural Networks ◽  
Prediction Model ◽  
Large Error ◽  
Design Stage ◽  
Sound Insulation ◽  
Low Frequencies ◽  
Airborne Sound ◽  
Initial Stage ◽  
Building Acoustics ◽  
The Impact

Recently, machine learning and its applications have gained a large attraction in different fields. Accurate predictions in building acoustics is vital especially in the design stage. This paper presents a sound insulation prediction model based on Artificial Neural Networks (ANNs) to estimate acoustic performance for airborne and impact sound insulation of floor structures. At an initial stage, the prediction model was developed and tested for a small amount of data, specifically 67 measurement curves in one third octave bands. The results indicate that the model can predict the weighted airborne sound insulation for various floors with an error around 1 dB, while the accuracy decreases for the impact sound especially for complex floor configurations due to large error deviations in high frequency bands between the real and estimated values. The model also shows a very good accuracy in predicting the airborne and impact sound insulation curves in the low frequencies, which are of higher interest usually in building acoustics. Keywords: building acoustics, airborne sound, impact sound, prediction model, neural networks

scholarly journals Impact of Window to Wall Ratio on Energy Loads in Hot Regions: A Study of Building Energy Performance

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1080
Author(s):  
Mamdooh Alwetaishi ◽  
Omrane Benjeddou
Keyword(s):  
Saudi Arabia ◽  
Building Materials ◽  
Building Design ◽  
Building Energy ◽  
Energy Performance ◽  
Design Stage ◽  
Design Solution ◽  
Building Energy Efficiency ◽  
Climatic Regions ◽  
Heating And Cooling

The concern regarding local responsive building design has gained more attention globally as of late. This is due to the issue of the rapid increase in energy consumption in buildings for the purpose of heating and cooling. This has become a crucial issue in educational buildings and especially in schools. The major issue in school buildings in Saudi Arabia is that they are a form of prototype school building design (PSBD). As a result, if there is any concern in the design stage and in relation to the selection of building materials, this will spread throughout the region. In addition to that, the design is repeated regardless of the climate variation within the kingdom of Saudi Arabia. This research will focus on the influence of the window to wall ratio on the energy load in various orientations and different climatic regions. The research will use the energy computer tool TAS Environmental Design Solution Limited (EDSL) to calculate the energy load as well as solar gain. During the visit to the sample schools, a globe thermometer will be used to monitor the globe temperature in the classrooms. This research introduces a framework to assist architects and engineers in selecting the proper window to wall ratio (WWR) in each direction within the same building based on adequate natural light with a minimum reliance on energy load. For ultimate WWR for energy performance and daylight, the WWR should range from 20% to 30%, depending on orientation, in order to provide the optimal daylight factor combined with building energy efficiency. This ratio can be slightly greater in higher altitude locations.

scholarly journals Analysis of vibrodiagnostics methods in the technical state study of designed multimedia mobile scenes

2019 ◽  
Vol 302 ◽  
pp. 01011
Author(s):  
Marcin Łukasiewicz ◽  
Michał Liss ◽  
Natalia Dluhunovych
Keyword(s):  
Modal Analysis ◽  
Diagnostic Tests ◽  
Research Process ◽  
Technical Condition ◽  
Technical State ◽  
Normal Operation ◽  
Design Stage ◽  
Analysis Methods ◽  
State Study ◽  
Diagnostic Research

The paper presents the possibilities of using vibroacoustic methods in the study of the technical condition of designed multimedia mobile scenes. In particular, the possibility of implementing modal analysis methods in modelling and diagnostic research process has been presented. The use of virtual methods enables diagnostic tests both at the design stage and at the stage of normal operation, whereas modal methods help to explain the nature of the work of the element under investigation.

scholarly journals Assessment of the airborne sound insulation from mobility vibration measurements; a hybrid experimental numerical approach

2018 ◽  
Vol 432 ◽  
pp. 680-698 ◽  
Author(s):  
N.B. Roozen ◽  
Q. Leclère ◽  
D. Urbán ◽  
T. Méndez Echenagucia ◽  
P. Block ◽  
...  
Keyword(s):  
Numerical Approach ◽  
Sound Insulation ◽  
Vibration Measurements ◽  
Airborne Sound

scholarly journals Non-Wovens as Sound Reducers

2018 ◽  
Vol 55 (2) ◽  
pp. 64-76
Author(s):  
D. Belakova ◽  
A. Seile ◽  
S. Kukle ◽  
T. Plamus
Keyword(s):  
Absorption Coefficient ◽  
Surface Density ◽  
Sound Absorption ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Insulation ◽  
Material Structure ◽  
Sound Transmission Loss ◽  
Sound Waves ◽  
Frequency Range

Abstract Within the present study, the effect of hemp (40 wt%) and polyactide (60 wt%), non-woven surface density, thickness and number of fibre web layers on the sound absorption coefficient and the sound transmission loss in the frequency range from 50 to 5000 Hz is analysed. The sound insulation properties of the experimental samples have been determined, compared to the ones in practical use, and the possible use of material has been defined. Non-woven materials are ideally suited for use in acoustic insulation products because the arrangement of fibres produces a porous material structure, which leads to a greater interaction between sound waves and fibre structure. Of all the tested samples (A, B and D), the non-woven variant B exceeded the surface density of sample A by 1.22 times and 1.15 times that of sample D. By placing non-wovens one above the other in 2 layers, it is possible to increase the absorption coefficient of the material, which depending on the frequency corresponds to C, D, and E sound absorption classes. Sample A demonstrates the best sound absorption of all the three samples in the frequency range from 250 to 2000 Hz. In the test frequency range from 50 to 5000 Hz, the sound transmission loss varies from 0.76 (Sample D at 63 Hz) to 3.90 (Sample B at 5000 Hz).

scholarly journals An epidemiological study on alcohol consumption and knowledge of its harmful effects on human health among rural adult population of adopted villages covered under field practice area of a private medical college in Udaipur, Rajasthan

2018 ◽  
Vol 5 (11) ◽  
pp. 4874
Author(s):  
Rupesh Kumar ◽  
Rakhi Luthra ◽  
Maitri R. Hathi
Keyword(s):  
Alcohol Consumption ◽  
Adverse Effects ◽  
Human Health ◽  
Sleep Disturbances ◽  
Peer Group ◽  
Adult Population ◽  
Public Health Issue ◽  
Medical College ◽  
Field Practice ◽  
Harmful Effects

Background: Consumption of alcohol among adults is a serious public health issue worldwide. However the knowledge of adverse effects of alcohol consumption on human health is very negligibly less in small towns and villages of India. Present study was conducted to determine the extent of alcohol intake and the knowledge of its adverse effects on human health among adult population.Methods: A cross-sectional study was carried out on randomly selected 400 rural adults from a field practice area of private medical college, Udaipur.Results: Prevalence of alcohol consumption was found to be (47.25%) with (49.36%) males and (39%) females. More than half of drinkers (55.9%) were belonging to 30-39 age group. Country liquor was preferred by (68.88%) and only (17.77%) consume English (IMFL). (56%) of alcohol consumers were drinking alcohol for more than a year. Most of the drinkers (49%) were induced by their friends, (24%) were induced/influenced by their parents. (42.25%) drinkers had knowledge of harmfulness of alcohol drinking; however the awareness per se did not have statistically significant effect for alcohol consumption. Results showed that the knowledge of excessive intake of alcohol can cause harmful effects on human health like Infertility to woman, irregular menstrual cycle, cancer were statistically significant (p<0.05) gender wise, while effects like depression, sleep disturbances, alcoholic hepatises, liver disease, malnutrition were statistically not significant (p>0.05).Conclusions: There is a need to enhance awareness on adverse effects of alcohol and at least bring down consumption level among heavy drinkers through peer group/family/community involvement.

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