Attenuation of Noise using Barrier in the form of Enclosure (original) (raw)
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Attenuation of Noise Barrier in the Form of Enclosures
The installation of sound barriers is feasible enough to cause a significant decrease in noise pollution on roads. This study analyzes how the noise barriers affect the sound intensity level on roads. Noise level generated by a traffic flowing across open stream is compared to that of roads provided with sound barrier. Based on the field measurements an in-depth discussion is carried out to analyze the effectiveness of installing the barriers. The main objective of this paper is to predict the sound attenuation after the installation of the sound barrier on the road side. The priority of this project is to determine whether the installation of sound barriers is feasible enough to cause a distinct decrease in noise level on the roads.
COMPARISON OF EFFECTIVE NOISE BARRIERS IN TERMS OF ATTENUATION OF NOISE POLLUTION
Attenuating the noise is an ideal solution for the prevention of its pollution rather than its control. The process of attenuation can be achieved by providing noise barriers when it is unbearably louder. However, the provision of the barrier is cost effective as well as beneficial to human beings in the longer time. An analysis is created to achieve a potential noise barrier by constructing two noise barriers on a highway. The cost of a barrier can be described with known or quantifiable parameters such as barrier height, thickness, materials, initial costs, maintenance costs, replacement costs, etc. The benefits associated with a solution are defined by computable parameters such as sound absorption, sound reduction, insertion loss, and even intangible parameters such as its visual impact and environmental impact. In this study, the barriers used are of thatched leaves and concrete wall of specific size, and the reduction of traffic noise is being examined in terms of performance and construction cost and the suitability of each barrier is defined.
A case study on acoustic performance and construction costs of noise barriers
Scientific research and essays
In the study, the barriers used for reducing traffic noise are being examined in means of performance and construction cost. First a noise prediction is made in the sample highway under certain traffic conditions in order to determine the noise barrier requirement and the results are confirmed by measurement. According to the noise prediction equations used in Turkey, Germany and Canada, the effects of heavy vehicle ratio, average traffic flow speed and hourly total vehicle quantity change on noise level and barrier requirement are examined, so assessment can be made for highways having different traffic specifications than the sample highway. In the continuation of the study, the working principle of noise barriers and effects of barrier position and height on reducing noise are researched in order to determine the construction costs of barriers in Turkey and Canada at different heights and made from different materials.
Science of The Total Environment, 2008
The public, increasingly well-informed about the problem of excessive noise, is taking actions for the development of new transport infrastructure projects and improvement of existing infrastructure. In addition, many countries have implemented mandatory Environmental Impact Assessment procedures. As a result, the construction of sound barriers has become a common measure, which can be used by an agency to mitigate potentially significant noise impacts. A sound barrier, eventually, will become part of the surrounding landscape and could be a cause of impact for ecosystems, the road users and those who live alongside the road. Basically, this article discusses these potential effects in the context of environmental assessment procedures. In addition, results of a pilot survey conducted at a residential area affected by the construction of a barrier are presented.
The Decrease of Noise with Acoustics Barriers
sra.ro
In this paper is presented the effect of one barrier of length infinite, situated along the speedway, having effect of acoustics protection over a populated area situated behind it. The barrier doesn't cover up an area of acoustic shadow, due to sound diffraction over the superior edge. It's made a parallel between two choice variants of acoustics barriers using the sound damping calculation, from behind of barrier.
Influence of traffic noise emission spectra on the design of barriers
Noise Control Engineering Journal, 2007
Acoustical barriers are widely used and the methods to estimate the noise attenuation they produce are well established. Although data for noise spectra for different conditions of road traffic are available, the interim method recommended in the European Union considers only one kind of spectrum. This has important implications in the dimensions of the barriers used for noise attenuation, generally leading to over sizing with the corresponding economical costs. The intent of this paper is to show the practical importance of the spectra used when determining dimensions of acoustical barriers and the level of uncertainty that may occur when only one kind of spectrum is considered.
The Effect of Design Efficiency of the Wall Barrier ( Screen ) On Traffic Noise Attenuation
2016
This research evaluates the sound performance of screen models exposed to linear finite-length sound source as a mean of traffic noise attenuation to prevent sound waves penetration through the wall barrier (screen) gaps and sound diffraction around its edges which affect the sound shadow area in front of the building behind the screen which act as a noise barrier. A theoretical background of the acoustical performance of screens that act as a noise barrier between the source (vehicles) and the receiver environment is presented. Mathematical models are used to analyze the proposed case studies, and to test the effect of different type of screen design on geometrical spreading of direct and diffracted sound waves around the screen reaching the front facade of buildings facing traffic noise. The objective of the research is to study 1. The effect of screen design and their geometrical configuration on noise penetration to the acoustical shadow zone behind the screen in aligned buildin...
Parameters Affecting the Outdoor Noise Barriers Effectiveness - Simulation with Soundplan
2020
Abstract: The article presents design principles of sound barriers and an assessment of the acoustic parameters that can influence their efficiency. It was studied how the acoustic absorption coefficients of the noise barriers coupled with the noise emission characteristics of the noise sources influence the values of the noise level at the receiver. For this, with the help of the SoundPlan software package, it has been shown that for noise sources with the same acoustic power values and sound barriers of the same size, the values of the sound pressure level at the receiver location differ significantly depending on the spectral characteristics of the acoustic emission and by the sound absorption coefficients of the sound barriers. It has been shown that the sound absorption evaluation index - DLα - of sound barriers does not always reflect the actual performance of the sound barriers, there being situations where, for industrial noise sources, a sound barrier having DLα = 8 dB will...
ICSV 14 Cairns • Australia 9-12 July , 2007 ACOUSTIC PROPERTIES OF SOUND BARRIERS
2007
The purpose of this study was to optimize the acoustic properties of sound barriers for traffic noise applications. For a correct assessment of the noise produced by road vehicles, it is necessary to know every detail about the noise source. The main difficulty in the prediction of road traffic noise levels is the great variation in source conditions. First of all, the road vehicle type may vary from scooters and mopeds to various types of passenger cars to various types of trucks. Secondly, the characteristics of the road surface are of great influence on the tyre/road noise production. Finally, the noise produced by a single vehicle on a specific road surface is dependent on driving behavior and meteorological conditions.