scholarly journals Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 614
Author(s):  
Hsiao Mun Lee ◽  
Andi Haris ◽  
Kian Meng Lim ◽  
Jinlong Xie ◽  
Heow Pueh Lee
Keyword(s):  
White Noise ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Experimental Results ◽  
Frequency Range ◽  
Noise Mitigation ◽  
Noise Sources ◽  
Acoustic Performance ◽  
Common Noise ◽  
The Common

In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. The entire studies were conducted in a reverberation room. The effectiveness of jagged flap on mitigating diffracted sound was also studied. Three types of noises were examined in the current study—white noise, traffic noise and construction noises. The experimental results showed that the plenum window with perforated thin box could reduce 8.4 dBA, 8.7 dBA and 6.9 dBA of white, traffic and construction noises, respectively. The jagged flaps did not have significant effect on the plenum window’s noise mitigation performance. When frequencies were ranging from 800 Hz to 1250 Hz, when compared with the case of without perforated thin box, it was found that the perforated thin box had good acoustic performance where it was able to reduce additional 1.6 dBA, 1.6 dBA and 1.2 dBA of white, construction and traffic noises, respectively.

scholarly journals Numerical Evaluation of Sound Attenuation Provided by Periodic Structures

2013 ◽  
Vol 38 (4) ◽  
pp. 503-516 ◽  
Author(s):  
Mário Martins ◽  
Luís Godinho ◽  
Luís Picado-Santos
Keyword(s):  
Periodic Structures ◽  
Traffic Noise ◽  
Fundamental Solutions ◽  
Sound Attenuation ◽  
Method Of Fundamental Solutions ◽  
Noise Sources ◽  
Noise Abatement ◽  
Acoustic Performance ◽  
Sonic Crystals ◽  
Different Sources

Abstract The use of periodic structures as noise abatement devices has already been the object of considerable research seeking to understand its efficiency and see to what extent they can provide a functional solu- tion in mitigating noise from different sources. The specific case of sonic crystals consisting of different materials has received special attention in studying the influence of different variables on its acoustic performance. The present work seeks to contribute to a better understanding of the behavior of these structures by implementing an approach based on the numerical method of fundamental solutions (MFS) to model the acoustic behavior of two-dimensional sonic crystals. The MFS formulation proposed here is used to evaluate the performance of crystals composed of circular elements, studying the effect of varying dimen- sions and spacing of the crystal elements as well as their acoustic absorption in the sound attenuation provided by the global structure, in what concerns typical traffic noise sources, and establishing some broad indications for the use of those structures.

scholarly journals INFORMATION SUPPORT FOR TRANSPORT NOISES RESEARCH

2021 ◽  
Vol 4 (1) ◽  
pp. 95-102
Author(s):  
Ludmila P. Braginskaya ◽  
Oksana A. Kopylova
Keyword(s):  
Experimental Data ◽  
Human Activity ◽  
Traffic Noise ◽  
Calculated Data ◽  
Noise Pollution ◽  
Information Support ◽  
Residential Areas ◽  
Noise Sources ◽  
Computational Analyses ◽  
The Impact

Studies of traffic noise in residential areas, i.e. in areas designated for human activity, are very relevant due to the growth of noise pollution caused by the growth of traffic infrastructure. Noise parameters are measured in order to assess their compliance with hygienic standards, to verify the calculated data obtained, to identify noise sources. Experimental and theoretical works on the analysis of transport noise and assessment of risks from their influence have been carried out in ICM&MG SB RAS for the last several years. The information support for the research proposed by the authors is aimed at integrating data and knowledge on the assessment of risks from the impact of traffic noise. Researchers have meaningful access to the experimental data that have been collected during fieldwork on the registration of traffic noise, to their computational analyses, and to systematic information related to this issue.

Assessment of Traffic Noise Pollution due to Road Traffic

2021 ◽  
Vol 110 ◽  
pp. 87-97
Author(s):  
Gabriela Demian ◽  
Luminița Grecu ◽  
Mihai Demian
Keyword(s):  
Noise Level ◽  
Road Traffic ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Road Transport ◽  
Time Of Day ◽  
Regression Method ◽  
Noise Sources ◽  
Industrial Activities ◽  
Level Measurement

The paper presents aspects related to noise pollution due to road traffic in Drobeta Turnu Severin. The main noise sources in Drobeta Turnu Severin are: road transport, railway and industrial activities. Based on the noise level measurement performed to assess the traffic noise over a period of 7 years, namely between 2013 and 2019, on an important road traffic artery in the mentioned city, predictions for its level over the next three years are made, correlating it with the number of cars that are supposed to cross the artery. For this study a road where the equivalent noise level exceeded the limit almost every year, was chosen. For obtaining the correlation between our data we have used the regression method. The noise level depends on the time of day in which the measurements were made but also on the season. Another correlation, between the equivalent noise level, and the number and type of cars was made, for a winter day in 2020, on another important artery, in order to see how much influence these factors have, on the noise level.

scholarly journals Bird song and anthropogenic noise: vocal constraints may explain why birds sing higher-frequency songs in cities

2013 ◽  
Vol 280 (1754) ◽  
pp. 20122798 ◽  
Author(s):  
Erwin Nemeth ◽  
Nadia Pieretti ◽  
Sue Anne Zollinger ◽  
Nicole Geberzahn ◽  
Jesko Partecke ◽  
...  
Keyword(s):  
High Frequency ◽  
Life Histories ◽  
Vocal Communication ◽  
Traffic Noise ◽  
Low Frequency ◽  
Noise Pollution ◽  
Frequency Shifts ◽  
Severe Constraint ◽  
The Common ◽  
Common Blackbird

When animals live in cities, they have to adjust their behaviour and life histories to novel environments. Noise pollution puts a severe constraint on vocal communication by interfering with the detection of acoustic signals. Recent studies show that city birds sing higher-frequency songs than their conspecifics in non-urban habitats. This has been interpreted as an adaptation to counteract masking by traffic noise. However, this notion is debated, for the observed frequency shifts seem to be less efficient at mitigating noise than singing louder, and it has been suggested that city birds might use particularly high-frequency song elements because they can be produced at higher amplitudes. Here, we present the first phonetogram for a songbird, which shows that frequency and amplitude are strongly positively correlated in the common blackbird ( Turdus merula ), a successful urban colonizer. Moreover, city blackbirds preferentially sang higher-frequency elements that can be produced at higher intensities and, at the same time, happen to be less masked in low-frequency traffic noise.

scholarly journals LIFE SOUNDLESS: New Generation of Eco-Friendly Asphalt with Recycled Materials

Environments ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 48 ◽  
Author(s):  
Miguel Angel Morcillo ◽  
María Elena Hidalgo ◽  
María del Carmen Pastrana ◽  
David García ◽  
Juana Torres ◽  
...  
Keyword(s):  
Urban Areas ◽  
Dynamic Stiffness ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Traffic Density ◽  
Road Noise ◽  
Acoustic Performance ◽  
Stone Mastic Asphalt ◽  
High Level ◽  
Selection Of

Noise pollution coming from traffic noise has become an important issue in urban areas. Road noise is one of the main sources of high-level traffic noise. Road noise depends not only on tires but on the pavement. Therefore, a study of mixture parameters should be performed to achieve good acoustic performance. Another important point which has to be taken into account is the acoustic performance durability. Gap-graded mixtures were selected for this project due to poor experiences with open-graded mixtures in terms of performance durability, where texture and clogging issues appeared a few years after paving. The LIFE SOUNDLESS project is seeking different ways to modify stone mastic asphalt mixes to improve the noise attenuation of pavements. A selection of mixes with different additives were created, where some waste materials were used. The selection of the best mixtures was done not only according to traditional mechanical parameters but also others, such as damping and dynamic stiffness. Once the best mixtures had been paved, the acoustic performances were measured several times to evaluate the performance durability. Several experimental methods like the close proximity (CPX) method and statistical pass by (SPB) method were used to check the sound generation and propagation of every pavement. The project was carried out on two roads overseen by the Junta de Andalucía in Seville (Spain). The difference between both roads was the traffic density and the average speed. The noise level has since been reduced by 3 dB and 7 dB on both sites.

scholarly journals COLLABORATIVE NOISE MAPPING USING SMARTPHONE

2020 ◽  
Vol XLIII-B4-2020 ◽  
pp. 253-260
Author(s):  
R. Dubey ◽  
S. Bharadwaj ◽  
M. I. Zafar ◽  
V. Bhushan Sharma ◽  
S. Biswas
Keyword(s):  
Open Source ◽  
Prediction Models ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Noise Levels ◽  
Noise Sources ◽  
Noise Mapping ◽  
Effective Option ◽  
Noise Data ◽  
The Web

Abstract. Noise pollution is considered to be one of the most prevalent environmental challenges affecting human health. Noise pollution is increasing in cities needing techniques to monitor and predict the noise. The monitoring of traffic noise levels in different parts of the cities at different times has become very difficult due to logistic constraints. It is thus required to measure the noise levels at certain strategic locations, such as, near the noise sources (e.g., roads), and then to utilize it to predict the noise levels at surrounding locations. The challenge of monitoring the noise near several road crossings in a city can be reduced using a smartphone-based noise monitoring technique. However, the prediction of noise levels and showcase it as maps require terrain data, noise data, and noise prediction models. The requirement of terrain data can be met using open-source terrain data, from which various terrain parameters can be extracted and integrated with a standard prediction model on the web platform to predict the noise map for an area. Smartphone-based noise monitoring and its subsequent mapping can be a very popular and effective option, which uses a crowdsourcing approach. The entire methodology is tried to be applied over Lucknow city in India. Noise levels are monitored at three different slots, daily, over 14 road crossings using the smartphone-based app. Further, collected noise levels were calibrated against standard noise meter to ascertain accurate noise levels for these locations. Thereafter, three categories of noise environments are chosen from it and mapped using open-source satellite images and standard noise models, over the web on the GIS platform. The predicted noise levels on the maps were verified with the recorded noise data from similar locations using standard noise meter. For these three crossings at different times the predictions are found to be accurate within ±4.5 dB.

Environmental Noise Mitigation by Plenum Window with Sonic Crystals and Jagged Flap

2019 ◽  
Vol 18 (01) ◽  
pp. 1950001 ◽  
Author(s):  
Hsiao Mun Lee ◽  
Andi Haris ◽  
Kian Meng Lim ◽  
Jinlong Xie ◽  
Heow Pueh Lee
Keyword(s):  
White Noise ◽  
Experimental Studies ◽  
Environmental Noise ◽  
Noise Attenuation ◽  
Frequency Range ◽  
Noise Mitigation ◽  
Numerical Studies ◽  
Narrow Frequency Range ◽  
Sonic Crystals

A plenum window with incorporation of rectangular sonic crystals (SCs) in between two glass panes was tested in a reverberation room. Before the start of the experiment, numerical studies were performed on the whole structure in order to prove the effectiveness of the SCs in enhancing the noise attenuation performance of the plenum window. The effects of flat and jagged flaps on reducing strength of diffracted sound were also investigated in the experimental studies. White, traffic and construction noises were examined during each measurement. When the frequencies were ranging from 100[Formula: see text]Hz to 5000[Formula: see text]Hz, the plenum window with SCs without flap was able to attenuate 9.5, 8.5 and 8.6[Formula: see text]dBA of white, traffic and construction noises, respectively, compared with the case of without window. The effects of flat flaps on noise attenuation performance of the plenum window were negligible while the jagged flap was able to attenuate additional 1.7[Formula: see text]dBA of white noise and 1.6[Formula: see text]dBA of traffic and construction noises compared with the case of without flap. In the narrow frequency range of 900–1300[Formula: see text]Hz, the plenum window with SCs without flap was able to reduce additional 2.7, 2.3 and 2.5[Formula: see text]dBA of white, traffic and construction noises, respectively, compared with the case of without SCs.

scholarly journals Noise Pollution in Nigeria’s Institutions of Higher Learning: A Review

2020 ◽  
pp. 8-21
Author(s):  
Cornelius Ogbodo Anayo Agbo
Keyword(s):  
Noise Pollution ◽  
School Management ◽  
Higher Learning ◽  
Mitigation Measures ◽  
Noise Levels ◽  
Noise Mitigation ◽  
Noise Sources ◽  
Institutions Of Higher Learning ◽  
The Government ◽  
Higher Institutions

Education is the cradle of development and must be properly guarded. Higher institutions are citadels of learning engaging in high intellectual discourse that require quiet ambience. The high noise level in Nigeria’s institutions of higher learning has become a growing concern. This paper reviewed the studies done concerning noise pollution vis-à-vis the noise sources, its effects and abatement measures put in place if any. Modular mini electric generators, road traffics and religious organization’s activities were found culpable to the majority of noises produced both inside the institutions and their neighbourhoods. More than 90% of the institutions' community are exposed to disturbing noise levels. The review showed that most of the institutions’ measured noise levels range between 50 dB(A) and 110 dB(A). Also, the majority of the exposed persons feels helpless while hoping to habituate with the conditions. There is a need, therefore, for the school management to collaborate with the government to ensure that sustainable noise mitigation measures are put in place in the institutions to avert its negatives consequences on students’ performance and staff output.

Pengaruh bising lalu lintas terhadap penurunan fungsi pendengaran pada juru parkir di kota Denpasar

2013 ◽  
Vol 40 (2) ◽  
Author(s):  
Ni Ketut Susilawati ◽  
Wayan Sudana ◽  
Eka Putra Setiawan
Keyword(s):  
Hearing Impairment ◽  
Noise Exposure ◽  
Traffic Noise ◽  
Hearing Threshold ◽  
Noise Pollution ◽  
Simple Random Sampling ◽  
Cross Sectional Study ◽  
Control Group ◽  
Cross Sectional ◽  
Hearing Function

Background: Noise pollution or noise is an unwanted sound which is disturbing to human beings.However small or soft the sound, if it is undesirable it is considered as noise. Noise induced hearingloss is a sensorineural hearing loss that is commonly encountered second to presbycusis. Purpose: Toknow the effect of traffic noise exposure on hearing impairment to the employees of the Parking DistrictCompany of the Denpasar city and to improve diagnostic detection on hearing impairment caused bynoise. Method: A cross sectional study was conducted at the Parking District Company office. Thepopulations of this study were the employees of the Parking District Company. Samples of this study were the employees who were exposed to traffic noise and control samples were an employee who was unexposed. Samples were selected by simple random sampling. Results: From 40 parking attendants,27 persons (67.5%) aged above 35 years old. The parking attendants who had been working for ten to fifteen years were 36 persons (90%) and no history using ear protection when working. Seven persons(17.5%) had referred DPOAE upon examination with increase hearing threshold on audiogram result.In this study the parking attendants who had hearing deficit induced by noise were 7 persons (17.5%)and only one person (2.5%) in control group. There was a statistically significant effect of traffic noiseto hearing function deficit (p<0.05). Conclusion: Traffic noise has effect in hearing function deficit onthe parking attendants.ORLI Vol. 40 No. 2 Tahun 2010Key words: NIHL, parking attendant, audiometry, DPOAE.

Sign in / Sign up

Export Citation Format

Share Document