scholarly journals Noise attenuation provided by hedges

2019 ◽  
Vol 50 (3) ◽  
pp. 113-119
Author(s):  
Marcello Biocca ◽  
Pietro Gallo ◽  
Giuseppina Di Loreto ◽  
Giancarlo Imperi ◽  
Daniele Pochi ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Urban Areas ◽  
Noise Source ◽  
Urban Pollution ◽  
Noise Pollution ◽  
Urban Context ◽  
Noise Sources ◽  
The Past ◽  
Significant Attenuation ◽  
Green Barrier

During the past few decades, urban areas have experienced increasing environmental stress. Noise is considered as one of the most important sources of urban pollution with adverse effects on human health. Urban vegetation provides many ecosystem services including the reduction of noise pollution. Hedges are widespread in cities and have the peculiarity of being often grown close to the source of noise. The study investigated the noise reduction due to hedges of Prunus laurocerasus and Laurus nobilis and the effect of the vegetation on sound spectra. Four different trials were carried out, including the use of two different noise sources and the measurement of noise at different distances both from the green barrier and from the noise source. During one trial, the influence of the type of ground surfaces between the noise source and the receiver was also evaluated. In the three trials where a significant attenuation of the noise occurred, the porosity of hedges measured less than 4.6% and an average noise reduction of about 2.7 dB(A) (max 7.0 dB(A)) was observed. This effect was particularly relevant in the range of higher frequencies (between 2 and 20 kHz). This study can contribute to plan and design hedges in the urban context.

Approaches to Urban Noise Management in India

2012 ◽  
Author(s):  
Neelima S. Naik
Keyword(s):  
Urban Areas ◽  
Central Government ◽  
Environmental Concern ◽  
Noise Pollution ◽  
Noise Levels ◽  
Urban Noise ◽  
Master Plans ◽  
The Past ◽  
Metropolitan Cities

Noise pollution in urban areas is recognized as a major environmental concern in India. The lack of infrastructure and fast paced life in major metropolitan cities of India has made the urban environment extremely crowded, busy as well as noisy and as a result the millions of people living in the major metropolitan areas are suffering from the impacts of noise pollution. Noise levels are escalating at such a rate that it has become a major threat to the quality of human lives. Direct links between noise and health have been established by research conducted over the past few decades. There are several causes for urban degradation such as population migration, environmental considerations not adequately being incorporated into master plans, uncoordinated and haphazard development, weak implementation of plans and laws and inadequate institutional competences and resource crunch. This paper discusses the causal factors, impacts and the different approaches adopted by the Central Government as well as some major State Pollution Control Boards to curb the urban noise problem and the need for looking into non-conventional solutions such as Ecocity programme to bring in visible environmental improvement.

scholarly journals Noise Pollution in Urban Residential Environments: Evidence from Students’ Hostels in Awka, Nigeria

2021 ◽  
Vol 12 (1) ◽  
pp. 51-62
Author(s):  
Nicholas OBI ◽  
◽  
Joy Sylvia OBI ◽  
Eziyi IBEM ◽  
Dickson NWALUSI ◽  
...  
Keyword(s):  
Urban Areas ◽  
Residential Buildings ◽  
Noise Pollution ◽  
Sound Level ◽  
Noise Levels ◽  
Noise Sources ◽  
Chi Square ◽  
Sound Barriers ◽  
Level Meter ◽  
Area Data

Noise pollution and its concomitant effects on humans and environment has reached dangerous levels in many urban areas across the world. However, very little is known about the sources and effects of noise pollution within students’ hostels in a developing country like Nigeria. This study investigated urban noise pollution in residential neighbourhoods, using the Nnamdi Azikiwe University students’ off-campus accommodation in Awka, southeast Nigeria as the study area. Data were obtained through measurements of noise levels using sound level meter and by conducting a survey to gather feedback from 260 students in the study area. Descriptive statistics and Chi-Square tests were used to analyse the data; the results revealed mean noise levels of 89.8 dB(A) and 46.9 dB(A) during noisy and quiet periods, respectively. The main sources of noise were portable electricity generators, vehicular traffic and loudspeakers used by students and business operators; they were found to have deleterious effects such as low tolerance, headache, anger, lack of concentration and low productivity on the students. The study concludes by noting that to effectively minimize the effects of noise pollution within urban residential neighbourhoods in the study area and beyond, architects and urban planners should engage in proper land use zoning and the application of sound absorbing materials on walls and locating balconies of residential buildings away from noise sources. In addition, vegetation belts and sound barriers of earth mounds or wood, metal or concrete could also be constructed between the sources of noise and residential buildings, especially in the case of roadside communities.

The interplay of tourism and noise: A literature review

2021 ◽  
Vol 263 (2) ◽  
pp. 4111-4119
Author(s):  
Lisa-Marie Wadle ◽  
Noemi Martin
Keyword(s):  
Literature Review ◽  
Noise Reduction ◽  
Noise Source ◽  
Economic Factor ◽  
Research Interest ◽  
Future Research ◽  
Noise Sources ◽  
Search Results ◽  
New Methods ◽  
Research Areas

Tourism is an important economic factor for countries, cities and individual beings. However, tourism also has an impact on the environment, e.g. in terms of noise. This does not only constitute a burden for locals but also effects tourists whose goal, among others, commonly is to rest during their holidays. A literature review was conducted covering the last ten years (2011-2021) and will be updated until the conference. The terms or and noise as well as synonyms and related terms were used in the search string. The search results in over 400 documents which were reduced based on their fit to the area of research interest and a practical screening. The overview gained by reviewing the literature indicates the most common noise sources with relation to tourism. Furthermore, several studies were found which analyse the consequences for locals and how they react to and deal with the noise. Some of the studies focused on measures taken on noise reduction like reducing the noise source itself, developing new methods to measure or visualize noise as well as structural measures. Based on this review, future research areas were identified.

Noise Source Identification and Noise Reduction of PDP TV Using Transfer Path Analysis

2010 ◽  
Author(s):  
Hyung-Taek Kwak ◽  
Ji-Hyun Yoon ◽  
In-Hyung Yang ◽  
Jung-Youn Lee ◽  
Jae-Eung Oh
Keyword(s):  
Path Analysis ◽  
Noise Reduction ◽  
Noise Source ◽  
Analysis Method ◽  
Noise Sources ◽  
Transfer Path ◽  
Input Signals ◽  
Noise Source Identification ◽  
Absorbing Materials ◽  
Transfer Path Analysis

The module which is used for the operation of PDP TV consists of three main PCB board, X-board, Y-board, SMPS. Numerous studies on identifying noise sources of PDP TV, and reducing the noise have so far been done through experiments. However, it has been difficult to identify the exact noise sources due to correlations between sources as they are located close to each other. For that reason, Multi-Dimensional Spectral Analysis, MDSA, one of Transfer Path Analysis method, is increasingly required since it enables a quantitative analysis of each input signal’s contribution to the out signal to be carried out by eliminating the correlations of input signals. In this study, Transfer Path Analysis using MDSA is implemented to determine the quantitative noise contribution of each board. And the possibility of noise reduction is confirmed through the experimental method that isolates the most contributing board by adding sound-absorbing materials to it.

scholarly journals Noise Annoyance in the UAE: A Twitter Case Study via a Data-Mining Approach

2021 ◽  
Vol 18 (4) ◽  
pp. 2198
Author(s):  
Andrew Peplow ◽  
Justin Thomas ◽  
Aamna AlShehhi
Keyword(s):  
Social Media ◽  
United Arab Emirates ◽  
Noise Source ◽  
Search Algorithm ◽  
Noise Pollution ◽  
Health Concern ◽  
Global Public Health ◽  
Noise Sources ◽  
Noise Annoyance

Noise pollution is a growing global public health concern. Among other issues, it has been linked with sleep disturbance, hearing functionality, increased blood pressure and heart disease. Individuals are increasingly using social media to express complaints and concerns about problematic noise sources. This behavior—using social media to post noise-related concerns—might help us better identify troublesome noise pollution hotspots, thereby enabling us to take corrective action. The present work is a concept case study exploring the use of social media data as a means of identifying and monitoring noise annoyance across the United Arab Emirates (UAE). We explored an extract of Twitter data for the UAE, comprising over eight million messages (tweets) sent during 2015. We employed a search algorithm to identify tweets concerned with noise annoyance and, where possible, we also extracted the exact location via Global Positioning System (GPS) coordinates) associated with specific messages/complaints. The identified noise complaints were organized in a digital database and analyzed according to three criteria: first, the main types of the noise source (music, human factors, transport infrastructures); second, exterior or interior noise source and finally, date and time of the report, with the location of the Twitter user. This study supports the idea that lexicon-based analyses of large social media datasets may prove to be a useful adjunct or as a complement to existing noise pollution identification and surveillance strategies.

Noise Source in Automobile and Control Method for Environmental Protection

2013 ◽  
Vol 853 ◽  
pp. 373-376
Author(s):  
Ji Xuan Yuan ◽  
Hui Min Fu
Keyword(s):  
Environmental Protection ◽  
Control Method ◽  
Noise Source ◽  
Influence Factors ◽  
Noise Pollution ◽  
Pollution Source ◽  
Control Methods ◽  
Noise Sources ◽  
And Control ◽  
Active Control Method

As one of the environmental pollution sources, the noise problem in recent years has been as the focus of environmental protection control. As the noise pollution source, automobile noise has been studied in this article. At First, the influence factors of automobile noise are introduced, and then the major noise sources are all analyzed. Finally, three kinds of control methods such as noise control method from mechanical theory, from acoustic theory and active control method are introduced.

Research on Noise Reduction in Boiler Room - An Actual Case on North Boiler Room

2011 ◽  
Vol 467-469 ◽  
pp. 2159-2162
Author(s):  
Ji Hong Zhou ◽  
Jian Guo Tan ◽  
Hong Xia Wang ◽  
Hai Zhen Ma
Keyword(s):  
Noise Reduction ◽  
Spectrum Analysis ◽  
Reduction Method ◽  
Noise Source ◽  
Noise Pollution ◽  
Sound Insulation ◽  
Actual Case ◽  
Absorbing Material ◽  
Boiler Room ◽  
Induced Draft Fan

As to the noise pollution of the Hebei University of Engineering north boiler room, we have conducted a series of actual research, monitoring, and analysis of the spectrum of various monitoring sites. According to the results of the spectrum analysis, we found the noise source and proposed noise reduction measures, namely the establishment of sound insulation room in which the drums and induced draft fan installed, and the wall of the room are appended acoustic sound--absorbing material. The results show that this noise reduction method is feasible.

scholarly journals NOISE POLLUTION IN URBAN AREAS. CASE STUDY – CLUJ-NAPOCA TOWN

1970 ◽  
Vol 63 ◽  
Author(s):  
Tania Mihăiescu ◽  
Antonia Odagiu
Keyword(s):  
Urban Areas ◽  
Noise Pollution ◽  
High Rate ◽  
Noise Levels ◽  
Human Environment ◽  
The Past ◽  
State And Local Government ◽  
State And Local

Noise is a disturbance to the human environment that is escalating at such a high rate that it will become a major threat to the quality of human lives. In the past thirty years, noise in all areas, especially in urban areas, has been increasing rapidly. There are numerous effects on the human environment due to the increase in noise pollution. Slowly, insensibly, we seem to accept noise and the physiological and psychological deterioration that accompanies it as an inevitable part of our lives. Although we attempt to set standards for some of the most major sources of noise, we often are unable to monitor them. Community awareness of environmental noise has increased and there is a higher expectation for state and local government to reduce noise levels. The present study provides an evaluation of noise pollution in Cluj-Napoca. Equivalent noise levels (L eq) were measured in 10 points (each point measured during 30 min). Measured values were confronted with Romanian legislation allowed limits. The most noise-polluted points in Cluj Napoca were Mănăştur district – traffic circle and Aurel Vlaicu street (at the international airport limit), with measured L eq of 75.5 dB(A) and 75.91 dB(A).

Quantification of aerodynamically induced noise and vibration-induced noise in a suction unit

2011 ◽  
Vol 225 (3) ◽  
pp. 617-624 ◽  
Author(s):  
J Prezelj ◽  
M Čudina
Keyword(s):  
Transfer Function ◽  
Noise Reduction ◽  
Noise Source ◽  
Operating Conditions ◽  
Frequency Range ◽  
Centrifugal Blower ◽  
Noise Sources ◽  
Noise And Vibration ◽  
Different Types ◽  
The Individual

Noise, generated by a centrifugal blower, can be divided according to its origin, into aerodynamically induced noise and vibration-induced noise. The contribution of the individual noise source to the total emitted noise is hard to determine, but it is crucial for the design of noise reduction measures. In order to reduce the noise of the centrifugal blower in a broad range of operating conditions, an identification of noise sources needs to be performed. An analysis of the most important noise origin in a centrifugal blower presented in this article was performed by measurements of the transfer function between noise and vibration, under different types of excitation. From the analyses one can conclude that the dominant noise source of a centrifugal blower can be attributed to the aerodynamically generated noise which exceeds the vibration-induced noise for more than 10 dB in a broad frequency range.

Automotive Air Conditioning Compressor Noise Source Identification Method

2015 ◽  
Vol 741 ◽  
pp. 397-400
Author(s):  
Xiao Bo Huang ◽  
Jun Ye ◽  
Shu Sheng Xiong ◽  
Bin Tao Mao ◽  
Ying Hui Wang ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Air Conditioning ◽  
Noise Source ◽  
Air Conditioner ◽  
Noise Sources ◽  
Major Objective ◽  
Identification Methods ◽  
Automotive Air Conditioning ◽  
Automobile Air Conditioner ◽  
Noise Source Identification

With the improvement of requirements for vehicle comfort, people put forward higher requirements on the noise control of automotive air conditioning. As the power source of the automobile air conditioner, the compressor is also the main noise sources, so it is the major objective of vibration damping and noise reduction. In this paper, with analyzing the noise mechanism of compressor, introduces four identification methods of automotive air conditioning compressor noise source, providing theoretical basis for automobile air conditioning damping and noise reduction.

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