Application Analysis of Small Sound Barrier on Soundproof Windows under Line and Point Sound Sources

2013 ◽  
Vol 291-294 ◽  
pp. 1107-1112
Author(s):  
Yi Bin Lei ◽  
Mei Jun Jin
Keyword(s):  
Sound Source ◽  
Traffic Noise ◽  
Sound Insulation ◽  
Traffic Flows ◽  
Residential Areas ◽  
Sound Sources ◽  
Sound Barrier ◽  
Application Analysis ◽  
Sound Barriers ◽  
Sound Environment

Traffic noise can be classified as point and line sources according to different traffic flows. Intakes on bay windows and small sound barriers are always used to reduce the influences of traffic noise on high buildings along streets and improve sound environment in these residential areas. Through the studies of the diffraction sound attenuation difference curves of small barriers in point and line sound source conditions, this article aims at providing with not only feasible soundproof solutions and theoretical directions for the choice of sound insulation products, but also with theoretical bases for the research and exploration of acoustic proof windows. His template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.

scholarly journals Revealing the effect of rounded noise protection screens with finite sound insulation on an acoustic field around linear sound sources

2021 ◽  
Vol 1 (5 (109)) ◽  
pp. 16-22
Author(s):  
Vitalii Didkovskyi ◽  
Vitaly Zaets ◽  
Svetlana Kotenko
Keyword(s):  
Acoustic Field ◽  
Traffic Noise ◽  
The Body ◽  
Sound Insulation ◽  
Physical Parameters ◽  
Algebraic Equations ◽  
Sound Sources ◽  
Study Results ◽  
Almost All ◽  
Screen Model

This paper reports studying the reduction of traffic noise by rounded noise protection screens with finite sound insulation, that is, those that can pass sound. Almost all models of acoustic screens, which are examined by analytical methods, are either direct or such that disregard the passage of sound through the screen, that is, it is assumed that the screen sound insulation is non-finite. This approach made it possible to solve the problem for a simplified model analytically but made it impossible to analyze the required sound insulation of noise protection screens. In the current paper, the problem of investigating an acoustic field around the screen whose sound insulation is finite has been stated, that is, it was taken into consideration that a sound wave propagates through the body of the screen. In addition, a given problem considers a rounded screen, rather than vertical, which is also used in different countries. Such a problem was solved by the method of partial domains. This method has made it possible to strictly analytically build a solution to the problem by simplifying it to solving an infinite system of algebraic equations, which was solved by the method of reduction. The screen model was set by the values of the density and speed of sound in the screen material. This approach has made it possible to change the acoustic impedance of the screen material and thereby change the sound insulation of the screen. That has made it possible to quantify the effect of screen sound insulation on its effectiveness. It has been shown that the efficiency of noise protection screens with finite sound insulation is approaching the efficiency of acoustically rigid screens, provided that the screen's natural sound insulation is 13–15 dB greater than the estimated efficiency of the rigid screen. The study results could make it possible to more accurately assess the effectiveness of noise protection screens. Determining the screen acoustic efficiency would make it possible to set requirements for its sound insulation characteristics. That could make it possible to select the designs of noise protection screens with minimal physical parameters, such as thickness, weight, etc.

Analysis on Traffic Noise Attenuation by Using Sound Barrier

2014 ◽  
Vol 584-586 ◽  
pp. 776-779
Author(s):  
Xian Feng Huang ◽  
Chen Hui Zhu ◽  
Quan Shi
Keyword(s):  
Sound Source ◽  
Insertion Loss ◽  
Traffic Noise ◽  
Noise Attenuation ◽  
Noise Barriers ◽  
Sound Barrier ◽  
Noise Barrier ◽  
Significant Attenuation ◽  
Infinite Line ◽  
Insertion Losses

By applying noise insertion loss predicting model of the noise barriers, influencing factors on insertion loss of the sound barrier are investigated for achieving the significant attenuation effects. In term of the infinite line sound source and the finite length of the barriers, the sound insertion losses with varying parameters are calculated and compared. Finally, the meaningful results indicate that the economic and reasonable height and length of the noise barrier are gained to be beneficial for barrier design.

scholarly journals TECHNOLOGY OF THE MAINTENANCE OF ACOUSTIC COMFORT ON THE TRANSCAUCASIAN HIGHWAY IN THE ZONE OF THE RESIDENTIAL AREAS ADJUSTING THE MOTOR ROAD

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 211-215
Author(s):  
Ivan Alborov ◽  
Olga Burdzieva ◽  
Vladislav Zaalishvili
Keyword(s):  
Traffic Noise ◽  
Design Parameters ◽  
Sound Insulation ◽  
Residential Areas ◽  
The Road ◽  
Zinc Plant ◽  
Acoustic Comfort ◽  
Central Caucasus ◽  
The Republic ◽  
The Impact

The article presents the results of scientific research on the assessment of the acoustic characteristics of the interstate highway of the Central Caucasus, passing through the mountainous territory of the Republic of North Ossetia Alania in the residential area where the miners of the Sadon Lead-Zinc Plant live. A schematic diagram of the highway in the zone is shown, and a design diagram is given to determine the acoustic parameters of the impact of traffic noise on the habitat of the resident population. On the basis of the studies performed, the most effective design parameters of the acoustic shield are set, providing sanitary permissible sound pressure levels in apartments without additional sound insulation and in the zone of influence of roadside noise in the settlement at the maximum intensity of the traffic flow along the road. Recommendations on the effective operation of the acoustic shield and the method for estimating the noise factor in the mountain zone with a highly dissected relief are given.

Windows Sound Insulation Research with Different Glass

2014 ◽  
Vol 584-586 ◽  
pp. 1868-1871
Author(s):  
Xiao Dong Lu ◽  
Jin Hong Wang ◽  
Wei Ling Wang
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Sound Insulation ◽  
Road Traffic Noise ◽  
Laminated Glass ◽  
Sound Sources ◽  
The Road ◽  
Insulation Effect ◽  
On The Road ◽  
Better Than

As the weak area of the residence envelope’s, window’s sound insulation is very important in the way of indoor quiet assurance. Base on the road traffic noise as sound sources, the sound insulation comparative studies is made between the insulating laminated glass and double insulated glass. The article choose two similar rooms near the Gaoerji road in Dalian assembled with the different windows, one room’s window was assembled with the insulating laminated glasses, and the other was assembled with double insulated glasses. Research shows that sound insulation effect of the wall with insulating laminated glass is better than the wall with double insulated glass 4dB.

scholarly journals Assessment of the noise level on arterial streets depending on traffic flow indicators

2021 ◽  
Vol 2021 (2) ◽  
pp. 52-63
Author(s):  
Oleg Mironyuk ◽  
Keyword(s):  
Traffic Flow ◽  
Public Transport ◽  
Noise Level ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Traffic Flows ◽  
Residential Areas ◽  
Protection Measures ◽  
Arterial Streets ◽  
On The Road

The intensity of traffic flows increases every year and intensifies its impact significantly on urban territory's ecologic situation and natural environment. In Ukrainian cities, the growth of noise pollution is quite a topical problem as it has a significant impact on the environment because of the increase in car numbers. Traffic flow intensity and densification of the built-up area cause the increase of the noise level. As analytical methods of calculation of determination of traffic noise level have several disadvantages, then for assessing the level of noise on arterial streets of Lviv city, research is carried out with consideration of traffic flow indicators. One of the critical criteria that have an impact on noise pollution in the urban environment is traffic flow composition. Conducted research indicates that the speed of traffic flow creates significant noise pollution, especially on those streets where cobblestone is a road pavement. Freight and passenger transport that moves along arterial streets causes the increase of noise level and increases its impact on the city territory. On sections of arterial streets in peak periods of the day with high values of volume-capacity ratio and general share of freight and public transport of more than 30% in a flow, the noise exceeds the acceptable norms and has a harmful impact on the environment. That is why it is necessary to assess noise pollution and the development of protection measures from noise during the planning and construction of some urban regions or residential areas. It is established that to lower the noise level on streets, it is necessary to consider existing intersections of arterial streets and the regime of movement on them. To lower transport noise, it is necessary to distribute freight and transit transport by city streets more rationally, use qualitative public transport, and limit the maximal speed regime on city streets. Further research on the road network will provide an opportunity to assess the noise level distribution of traffic flows in Lviv city. It will help to determine the problem places and propose methods of combating traffic noise.

scholarly journals Influence estimation of the inclination angle of the top of the noise protection barrier on its efficiency

2021 ◽  
Vol 1 (1(57)) ◽  
pp. 12-16
Author(s):  
Vitaly Zaets
Keyword(s):  
Inclination Angle ◽  
Sound Source ◽  
Sound Field ◽  
Wide Frequency Range ◽  
Sound Insulation ◽  
Frequency Range ◽  
Noise Barriers ◽  
Sound Sources ◽  
Sound Levels ◽  
Number Of Publications

The object of research is the sound field from linear sound sources around a rounded noise barrier of the same height and different angles of inclination of the top part of the barrier. It is known that the effectiveness of noise protection barriers depends primarily on the geometric dimensions of the barrier and the relative position of the sound source, barrier and area of noise protection. A large number of publications have been devoted to the study of the influence of these factors and some others, such as the influence of the earth's surface, sound absorption, sound insulation of the barrier. However, these works did not study the effect of the angle of the top part of the barrier on the change in the barrier efficiency. In this paper, the reduction of sound levels from linear sound sources around noise barriers with different inclination angle of the top part of the barrier is investigated. Rounded barriers of the same height with different radii are considered, which made it possible to simulate barriers in which the top part of the barrier has a different inclination angle. An effectiveness of such barriers for various locations of the sound source, which could also affect the establishment of a pattern of changes in the effectiveness of barriers, is also considered. In addition, the results were analyzed over a wide frequency range. The calculation of the field around such a barrier was carried out using computer simulation using the finite element method. This method allows to easily change the geometric parameters of the barrier and the position of the sound source. The barriers were considered acoustically hard. Thus, an influence of the inclination angle of the top part of the barrier on the sound field around the barrier from various locations of sound sources in a wide frequency range is analysed. The results must be taken into account when designing noise barriers to reduce noise levels from traffic flows

Hygienic Substantiation of Acoustic Load Reduction Methods for Residential Premises

2020 ◽  
pp. 46-51
Author(s):  
AV Levanchuk ◽  
OI Kopytenkova ◽  
TA Afanasieva
Keyword(s):  
Human Body ◽  
Residential Buildings ◽  
Transport Infrastructure ◽  
Sound Insulation ◽  
Load Reduction ◽  
Traffic Flows ◽  
Residential Areas ◽  
High Noise ◽  
Railway Traffic ◽  
Acoustic Load

Summary. Introduction: Traffic flows cause noise discomfort in 75-80 % of urban territories. Automobile and railway objects located near residential buildings generate indoor noise levels that exceed current standards by 5–30 dB. Approximately 20–25% of the Russian population live in areas of excessive traffic-related acoustic load. Despite the existing methods of acoustic load reduction in residential quarters, the number of complaints about high noise exposures in residential buildings keeps growing. Our objectives was to give a hygienic substantiation of an additional method of acoustic load reduction in residential premises based on the results of analyzing the level of acoustic discomfort. Materials and methods: Measurements, assessment and analysis of the noise level along automobile roads and railways and in the reverberation chamber were carried out in accordance with the current regulatory and technical documentation using a noise/vibration meter and spectrum analyzer “EKOFIZIKA-110A”. Data was processed using the Signal+/110 Utilities software. We studied characteristics of sound insulation of airborne noise with polyester shutters with fire retardant impregnation. Results: The results showed that high noise exposure levels in residential areas with transport infrastructure. Automobile traffic flows form an acoustic load in the range of 71–84 dBA, urban railway traffic flows (trams) – 61–80 dBA, and a train – 66–77 dBA. The excess of hygienic standards at night can reach 32 to 39 dBA. The material with the best sound insulation properties was selected showing an efficiency of 5 dBA. Conclusions: Acoustic discomfort is now registered in urban residential areas with developed automobile and railroad networks. Available methods of soundproofing and noise mitigation are not effective enough or may not be used in the current urban development situation to reduce the risk of negative reactions of the human body to excessive noise exposures in residential premises, especially at night. A 5 dBA acoustic load reduction can lower the risk of negative reactions of the human body to noise exposures.

Sanitary and Hygienic Characteristics of the Ambient Air of Major Roads in an Industrial City

2021 ◽  
pp. 49-53
Author(s):  
SA Musikhina ◽  
VG Stepanova ◽  
EA Musikhina
Keyword(s):  
Carbon Monoxide ◽  
Urban Areas ◽  
Traffic Noise ◽  
Ambient Air ◽  
Traffic Density ◽  
Road Traffic Noise ◽  
Technical Equipment ◽  
Traffic Flows ◽  
Residential Areas ◽  
Co Concentrations

Summary. Introduction: In the modern urbanized environment, there is a tendency of increasing environmental stress related to the growth of technical equipment, intensification of the use of urban areas and the development of the complex transport network, which is a source of noise and air pollution. Understanding of this problem served as an incentive to conduct a sanitary inspection of the main transport routes of Omsk, which is an industrial metropolis with an irrational distribution of traffic flows, a large number of cars, and a practical absence of roadside landscaping. Our objective was to assess the main transport routes in the city of Omsk by studying the intensity of traffic flows, measuring traffic noise level and carbon monoxide (CO) concentrations on the roadway and in adjacent residential areas. Materials and methods: All measurements were taken during off-peak hours. Vehicle traffic counting was used to establish the proportion of freight and public transport cars in the total number of passing vehicles. The study objects included traffic density (the number of vehicles per hour), the average velocity of the traffic flow, the type of roadway coverage, the presence of a dividing line, and the type of highway noise barriers used. Results: Our findings showed that road traffic noise levels and CO concentrations measured at the highways and at the border of adjacent residential areas exceeded their maximum permissible values. Measures to reduce adverse health effects of traffic noise pollution and on-road vehicle emissions of carbon monoxide are proposed.

Motor Vehicle Exterior Sound Quality Improvement for Indoors

2006 ◽  
Author(s):  
Masao Ishihama ◽  
Hiromitsu Sakurai
Keyword(s):  
Engine Speed ◽  
Motor Vehicle ◽  
Traffic Noise ◽  
Low Frequency ◽  
Sound Quality ◽  
Sound Insulation ◽  
Frequency Range ◽  
Sound Environment ◽  
Frequency Components ◽  
Driving Conditions

The objectives of this study are these three items. 1) To find better indices than dB(A) for representing annoyances caused by motor vehicle traffic noise along highways. 2) To find the frequency range of motor vehicle exterior noise that should primarily be controlled to achieve better indoor sound environment along highways. 3) To find suitable vehicle driving conditions for evaluating indoor sound environment. To obtain the desired results psycho-acoustic experiments were conducted. Firstly, sound samples were collected with microphones placed at such locations as on a sidewalk, in front of a small house and at the center of a room inside of the house. The number of test vehicles was fifteen, consisting of six motorcycles and nine passenger cars. The driving conditions were full acceleration and mild acceleration usually found in normal traffic flow. Secondly, semantic differentiation method was used. Ten pairs of adjectives were used to scale the impressions of each sound sample. Finally, physical characters of the sound samples and their subjective evaluations were compared. The results were obtained as follows. 1) Six sound samples got more uncomfortable impression at indoors. These sound samples were collected by vehicles with sport-type mufflers. 2) The samples that indoor sound quality is degraded than outdoor contain high power in low frequency range below 200 Hz. These low frequency components penetrate through the housing walls more easily than higher frequency components. 3) The degradation of comfort impression was found in mild acceleration conditions. The low frequency components of sound samples for mild acceleration are larger than those for full acceleration. Though the throttle is not fully open in mild acceleration, low engine speed generates low frequency components, and eventually increased indoor sound power in the frequency range. The conclusions drawn from these results are, 1) Indoor sound samples should be included for evaluating sound environment along highways. 2) Mild acceleration is a better driving condition for evaluating indoor sound environment along highways. In this condition, very low engine speed causes low frequency component emission that penetrate into housing more than in heavy accelerating conditions. 3) Engine exhaust systems that emit very loud low-frequency components should be focused upon in regulating traffic noise. 4) Extensive collection and analysis of housing sound insulation, absorption and resonance data along highways are necessary for further investigations. 5) Better psycho-acoustic experiment methods should be developed for investigating sound context effects on panelists.

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