Journal articles on the topic 'Noise barriers'
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1
Strazdas, Edgaras, and Tomas Januševičius. "NOISE BARRIERS EFFICIENCY DEPENDENCE ON THEIR SHAPE AND GEOMETRY." Mokslas - Lietuvos ateitis 15 (September 18, 2023): 1–5. http://dx.doi.org/10.3846/mla.2023.19430.
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The work examines noise barriers and evaluates their effectiveness when changing their geometry and shape. Noise barriers are one of the most effective and widely used methods of reducing noise caused by road and railway transport. The effectiveness of the barrier depends on the materials used in the construction, the barrier’s height, geometry, shape, and the acoustic properties of the additional elements installed on top of the barriers. The aim of the work is to review and analyze the scientific literature, which would allow to evaluate the dependence of the acoustic characteristics of noise-reducing barriers on the geometry and shape of the barrier, and to provide recommendations for the design and selection of noise barriers.
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Menounou, Penelope, and Evangelos Papaefthymiou. "Use of Noise Barriers for Helicopter Noise Mitigation." Noise & Vibration Worldwide 40, no. 5 (May 2009): 10–21. http://dx.doi.org/10.1260/095745609788549248.
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The possibility of using noise barriers for helicopter noise mitigation is numerically investigated. The noise field produced by an isolated main rotor in the presence of a barrier on the ground is predicted by employing and appropriately modifying existing diffraction and reflection models. It is shown that noise barriers can provide substantial shielding from helicopter noise and conclusions are drawn regarding barrier configuration and helicopter operations.
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Redondo, Javier, Pau Gaja-Silvestre, Luis Godinho, and Paulo Amado-Mendes. "A Simple Method to Estimate the In Situ Performance of Noise Barriers." Applied Sciences 12, no. 14 (July 12, 2022): 7027. http://dx.doi.org/10.3390/app12147027.
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Noise barriers are usually classified attending to their intrinsic acoustic characteristics. This is standardized by the European Standards EN 1793, parts 2 and 6, in which a single parameter, DLR or DLSI, is defined in order to quantify the sound insulation performance of noise barriers. However, the final performance of a noise barrier, quantified by the so-called insertion loss, IL is not only dependent on the insulation provided by the noise barrier, but it is as well affected by geometrical aspects and the acoustic characteristics of the environment where these noise-reducing devices are placed. In this work, we explore the relationship between the insertion loss and the acoustic insulation by means of numerical methods. Moreover, the authors propose a simple way to predict the insertion loss from a purely acoustic numerical simulation in which this parameter is obtained for a completely rigid noise barrier, and knowing the noise barrier’s sound reduction index, in one third octave bands.
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Ayrbabamyan, S. A., and E. A. Bugarev. "Types of noise barriers." Izvestiya MGTU MAMI 7, no. 1-4 (July 10, 2013): 134–38. http://dx.doi.org/10.17816/2074-0530-67851.
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Song, Lei Ming, Shou Guang Sun, and Xin Hua Zhang. "Research on Effect of Noise Emission from Railway Viaduct on Noise Reduction of Noise Barriers." Advanced Materials Research 433-440 (January 2012): 1852–56. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.1852.
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Noise sources identification based on microphone array theory was firstly introduced, A method was derived, which can be used to analyze effect of noise emission from railway viaduct to noise reduction of noise barriers. Vibration and noise emission of railway viaduct and noise barrier were studied using field testing with microphone array technology and vibration testing. The results concluded that noise emission from the viaduct has remarkable effects on noise reduction of noise barriers compared with the effects of noise emission from the noise barriers themselves, which is neglectable.
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Wu, Xiaoping, Xuanyi He, and Jie Huang. "Comparative Analysis of Dynamic Responses of Different Types of High-Speed Railway Noise Barriers under the Influence of Fluctuating Wind Pressure." Sustainability 14, no. 19 (October 10, 2022): 12900. http://dx.doi.org/10.3390/su141912900.
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The fluctuating wind pressure generated when a high-speed train passes through the noise barrier will cause deformation and damage to the noise barrier, affecting the safety of train operation and causing serious economic losses. In this paper, a research method for the dynamic response of noise barriers is proposed, and a comparative study of vertical noise barriers and semi-enclosed noise barriers is carried out. The study shows that when trains pass through the noise barrier, the fluctuating wind pressure on the surface of the two different types of noise barriers both exhibit the characteristics of head and tail waves; the time course curve of fluctuating wind pressure has the same change rule, the wind pressure reaches the maximum value at the bottom measuring point, the maximum value of fluctuating wind positive pressure and negative pressure of the semi-closed noise barrier is larger than that of the vertical noise barrier. In terms of natural frequency, the natural frequency range of the vertical noise barrier is 16~85 Hz, and the natural frequency range of the semi-enclosed noise barrier is 3~13 Hz. The natural frequency of the semi-enclosed noise barrier partially coincides with the main frequency of fluctuating wind pressure, which may lead to resonance damage. When the train speed is raised from 200 km/h to 350 km/h, the maximum equivalent force of the semi-enclosed noise barrier reaches 17.21 Mpa, which is much larger than the maximum equivalent force of the vertical noise barrier. At the same time, the displacement of the two noise barriers increases with the height of the noise barrier, and the maximum displacement of the semi-closed noise barrier unit board reaches 3.63 mm, which is much larger than that of the vertical noise barrier unit board.
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Owolabi, Oludare, and Joseph Aina. "Review of utilization of short concrete noise barriers as noise an abatement strategy." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 266, no. 1 (May 25, 2023): 1311–20. http://dx.doi.org/10.3397/nc_2023_0181.
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The initial construction cost of barriers has led to considerable interest by local Transportation agencies and the Federal Highway Administration (FHWA) to assess alternatives such as short noise barriers. Many agencies have found that the utilization of short concrete safety barriers as a noise mitigation strategy is highly beneficial. However, not much evaluation data is available to satisfy the FHWA noise requirements or to satisfy the Noise Reduction Design Goal (NRDG) (Noise Barrier Acceptance Criteria Analysis Publication No. FHWA-HEP-16-017). This paper presents an extensive review of the utilization of short concrete noise barriers as a noise abatement strategy. The study also reviews the relevant research, methodologies, tools, and technologies that have been used in evaluating the reasonableness and feasibility of this strategy. Various modeling techniques that can realistically model the insertion loss of short concrete noise barrier were also reviewed. A few proprietary short noise barrier systems were also evaluated for their reasonableness and feasibility. The study reveals a state of the practice survey of all DOTs with respect to the adoption and implementation of short noise barrier. The paper ultimately highlights the effectiveness, cost, use and implementation methodology of short solid barriers as an effective noise abatement strategy.
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Gong, Liyuan, and Xiuling Wang. "Numerical Study of Noise Barriers’ Side Edge Effects on Pollutant Dispersion near Roadside under Various Thermal Stability Conditions." Fluids 3, no. 4 (December 8, 2018): 105. http://dx.doi.org/10.3390/fluids3040105.
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Roadside noise barrier helps to reduce downwind pollutant concentrations from vehicle emission. This positive characteristic of the construction feature can be explained by its interaction with flow distribution and species dispersion. In this paper, a three-dimensional numerical model has been developed to simulate highway pollutant dispersion—a realizable k-ε model was employed to model turbulent flow, and a non-reaction species dispersion model was applied to simulate species transport. First, numerical models were validated with experimental data, and good agreement was observed. Then, detailed simulations were conducted to study double barriers’ effects on highway pollutant dispersion under different settings: noise barriers with different heights, noise barriers with and without edge effects, and different atmospheric thermal boundary conditions. Results show that: (1) Noise barriers without edge effects cause bigger downwind velocity and turbulence intensity than noise barriers with edge effects. (2) At ground level, lower downwind pollutant concentration and higher pollutant concentration, near upwind barrier and between barriers, are observed for noise barriers without edge effect cases; higher on-road pollutant concentration can be seen near barrier side edges for cases with edge effect. (3) Downwind velocity and turbulence intensity increase as barrier height increases, which causes reduced downwind pollutant concentration. (4) With the same barrier height, under unstable atmospheric boundary condition, the lowest pollutant concentration can be found for both downwind and between barriers. Overall, these findings will provide valuable inputs to noise barrier design, so as to improve roadside neighborhood air quality.
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Wu, Xiaoping, Ye Zhu, Lingxiao Xian, and Yingkai Huang. "Fatigue Life Prediction for Semi-Closed Noise Barrier of High-Speed Railway under Wind Load." Sustainability 13, no. 4 (February 16, 2021): 2096. http://dx.doi.org/10.3390/su13042096.
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The fatigue state of the semi-closed noise barrier directly affects driving safety, and replacement after damage leads to train delays and increased operating costs. It is more eco-friendly and sustainable to predict the fatigue life of noise barriers to reinforce the structure in time. However, previous life prediction methods provide a limited reference in the design stage. In this study, a novel fatigue life prediction method for noise barriers was proposed. The computational fluid dynamics and finite element model of the semi-closed noise barrier were established and subjected to simulated natural wind and train aerodynamic impulse wind loads to calculate the stress time-history on the noise barrier. Based on the rain flow counting method and Miner linear cumulative fatigue damage theory, the fatigue life of noise barriers in three Chinese cities was predicted. The results show that the fatigue life of the noise barrier is closely related to the wind conditions and train operation modes. Targeted reinforcement for noise barriers in different fatigue states can save materials and reduce maintenance workload. Moreover, the influence of wind load on the noise barrier was summarized, and engineering suggestions on prolonging the fatigue life of noise barriers were put forward.
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Liu, Dongyun, Chao Wang, Jaime Gonzalez-Libreros, Ola Enoksson, Tommy Hojsten, Yongming Tu, Lennart Elfgren, and Gabriel Sas. "Numerical simulation of train-induced aerodynamic pressure on railway noise barriers." Journal of Physics: Conference Series 2647, no. 10 (June 1, 2024): 102002. http://dx.doi.org/10.1088/1742-6596/2647/10/102002.
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Abstract Noise barriers built parallel to the railway to reduce noise pollution, will be subjected to strong aerodynamic pressure from high-speed trains and have significant dynamic responses under such pressure. Based on computational fluid dynamics (CFD), the numerical simulation of train-induce aerodynamic pressure on noise barriers was performed. Time-varying pressure and its distribution along height direction of noise barriers were analysed, and the effect of different factors on results, i.e., the distance from noise barriers to track centre and height of noise barrier, were discussed. Results show that the geometric changes in train head and tail cause the obvious transient pressure pulse, and the pressure magnitude from head is higher than that from tail. With the measuring height increases, the pressure gradually decreases, which can be well characterized by height coefficient equation from Germany DB code. The pressure magnitude increases non-linearly with the distance to track centre decreases. Importantly, height of noise barrier is also an important factor affecting pressure magnitude on noise barriers and with the height of noise barrier increases, the pressure magnitude gradually increases but tends to be stable at higher height. Exponential equation can well characterize such effect of height of noise barrier on train-induced aerodynamic pressure.
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Dudiev, Tikhon, and Vladimir Tupov. "Method of Acoustic Calculation of Traffic Noise Barriers." MATEC Web of Conferences 320 (2020): 00034. http://dx.doi.org/10.1051/matecconf/202032000034.
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Installation of noise barriers is an efficient and relatively cheap way of protecting residential areas from traffic noise. This paper proposes a comprehensive method of calculation of noise barriers. The method allows determining the optimal sizes of the barrier meeting acoustic and cost requirements. The calculation method takes into account the noise coming from the both parts of the traffic flow shielded and not shielded by the barrier, as well as sound reflected from the road surface, the opposite barrier, if present, and both barriers.
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Monazzam, M. R., and Samaneh M. B. Fard. "A Study on the Effect of Different Median Barrier Shapes in Presence of Single or Parallel Noise Screens." Advanced Materials Research 383-390 (November 2011): 5432–37. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5432.
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In most mega cities roadside barriers are used to protect receivers from noise pollution during recent years. Median noise barriers, like roadside noise barriers, can be employed to reduce the impact of traffic on roadside communities. In this study, a 2D boundary element method (BEM) is used to predict the insertion loss of different barrier models. It was shown that the performance of a median barrier along with a roadside barrier is affected if another road side barrier will be erected. However, it is possible to apply some new barrier designs to decline the negative effect of the extra roadside barrier. The best shape for inclined median barriers when erected inside parallel barriers was seen to be the tilted designed with 10 degrees slope.
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Nong, Xingzhong, Xinwei Luo, Qingsong Feng, Hao Zhou, and Qinming Tu. "Analysis of the effect of combined noise reduction measures of trapezoidal sleeper and sound barrier on elevated line." Noise Control Engineering Journal 70, no. 6 (November 1, 2022): 562–73. http://dx.doi.org/10.3397/1/377049.
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In this paper, a noise test on the viaduct of a city in China was conducted to analyze the effect of trapezoidal sleepers, sound barriers, and the combination of trapezoidal sleepers and sound barriers on the spatial distribution characteristics of overall noise. A statistical energy analysis model was established to analyze the influence of these sound barrier configurations. The results show that at the speed of 60 km/h, the trapezoidal sleeper track can reduce the overall noise by 2.0 dB to 6.0 dB. The upright-type sound barrier can reduce the overall noise by 10.3 dB to 13.2 dB, with the most significant frequency band of noise reduction above 800 Hz; the combination of the trapezoidal sleeper and sound barrier has a significant noise reduction effect above 31.5 Hz, and the overall noise reduction can reach 13.8 dB to 23.1 dB. The high-frequency wheel-rail noise decays faster with distance, while the low-frequency bridge structure noise decays slowly with distance. When sound barriers are set up on both sides of the viaduct, the sound pressure level at the near field point is further reduced by 3.3 dB to 5.2 dB compared with sound barriers on only one side. Compared with a section with no sound barriers, the noise inside the sound barriers is about 1.2 dB higher than when the sound barriers are set on one side or both sides of the viaduct.
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Sato, Daigo, Takeshi Sueki, Yukio Abe, Kenjiro Yamamoto, and Yuta Nakamura. "Evaluation of noise reduction performance of new steel noise barrier for Shinkansen." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 7 (November 30, 2023): 1529–36. http://dx.doi.org/10.3397/in_2023_0231.
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Since Shinkansen viaducts are aged, a large-scale renovation project has been planned. In this project, aged noise barriers are scheduled to be removed and replaced. In this background, it is required to develop a new noise barrier with high constructability and high effectiveness in noise reduction. Therefore, the authors have developed a steel noise barrier without the decrease of noise barrier performance, of which weight is about 1/3 of existing concrete noise barriers. It is expected that the load on floor slabs by the developed noise barrier is more reduced, and no crane truck is basically needed for installation work. One of the features of the developed noise barrier is that all the surfaces on track side are consisted of sound absorbing materials with steel plates with small holes on it. The sound absorbing material used in the developed noise barriers has suitable sound absorbability for the frequency characteristics of the noise generated during train running. In order to evaluate the noise reduction performance, the developed noise barrier was tested on the Shinkansen track and noise measurement was conducted at the place with certain distance from the Shinkansen viaduct. As a result, the noise generated from the lower part of cars was significantly reduced on the overall level.
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Grubeša, Sanja, Hrvoje Domitrović, and Kristijan Jambrošić. "Performance of Traffic Noise Barriers with Varying Cross-Section." PROMET - Traffic&Transportation 23, no. 3 (June 28, 2011): 161–68. http://dx.doi.org/10.7307/ptt.v23i3.119.
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The efficiency of noise barriers largely depends on their geometry. In this paper, the performance of noise barriers was simulated using the numerical Boundary Element Method (BEM). Traffic noise was particularly considered with its standardized noise spectrum adapted to human hearing. The cross-section of the barriers was varied with the goal of finding the optimum shape in comparison to classical rectangular barriers. The barrier performance was calculated at different receiver points for a fixed barrier height and source position. The magnitude of the insertion loss parameter was used to evaluate the performance change, both in one-third octave bands and as the broadband mean insertion loss value. The proposed barriers of varying cross-section were also compared with a typical T-shape barrier of the same height.
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Cubick, Karel, and Judith Rochat. "Solid safety barriers as a highway traffic noise reduction strategy." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (June 24, 2022): 836–46. http://dx.doi.org/10.3397/nc-2022-824.
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Placing solid safety barriers (concrete crash barriers) along a highway, instead of steel guard rail, can help reduce traffic generated noise at nearby sensitive sites. The effectiveness of these barriers on traffic noise levels is dependent on the height of the barrier, the number of traffic lanes, vehicle mix, and the elevation of the receiver relative to the barrier. The effect of solid safety barriers for sites at a variety of distances from a highway has been investigated for both city streets and freeways of various widths using the U.S. Federal Highway Administration Traffic Noise Model (TNM). TNM predicted noise level reductions, attributable to solid safety barriers, were developed for research scenarios in locations with both hard soil and lawn ground types. Results show a readily perceptible and sometimes substantial noise reduction at sites within a few hundred feet of the roadway.
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Febrianti, Denisa Eka, Alfi Tranggono Agus Salim, Wida Yuliar Rezika, Muhamad Azwar Annas, and Suyatno Suyatno. "Effectiveness of Noise Barriers Based on Waste Materials in Case Study of Residential Noise Due to Double-Track Railways." Journal of Physics and Its Applications 6, no. 1 (November 27, 2023): 18–23. http://dx.doi.org/10.14710/jpa.v6i1.19992.
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The noise pollution in residential areas adjacent to double-track railways can significantly disturb the comfort and well-being of residents. The noise originates from passing trains on these double-track railways. The research problem aims to compare the noise levels in the residential area with the standard noise threshold and evaluate the effectiveness of a noise barriers based on waste material called sustainable noise barrier. The effectiveness of reducing noise levels for communities residing near the dual railway lines. The sustainable noise barrier is constructed using waste cardboard and sawdust as sound absorbers for reducing noise from passing trains. The objective of the research is to analyze the noise levels in the residential areas near the dual railway lines, referring to the noise threshold value specified in Kep.MenLH No.48 of 1996, which is 55 dBA. Additionally, the research aims to assess the effectiveness of the sustainable noise barrier in mitigating noise pollution in these residential areas. The research employs a quantitative experimental method, following the SNI 8427 of 2017 standard for measuring residential noise pollution and determining the sustainable noise barrier's effectiveness using Insertion Loss (IL) and Sound Transmission Loss (STL) measurements in both laboratory-scale and existing conditions (alongside the double-track railways). The research findings indicate that the noise levels in residential areas adjacent to dual railway lines exceed the threshold value, reaching 78.08 dBA. However, the sustainable noise barrier proves to be effective in reducing noise pollution by 27 dB at a frequency of 1,000 Hz in the residential areas neighboring the double-track railways. This research suggests that limiting noise disturbances in residental areas bordering railway lines is one solution with noise barriers.
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Zaets, Vitaly. "Influence estimation of the inclination angle of the top of the noise protection barrier on its efficiency." Technology audit and production reserves 1, no. 1(57) (February 26, 2021): 12–16. http://dx.doi.org/10.15587/2706-5448.2021.225474.
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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
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Avery, Kenneth. "Design-build noise policy - what's fair?" INTER-NOISE and NOISE-CON Congress and Conference Proceedings 266, no. 2 (May 25, 2023): 890–98. http://dx.doi.org/10.3397/nc_2023_0100.
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The New York State Department of Transportation (NYSDOT) is implementing a design-build delivery process on projects involving noise barriers that requires design-builders to provide Final TNM design year with noise barrier noise levels that are equal to or less than the corresponding Preliminary TNM design year with noise barrier noise levels determined in the NEPA environmental document. The NYSDOTs first use of the design-build delivery method was the $3.9B New NY Bridge project implemented by the New York State Thruway Authority (NYSTA). That project included a significant investment in noise barriers on the Rockland Landing. The New NY Bridge (NNYB) project served as a test case at a time when a well-developed design-build noise policy did not exist. In the absence of a definitive design-build noise policy, the noise barriers originally offered by the design-builder, while providing significant noise reductions, failed to meet all the environmental commitments made to all benefitted receivers as documented in the Final Environmental Impact Statement and Record of Decision (FEIS/ROD). Working with FHWA and NYSDOT, the NYSTA reached agreement with the design-builder to construct noise barriers that provided the same future design year with noise barrier noise levels that were provided in the noise study that supported the FEIS/ROD. Since construction of the New NY
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Dasarathy, A. K., and M. Tamil selvi. "Noise Reduction Using Concrete Barriers: A Case Study." IOP Conference Series: Materials Science and Engineering 1197, no. 1 (November 1, 2021): 012010. http://dx.doi.org/10.1088/1757-899x/1197/1/012010.
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Abstract Noise pollution is becoming more and more acute, and hence many researchers are studying the noise attenuation effect and prevention of noise. In this study an attempt has been made to find the reduction in noise levels at National Highway 45 near peerkankaranai in Chennai. Two sensitive places were selected along NH 45 by examining attenuation of noise by providing noise barriers in the form of concrete structures. The primary goal of this project was to identify innovative design of noise barrier that has the potential to be implemented in NH 45, Chennai. Based on the research and evaluation conducted for this study, it was recommended that two innovative barrier designs be implemented in Chennai. First, a noise prediction is made at the specified location on the highway under certain traffic conditions in order to determine the noise level by measurement and decide on the barrier requirement. The installation of sound barriers is feasible enough to cause a significant decrease in noise pollution at the roads. Considerable noise attenuation is achieved by providing concrete noise barrier. The paper provides Leq at the time of traffic data recorded was 105.1 dBA at NH45 and 91.108 dBA at NH5 during the time of observation at installation of barrier the values are 70.09 dBA 79.11 dBA, respectively. Noise reduction is possible and noise reduction is predominantly reduced by providing barrier.
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Ross, Jason C., Mark Arnoldy, and Jonathan Evans. "New Hampshire Department of Transportation Statewide Noise Barrier Study." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 24 (September 18, 2018): 144–53. http://dx.doi.org/10.1177/0361198118797188.
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This paper presents the results of a statewide noise barrier study for the New Hampshire Department of Transportation (NHDOT). The feasibility and reasonableness of noise barriers throughout the state has been evaluated according to NHDOT acoustical and cost-effectiveness criteria. The study has provided the DOT with an estimate of the potential noise barrier material costs associated with a newly implemented Type II noise barrier program. The study also has identified municipalities that the DOT can coordinate with for enacting noise-compatible planning regulations. The paper describes the methodology used to develop the screening-level noise barrier evaluation. Highway noise levels throughout the state and the distances from the highway where noise levels exceed the noise abatement criteria were determined. A method to predict the noise reduction of barriers (insertion loss) based on a simple geometrical relationship of receptors and potential noise barriers was established and has been shown to correlate well to detailed traffic noise models using actual roadway and terrain geometry. The simplified prediction method was used to evaluate over 300 miles of highway, 300 candidate noise barrier study areas, and over 30,000 receptors. This screening-level modeling approach is critical to the practicality of using the Traffic Noise Model across the entire state given the significant number of receptors and noise barrier study areas. The results of the study including information about all 30,000 receptors and 300 noise barrier study areas were collected in Google Earth™ data files for easy access when the DOT responds to noise complaints from the public.
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Zannin, Paulo Henrique Trombetta, Eriberto Oliveira do Nascimento, Elaine Carvalho da Paz, and Felipe do Valle. "Application of Artificial Neural Networks for Noise Barrier Optimization." Environments 5, no. 12 (December 10, 2018): 135. http://dx.doi.org/10.3390/environments5120135.
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In the modern world, noise pollution continues to be a major problem that impairs people’s health, and road traffic is a primary contributor to noise emissions. This article describes an environmental impact study of the noise generated by the reconstruction of an urban section of a highway. Noise maps were calculated, and an environmental impact matrix was generated to determine the environmental impact of this reconstruction. The implementation of noise barriers was simulated based on these noise maps, and the effectiveness of the barriers was evaluated using Artificial Neural Networks (ANNs) combined with Design of Experiments (DoE). A functional variable significance analysis was then made for two parameters, namely, the coefficient of absorption of the barrier material and the barrier height. The aim was to determine the influence of these parameters on sound attenuation and on the formation of acoustic shadows. The results obtained from the ANNs and DoE were consistent in demonstrating that the absorption coefficient strongly influences the noise attenuation provided by noise barriers, while barrier height is correlated with the formation of larger areas of acoustic shadow. The environmental impact matrix also indicates that the existence of noise pollution has a negative effect on the environment, but that this impact can be reversed or minimized. The application of simulated noise barriers demonstrated that noise levels can be reduced to legally acceptable levels.
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Zhao, Caiyou, and Wang Ping. "Minimizing noise from metro viaduct railway lines by means of elastic mats and fully closed noise barriers." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 232, no. 6 (January 10, 2018): 1828–36. http://dx.doi.org/10.1177/0954409717752200.
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An adverse effect of urban elevated rail transit systems is the associated noise, which has become a source of environmental complaints. In order to effectively address this problem, an in situ experiment has been conducted on the elevated sections of Hangzhou Metro Line 1 involving three cases: a 2.2 m vertical noise barrier with integrated bed track, a 2.2 m vertical noise barrier with an elastic mat floating slab track, and a 5.1 m fully enclosed noise barrier with an elastic mat floating slab track. The noise reduction effects of the elastic mats and the two kinds of noise barriers for metro viaduct railway lines were evaluated, and the mechanisms of these countermeasures were analysed. The results show that elastic mats can effectively reduce the transmission of wheel–rail vibration energy into the bridge, thus decreasing bridge-borne noise; meanwhile, the elastic mats could lead to an increase in wheel–rail noise. An excellent noise reduction effect was achieved in the area below and near the bottom of the bridge, while an increased noise effect was observed close to the area above and near the rail surface. The fully enclosed noise barrier controlled the propagation of wheel–rail noise more effectively than the vertical noise barriers, but no difference was found between these two kinds of noise barriers in controlling bridge-borne noise.
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Alam, Pervez, Kafeel Ahmad, S. S. Afsar, and Nasim Akhtar. "3D noise mapping for preselected locations of urban area with and without noise barriers: A case study of Delhi, India." Noise Mapping 7, no. 1 (May 4, 2020): 74–83. http://dx.doi.org/10.1515/noise-2020-0006.
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AbstractNoise pollution has been rising as a critical issue in recent days particularly for the people living in urban areas. This study has been conducted to find out the effects of traffic induced noise on nearby residential building through 3D noise mapping with and without noise Barriers. Monitoring has been carried out at various densely populated preselected locations of Delhi, India. Thereafter, 3D noise mapping has been done using hourly average noise levels for the locations exposed with maximum noise. The developed 3D noise map shows the variation of noise level along X, Y and Z direction for all selected locations before and after installation of noise barriers. Moreover, the result also shows that exact assessment of noise impact is possible through 3D noise mapping, when a multistory building close to the source of noise is taken into consideration. This paper also elaborates the adequate height, distance and NRC value of noise barrier to reduce the effect of road traffic noise on nearby high rise building. Reduction pattern of noise level can easily be visualized and evaluated by using these maps. This type of study could support decision makers during adaptation of suitable remedial measures.
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Law, Harvey, Jenny Law, and Marek Kierzkowski. "Absorptive noise barrier development." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A351. http://dx.doi.org/10.1121/10.0023767.
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This paper reveals the development of an absorptive, self-supporting noise barrier panel for external applications. Designed for use as a temporary external noise barrier for construction sites and roadside noise barriers. The absorptive noise barrier panel is a module base design that is easy to assemble, disassemble, and re-deploy. The barrier panel utilizes recycled plastic materials, such as milk bottles and other soft plastics, making it one of the most environmentally friendly products. The barrier is manufactured in one process via a unique rotation molding method. It is weather resistant, aesthetically appealing, and offers great design flexibility. Standard size panels are 100 mm thick, by 2000 m wide x 500 mm high. The acoustic design is modeled to achieve NRC 0.85 at 100 mm thick based on an advanced air-flow resistive layer technique combined with an air cavity. The actual sound absorption measurement results are well in line with the predicted modeling. Such a case study potentially uncovers a whole new range of innovative absorptive noise barriers. Further studies and investigations are also recommended.
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Huang, Xian Feng, Chen Hui Zhu, and Quan Shi. "Analysis on Traffic Noise Attenuation by Using Sound Barrier." Applied Mechanics and Materials 584-586 (July 2014): 776–79. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.776.
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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.
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Choi, Sooyeon, Minsu Kim, and Sanghyun Choi. "Dynamic Effect Evaluation Method for Calculating Durability Performance of Railway Noise Barrier." Journal of the Korean Society of Hazard Mitigation 23, no. 2 (April 30, 2023): 73–79. http://dx.doi.org/10.9798/kosham.2023.23.2.73.
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The extension of the railway noise barrier, the construction of which began in the mid-1980s, has currently reached a total of 800 km. As the aging rate is expected to increase rapidly, maintenance through reasonable performance evaluation is required. In this study, a technique for evaluating the durability of railway noise barriers is proposed, considering the dynamic effect of train wind, which is generated when trains pass through noise barriers. The proposed method is based on the equivalent static load for the dynamic effect acting on the noise barrier, as presented in EN 16727-2-2, which considers the train speed, number of passages, length, height, natural frequency of the noise barrier, and distance from the center of the track in reviewing the dynamic effect; moreover, it calculates the durability performance using a performance rating matrix based on the number of trains passing per day and dynamic effects. It is expected that the proposed technique can be used to evaluate the performance of railway noise barriers according to the Railway Construction Act.
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Suh, Sanghoon, Vincent J. Badagnani, Luc Mongeau, and J. Stuart Bolton. "Performance of Noise Barriers with Absorptive Edge Treatments." Transportation Research Record: Journal of the Transportation Research Board 1859, no. 1 (January 2003): 53–64. http://dx.doi.org/10.3141/1859-07.
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The installation of sound-absorptive materials near the edge of a noise barrier is known to increase its insertion loss. First, scale-model experiments were performed to compare the performance of barriers that have absorptive edge linings with that of linearly extended, rigid uniform barriers and T-shaped barriers. The issue of effective positioning of the sound-absorptive material was also addressed. It was found that in terms of material use, an absorptive treatment was the most effective treatment for reducing the sound level in the shadow zone for a given barrier height. It was concluded that absorptive edge treatments may offer the opportunity to design effective treatments that could be retrofitted to existing barrier installations to improve their effectiveness. Preliminary field measurements were performed near South Bend, Indiana. The performance of an existing barrier was evaluated. Predictions of its performance made using the FHWA Traffic Noise Model were verified. An acoustical treatment was added to one vertical edge of the highway noise barrier. The results for the performance of the acoustical treatment measured in the field confirmed the trends of the scale-model laboratory measurements.
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Menounou, Penelope, Ilene J. Busch‐Vishniac, and David T. Blackstock. "Jagged‐edge noise barriers." Journal of the Acoustical Society of America 103, no. 5 (May 1998): 2759. http://dx.doi.org/10.1121/1.421452.
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D, Brugge, Ron S, Resiner E, Botana P, Leaffer D, Zamore W, Sprague Martinez L, and Keppard B. "Noise Barriers in Somerville." Environmental Epidemiology 3 (October 2019): 44. http://dx.doi.org/10.1097/01.ee9.0000606112.20445.82.
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Menounou, Penelope, and Ilene J. Busch-Vishniac. "Jagged Edge Noise Barriers." Building Acoustics 7, no. 3 (September 2000): 179–200. http://dx.doi.org/10.1260/1351010001501598.
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Crombie, D. H., D. C. Hothersall, and S. N. Chandler-Wilde. "Multiple-edge noise barriers." Applied Acoustics 44, no. 4 (1995): 353–67. http://dx.doi.org/10.1016/0003-682x(94)00032-q.
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Nordmann, Thomas, and Luzi Clavadetscher. "PV on noise barriers." Progress in Photovoltaics: Research and Applications 12, no. 6 (September 2004): 485–95. http://dx.doi.org/10.1002/pip.566.
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Wayson, Roger, John MacDonald, Ahmed EI-Assar, Win Lindeman, and Mariano Berrios. "Florida Noise Barrier Evaluation and Computer Model Validation." Transportation Research Record: Journal of the Transportation Research Board 1859, no. 1 (January 2003): 72–78. http://dx.doi.org/10.3141/1859-09.
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The results of a project that investigated the effectiveness of in situ noise barriers in Florida are presented. The prediction accuracy of the FHWA Traffic Noise Model (TNM) is compared with STAMINA 2.0 and 2.1 (Florida-specific). A total of 20 barrier sites were visited during a 3-year period that resulted in 844 discrete 20-min equivalent sound level (Leq) measurements behind the barriers. Barrier insertion loss was determined using the ANSI indirect barrier method. A methodology was developed to estimate shadow zone length created behind highway noise barriers. All of the barriers tested were effective (>5 dB:LAeq insertion loss at distances equivalent to the first row of homes, where LAeq is the A-weighted Leq) except one site because of marginal additional shielding from a berm–barrier combination. Only three sites had an insertion loss of less than 5 dB at distances representative of the second row of homes. Overall, measurements indicate that the barriers provide substantial sound level reduction for residents along the highway. TNM was the best prediction model when considering all test sites; however, the STAMINA models were more accurate at predicting source level. TNM predictions using the Average pavement input overpredicted the reference sound levels measured at these sites. TNM predictions using the OGAC (open-graded asphalt concrete) input were improved (under 2 dB:LAeq of error) over those using the Average pavement type input. This result is expected because Florida uses an open-graded asphalt friction mix.
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Džambas, Tamara, Saša Ahac, and Vesna Dragčević. "The Influence of Visibility Conditions in Horizontal Road Curves on the Efficiency of Noise Protection Barriers." Romanian Journal of Transport Infrastructure 2, no. 2 (December 1, 2013): 22–32. http://dx.doi.org/10.1515/rjti-2015-0016.
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Abstract Ensuring sufficient visibility on planned roads by sight distance testing is an integral part of every project, but problems with visibility can emerge when noise barriers are erected on existing roads. Namely, in order to provide sufficient noise protection, high noise barriers are often placed at minimum distance from the carriageway edge, and additional visibility testing in most cases is not carried out. Research described in this paper consists of stopping sight distance tests conducted by means of specialized road design software MX Road, and noise barrier optimization conducted by means of specialized noise prediction software LimA using static noise calculation method RLS 90. The aim of this research is to establish whether the required stopping sight distance on road sections where minimum design parameters are applied can be achieved if the noise barrier is placed at minimum distance from the carriageway edge, and to establish whether the optimized dimensions of planned noise protection barrier will change if the barrier is placed on larger distance from the noise source, which is, in this case, the existing road.
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Liu, Yan, Bing Yang, Xiao Pai Zhang, Zhi Fang Zhong, Hua Xin Dong, and Hua Yun Sun. "Test and Analysis of Noise Reduction Effect for Different Heights and Distances of Sound Barrier." Advanced Materials Research 243-249 (May 2011): 4447–50. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4447.
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Based on the comparative analysis on the low-noise road surface, noise reduction green belts, noise barriers and other noise reduction methods, the sound barrier is put forward as an important method for reducing the city road traffic noise. The noise reduction effects for different heights and different distances of the sound barrier are tested and analyzed through noise and vibration test and analysis system, the following conclusions can be drawn. At the same heights from the ground, the father the test points away from the noise barrier, the higher the sound pressure level will be; At the same distances from the sound barrier, the nearer the test points from the ground, the smaller the sound pressure level will be; All of the sound pressure level curves have basically the same variation trend and the main noise frequency band is from 160 to 1600Hz; In the high frequency range which is greater than 1600Hz, the sound pressure level decrease significantly, indicating that the sound barrier has better noise reduction effect for high frequency range. The results provide the basis for the design of the sound barriers.
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Astrauskas, Tomas, Pranas Baltrėnas, Tomas Januševičius, and Raimondas Grubliauskas. "Louvred Noise Barrier for Traffic Noise Reduction." Baltic Journal of Road and Bridge Engineering 16, no. 1 (March 29, 2021): 140–54. http://dx.doi.org/10.7250/bjrbe.2021-16.519.
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Environmental issues near roads become more and more important in our society daily life. One of the most critical environmental issues is traffic noise. The present paper study louvred noise barrier designed by authors. The louvred noise barrier provides sound attenuation while allowing airflow and sunlight through it. Since the airflow resistance of the barrier is low, it requires a shallow foundation compared to conventional noise barriers. The sound attenuation performance of the louvred noise barrier was tested experimentally in a sound transmission chamber. Airflow resistance simulated using a computational fluid dynamics model. The simulation and experimental study were done with different louvred noise barrier setup: change of louvre blade angle and sound-absorbing material thickness. The results showed potential for future development for the field testing. Sound attenuation was highest in 2500 Hz and 3150 Hz octave frequency bands. Depending on the louvred barrier setup, sound attenuation was up to 28 dB(A) in mentioned frequency bands. The equivalent sound pressure level reduced up to 17 dB(A). The results showed that an increase in the louvre blade angle increases sound attenuation and increases airflow resistance.
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Pei, Chun Ming, Jing Zhu Hu, Qing Fen Liao, Bao Quan Wan, and Shan Shan Liang. "Analysis of Sound Insulation of Substation Barrier." Advanced Materials Research 1070-1072 (December 2014): 1179–83. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1179.
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Substation noise pollution as one of the most important environmental problems has been paid more and more attention. A model of substation sound barrier is built in this paper. On the basis of the model, the effects of sound isolation of the barrier with different positions, different heights are analyzed. The setting of the sound barrier that can bring best sound insulation effect will be obtained from the simulation results. Moreover, as the substation control buildings can be seen as barriers, the analysis of the sound barrier attenuation can provide a certain basis for the layout of substation buildings, and the setting of noise reduction barriers for noise controlling.
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Kulkina, Valeriya, and Alexandr Komkin. "Study of acoustic characteristics of noise barriers." MATEC Web of Conferences 320 (2020): 00030. http://dx.doi.org/10.1051/matecconf/202032000030.
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The acoustic efficiency of noise barriers has been studied using the developed two-dimensional finite element model in the COMSOL Multiphysics software package. Numerical calculations of the semi-infinite barrier efficiency have been compared with calculations conducted by the Maekawa formula. The main attention has been paid to the influence of the underlying surface on barrier acoustic characteristics. The barrier acoustic efficiency depends on its height, the position of the noise source and on the calculation point above the underlying surface. This dependence has been presented in this research.
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Bugaru, Mihai, Ovidiu Vasile, and Marian Neagoe. "Recent Developments of Noise Attenuation Using Acoustic Barriers for a Specific Edge Geometry." Computation 9, no. 12 (December 2, 2021): 129. http://dx.doi.org/10.3390/computation9120129.
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The aim of this research is to provide a better prediction for noise attenuation using thin rigid barriers. In particular, the paper presents an analysis on four methods of computing the noise attenuation using acoustic barriers: Maekawa-Tatge formulation, Kurze and Anderson algorithm, Menounou formulation, and the general prediction method (GPM-ISO 9613). Accordingly, to improve the GPM, the prediction computation of noise attenuation was optimized for an acoustic barrier by considering new effects, such as attenuation due to geometrical divergence, ground absorption-reflections, and atmospheric absorption. The new method, modified GPM (MGPM), was tested for the optimization of an y-shape edge geometry of the noise barrier and a closed agreement with the experimental data was found in the published literature. The specific y-shape edge geometry of the noise barrier contributes to the attenuation due to the diffraction phenomena. This aspect is based on the Kirchhoff diffraction theory that contains the Huygens-Fresnel theory, which is applied to a semi-infinite acoustic barrier. The new method MGPM of predicting the noise attenuation using acoustic barriers takes into consideration the next phenomena: The effect of the relative position of the receiver, the effect of the proximity of the source or receiver to the midplane of the barrier, the effect of the proximity of the receiver to the shadow boundary, the effect of ground absorption-reflections, the effect of atmospheric absorption, and the meteorological effect due to downwind. The conclusion of the paper reveals the optimization of the method for computing the noise attenuation using acoustic barriers, including the necessary corrections for ISO-9613 and the Sound PLAN software, as well as the optimization on a case study of a specific geometry of the edge barrier.
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Zaets, Vitaly, and Dmytro Bida. "Influence of sound-absorping properties of noise protection barriers on road traffic participants." Technology audit and production reserves 6, no. 1(62) (December 8, 2021): 14–18. http://dx.doi.org/10.15587/2706-5448.2021.244597.
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The object of research is the sound field from linear sound sources between two parallel impedance noise barriers. The presence of barriers changes the structure of the sound field, as a result of which the sound pressure level in the area between the barriers increases. An increase in sound levels leads to both a decrease in the effectiveness of noise barriers and an increase in the negative impact on road users. One of the ways out of this situation is the construction of barriers with sound-absorbing properties. In this paper, the influence of the impedance properties of the barriers at the level of sound pressure in the area between the barriers is considered. The finite element method was chosen to calculate the sound field around the barrier. A computer model of a linear sound source with vertical sound-absorbing barriers on both sides of the source was built in the Comsol Multiphysics software environment. The sound absorption properties of the barrier were determined by the acoustic impedance of the face of the barrier. The sound fields were calculated in octave bands with geometric mean frequencies from 31 to 500 Hz. In addition, the parameters that were also analyzed were the distance between the barriers and their height. The solution of the problem made it possible to obtain a field of sound pressure levels around the barrier. Changeable simulation parameters made it possible to analyze a large number of situations of relative position of barriers and their heights encountered in engineering. Studies have shown that only at low frequencies and relatively small distances between barriers, the sound pressure level can increase significantly. However, it has also been shown that the use of sound-absorbing lining of noise barriers can reduce the sound pressure levels in the area between the barriers and improve the acoustic conditions for road users.
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Marková, Petra, Vítězslav Křivánek, Blanka Hablovičová, and Jindřich Frič. "EVALUATION OF NOISE ATTENUATION OF BARRIERS WITH GREENERY IN THE CZECH REPUBLIC." Akustika, VOLUME 40 (2021): 8–17. http://dx.doi.org/10.36336/akustika2021408.
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The article is focused on the measurements of different types of “environmental” built noise barriers (semi-vegetation, green belt, barriers with vegetation) which were measured in the different places in the Czech Republic. In situ measuring was carried out in accordance with the standard ISO 1996. Short-term synchronous measurements were carried out in front of and behind the noise barrier and the effectiveness of noise barriers was determined. The measurement results show a slight increase in acute attenuation in anti-noise elements using vegetation. During the growing season, when greening occurs, a more pronounced acoustic attenuation compared to dormancy has been clearly demonstrated. This research was supported by the Ministry of Transport of the Czech Republic.
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Sousa, Laura, Luís Pereira, David Montes-González, Denilson Ramos, Paulo Amado-Mendes, Juan Miguel Barrigón-Morillas, and Luís Godinho. "Experimental Analysis and Simulation of a Porous Absorbing Layer for Noise Barriers." Applied Sciences 13, no. 4 (February 18, 2023): 2638. http://dx.doi.org/10.3390/app13042638.
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Noise barriers are common noise mitigation measures usually implemented near roads or railways, with proven efficiency. This work presents a study of a porous concrete material incorporating expanded clay as aggregate, to be used on the sound-absorption layer of noise barriers. A theoretical material model is calibrated using experimental data and then used to estimate the diffuse field sound absorption from the normal incidence sound absorption estimation/measurement. Validation of such estimation is performed by comparing to reverberant room measurements. Numerical simulations are carried out using the boundary element method (BEM) and the CNOSSOS-EU calculation method to assess the performance of different types of barriers incorporating this material. L-shaped and vertical barriers are tested, as well as low-height and conventional (taller) barriers, employed in the context of a railway noise scenario. Different results are obtained by the two methods, mainly due to the different underlying physical principles. Good insertion loss values may be obtained using both conventional and low-height noise barriers together with the porous concrete material if a careful choice of its location within the barrier is made.
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Sohrabi, Shahin, Teresa Pàmies Gómez, and Jordi Romeu Garbí. "Suitability of Active Noise Barriers for Construction Sites." Applied Sciences 10, no. 18 (September 4, 2020): 6160. http://dx.doi.org/10.3390/app10186160.
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Barriers are increasingly used to protect the pedestrian and neighboring buildings from construction noise activities. This study aims to investigate the suitability of applying active noise control on barriers in a construction site to protect the street area and neighboring buildings. Transducers that are simulated in this work are close to the barrier, and their optimal positions are defined in such a way that the control system has the maximum performance at the neighboring areas close to the construction sites. To begin with, the suitable location of the control sources is found when the total squared pressure is minimized at the positions of noise receivers. The suitable location of the error sensors is, then, found when the control sources are fixed at the position of the previous step and the total squared pressure is minimized at the error sensors. The best location for the error sensors is defined when the maximum reduction is achieved in the target area. It is observed that suitable positions for the transducers depend on the location of target areas for noise control, the position of the noise source, and its operating frequency. In this investigation, a unique configuration is proposed for the transducers that achieves a comparable reduction both at the street area and the neighboring buildings, simultaneously. The results show that the active noise barrier with a height of 2.5 m can achieve an extra insertion loss in the street zone, varies from 9.3 to 16.4 dB (in comparison with passive noise barrier) when the distance of the noise source from the barrier changes in the range of 7 to 1 m, respectively. Those values are of the same order for the passive noise attenuation. Furthermore, similar results are achieved when attempting to cancel the shadow zone of a façade 15 m away from the barrier.
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Pultznerová, Alžbeta, Ján Šimo, and Juraj Grenčík. "Possibilities of Evaluating the Effectiveness of Noise Barriers in Slovakia." Applied Sciences 11, no. 21 (October 31, 2021): 10206. http://dx.doi.org/10.3390/app112110206.
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This paper presents environmental acute problems from increasing noise levels caused by automobile and rail transport. Noise barriers are considered to be an effective element in reducing noise in densely populated urban areas. However, do these barriers have the correct height, shape, material design, and construction? In the materials and methods, the basic characteristics of noise barrier, sound absorption, and sound insulation are described. Further, measurement methods of the insertion loss of outdoor noise barriers of all types using the direct and indirect method according to standard ISO 10847 and the Adrienne method according to standards EN 1793-5 and EN 1793-6 are presented. The measurement results of insertion loss of the selected noise barrier obtained by the indirect method showed a value of 19.1 dB(A) of insertion loss. This result was compared with simulation by our own software based on the CNOSSOS methodology, giving value of 19.6 dB(A), which is a good correlation. The Adrienne method was used for determination of the airborne sound insulation index of another noise barrier, giving a value of the single-number rating of the sound insulation of the barrier of 28 dB. In discussion, according to EN 1793-2, this value assigns an insulation index of category D3, which means that the barrier is high quality and has satisfactory airborne sound insulation. The advantages and disadvantages of both methods according to STN ISO 10847 and STN EN 1793-6 were discussed. We concluded that the main advantage of the method Adrienne—TN EN 1793-6 is that it can be used in situ under direct sound field conditions and can directly evaluate the sound insulation index of the whole barrier structure.
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Billera, Domenick, Richard D. Parsons, and Sharon A. Hetrick. "Good Fences Make Good Neighbors: Highway Noise Barriers and the Built Environment." Transportation Research Record: Journal of the Transportation Research Board 1601, no. 1 (January 1997): 55–63. http://dx.doi.org/10.3141/1601-09.
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Noise barriers have become a prominent feature on today’s landscape. Unfortunately, they have also become a feature associated with insensitivity toward the built environment. Designers could avoid the negative visual impact that noise barriers frequently create by increasing their awareness of aesthetics in the design process. In an effort to improve the quality of noise barrier design, the New Jersey Department of Transportation’s, Bureau of Environmental Analysis (BEA) altered the design process for its I-76/I-295 Type II noise abatement study. The first objective of the study was to acoustically engineer a barrier that would abate the noise for residents along the affected roadway corridor. The second was to develop an architectural design that would be aesthetically pleasing to the corridor resident and the roadway users. Typically, architects were brought into the design process at the end to review the aesthetic impact of the wall and add architectural features. On the I-76/I-295 project, BEA initiated a parallel process with the architectural design running concurrent with the engineering. The architectural design process and the interfacing of this process with the engineering are described. Community involvement was essential to the architectural objective of designing an aesthetically pleasing barrier. Ideas reflecting community concerns and comments were refined into final recommendations for construction of a noise barrier with gateways and a unifying corridor theme. The noise barrier should then become a representation of the community and stand as an icon in the built environment. Noise barriers can have a positive impact on the built environment if a commitment is made to aesthetics throughout the design process.
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Shashurin, Aleksandr, Nickolay Ivanov, Iuliia Rassoshenko, and Marat Goguadze. "ACOUSTIC RELIABILITY OF THE NOISE BARRIERS." Akustika 32 (March 1, 2019): 251–55. http://dx.doi.org/10.36336/akustika201932251.
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A large amount of regulatory and technical documentation, from state standards to guidelines governing the requirements for noise barrier design and location, has been currently developed in Russia. However, despite such an abundance of regulatory and technical documentation, it is extremely difficult to achieve compliance between the theoretical and practical noise barrier efficiency. According to the study, in the 3rd year of operation, 7 out of 10 noise barriers have already lost their original acoustic properties, the state of 50% of the NB can be estimated as ‘moderate’, 20% - as ‘bad’. Starting from the 8th year of operation, the condition of 50% of the NB is characterized as ‘moderate’, and 50% - as ‘bad’. It is necessary to adjust the regulatory and technical documentation taking into account the main issues and errors encountered in practice.
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Choy, Yat Sze, Wang Zhibo, and Yang Waiping. "Noise reduction of Parallel barrier integrated with compact flexible panel device." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 2961–72. http://dx.doi.org/10.3397/in-2021-2268.
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Erection of parallel barriers to control environmental noise such as traffic noise and construction noise is commonly seen in community. Owing to the formation of multiple reflection waves between the parallel barriers, their performance may be worse than a single barrier. To improve the performance of parallel barriers, a small piece of flush-mounted panels backed by a slender cavity in an otherwise rigid wall of barriers is proposed. With the excitation of the incident wave from a sound source inside parallel barriers, the flexible panel vibrates and sound is radiated out to undergo acoustics interference with sound field between the parallel barriers so that the sound intensity in this space and diffraction wave at the barrier top edge is reduced over a broadband in the low-frequency regime. The use of the panel provides flexibility in controlling range of stopband with high insertion loss by varying mass and bending stiffness. A semi-analytical model for dealing with vibroacoustic coupling between the open cavity and vibrating panel in a two-dimensional configuration is established in order to understand the sound suppression mechanism within the shadow zone. With the optimal structural properties of the panel, the extra averaged insertion loss of about 5dB in the frequencies ranging from 50 to 1000 Hz is reached for the parallel barrier.
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Pultznerová, Alžbeta, and Juraj Grenčík. "Investigation of the effect of a noise barrier on a railway track in the Kysuce region." MATEC Web of Conferences 313 (2020): 00035. http://dx.doi.org/10.1051/matecconf/202031300035.
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Purpose of the noise barriers is to create an acoustically sufficient impermeable obstacle located on the sound wave propagation path, thereby creating a shadow of the sound pressure level behind the barrier. The paper is focused on the analysis of measured noise values at specific selected points of the railway track in the region of Kysuce without noise barrier and on the determination of noise barrier efficiency. The observed values are compared with the permissible noise values specified by the Slovak legislation
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SATO, Daigo, and Akira OMOTO. "Noise prediction considering transmitted sound from noise barriers." Transactions of the JSME (in Japanese) 85, no. 879 (2019): 19–00239. http://dx.doi.org/10.1299/transjsme.19-00239.
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