Performance of Noise Barriers with Absorptive Edge Treatments

2003 ◽  
Vol 1859 (1) ◽  
pp. 53-64
Author(s):  
Sanghoon Suh ◽  
Vincent J. Badagnani ◽  
Luc Mongeau ◽  
J. Stuart Bolton
Keyword(s):  
Traffic Noise ◽  
Field Measurements ◽  
Sound Level ◽  
Noise Model ◽  
Scale Model ◽  
Vertical Edge ◽  
Laboratory Measurements ◽  
Shadow Zone ◽  
Noise Barriers ◽  
Noise Barrier

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.

Florida Noise Barrier Evaluation and Computer Model Validation

2003 ◽  
Vol 1859 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Roger Wayson ◽  
John MacDonald ◽  
Ahmed EI-Assar ◽  
Win Lindeman ◽  
Mariano Berrios
Keyword(s):  
Insertion Loss ◽  
Traffic Noise ◽  
Sound Level ◽  
Noise Model ◽  
Barrier Method ◽  
Noise Barriers ◽  
Zone Length ◽  
Sound Levels ◽  
Noise Barrier ◽  
Source Level

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.

New Hampshire Department of Transportation Statewide Noise Barrier Study

2018 ◽  
Vol 2672 (24) ◽  
pp. 144-153
Author(s):  
Jason C. Ross ◽  
Mark Arnoldy ◽  
Jonathan Evans
Keyword(s):  
New Hampshire ◽  
Traffic Noise ◽  
Google Earth ◽  
The State ◽  
Noise Model ◽  
Easy Access ◽  
Department Of Transportation ◽  
Noise Levels ◽  
Noise Barriers ◽  
Noise Barrier

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.

Perception of Traffic Noise Barrier Effectiveness: Public Opinion Survey of Residents Living near I-71

1997 ◽  
Vol 1601 (1) ◽  
pp. 49-54 ◽  
Author(s):  
Lloyd A. Herman ◽  
Michael A. Finney ◽  
Craig M. Clum ◽  
E.W. Pinckney
Keyword(s):  
Public Opinion ◽  
Traffic Noise ◽  
Department Of Transportation ◽  
Opinion Survey ◽  
Noise Barriers ◽  
Noise Abatement ◽  
Public Controversy ◽  
Public Opinion Survey ◽  
Project Area ◽  
Noise Barrier

The completion of the largest Ohio Department of Transportation traffic noise abatement project in 1995 was met with public controversy over the effectiveness of the noise barriers. A public opinion survey was designed to obtain the perceptions of the residents in the project area. In a departure from most surveys of traffic noise barrier effectiveness, the coverage was not limited to the first or second row of houses, but was extended to 800 m on each side of the roadway. It was found that the larger survey area was needed to avoid misleading conclusions. Overall perceptions of noise barrier effectiveness were found to vary with distance from the roadway and with noise barrier configuration.

Research of Different Noise Barriers Efficiency at Different Temperature

2017 ◽  
Author(s):  
Tomas Vilniškis ◽  
Tomas Januševicius
Keyword(s):  
Air Temperature ◽  
Noise Level ◽  
Structural Changes ◽  
Field Measurements ◽  
Sound Waves ◽  
Noise Barriers ◽  
Different Temperatures ◽  
Noise Measurements ◽  
Noise Barrier ◽  
Key Aspects

In this article was analyzed acoustic efficiency of two different construction noise barriers. Field measurements of noise tests were carried out before and behind a wooden barrier, which height was 2.9 meters and a wooden wall with equipped roof, which height was 3.2 m. As is known the length of the wall, height, surface roughness, shape and material of the wall – key aspects of determining the effectiveness of noise barrier. Different materials, depending on their characteristics of the hard or soft, porous or dense, interact differently with the sound of waves. Article contains research results of noise measurements at positive and negative air temperature. There analyzing wooden noise barrier acoustic efficiency at different temperatures and the effects of temperature to the diffraction of sound waves through the peak of the barrier. Test results show, that noise barrier without structural changes reduced noise level to 14–22 dB, noise barrier with structural changes reduced noise level to 20–23,1 dB, when air temperature was positive. When air temperature was negative, noise barrier without structural changes reduced noise level to 15,5–21,4 dB, noise level with structural changes to 19–26,6 dB.

Comparative Field Measurements of Tire Pavement Noise of Selected Texas Pavements

1998 ◽  
Vol 1626 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Michael T. Mcnerney ◽  
B.J. Landsberger ◽  
Tracy Turen ◽  
Albert Pandelides
Keyword(s):  
South Africa ◽  
Research Effort ◽  
Traffic Noise ◽  
Test Procedure ◽  
Field Measurements ◽  
Field Testing ◽  
The United States ◽  
Noise Barriers ◽  
Set Up ◽  
Pavement Noise

The effects of traffic noise are a serious concern in the United States and in the rest of the world. One significant component of traffic noise is tire-pavement interaction. If tire-pavement noise can be reduced at the source instead of through the use of traffic noise barriers set up to protect individual receivers, then potential savings can accrue. This research effort conducted field testing on 15 different pavement types found in Texas, and on six pavement types found in South Africa. A test procedure was developed with roadside microphones and microphones mounted on a test trailer to record and analyze the differences in tire-pavement noise. The test procedure was designed to develop comparisons of pavements while other variables were kept constant. The results, measured on the standard A-weighted scale, indicated for the 15 test pavements in Texas a difference of roadside noise levels of up to 7 dBA. Additionally, a roadside noise level of one pavement measured in South Africa was more than 2 dBA quieter than any Texas pavement.

scholarly journals Croatian Experience in Road Traffic Noise Management - Concrete Noise Barriers

2014 ◽  
Vol 3 (1) ◽  
pp. 1-11
Author(s):  
Saša Ahac ◽  
Ivo Haladin ◽  
Stjepan Lakušić ◽  
Vesna Dragčević
Keyword(s):  
Building Materials ◽  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Innovative Product ◽  
Noise Barriers ◽  
Waste Tyres ◽  
Noise Barrier ◽  
Recycled Waste ◽  
Absorptive Layer

Abstract The paper gives an overview of concrete noise barrier application in several EU countries and in Croatia. It describes a process of introducing different noise protection solutions on Croatian market in the phase of intensive motorway construction in recent years. Namely, an extensive motorway network has been constructed in Croatia in the last 10 years. Following the process of motorway construction, noise protection walls have also been erected. Usage of different building materials and installation processes as well as variations in building expenditures has led to a comparative analysis of several types of noise protection solutions (expanded clay, wood fibre) including a new eco-innovative product RUCONBAR, which incorporates rubber granules from recycled waste tyres to form a porous noise absorptive layer.

Determination of the Best Areas Behind the Noise Barriers with the Highest Performance by using a Mathematical Model

2020 ◽  
pp. 2150015
Author(s):  
M. R. Monazzam ◽  
N. Mansouri ◽  
Hamidreza Pouragha ◽  
Mahsa Naserpour
Keyword(s):  
Mathematical Model ◽  
Traffic Noise ◽  
Field Measurements ◽  
Noise Pollution ◽  
Center Frequency ◽  
Wide Field ◽  
Noise Barriers ◽  
Destructive Effect ◽  
Indirect Path ◽  
Noise Frequency

Traffic noise barriers are one of the most important ways of environmental noise pollution control. Profiled barriers are one of the most successful noise control screens. A simple mathematical model representation of the zones behind rigid and absorbent barriers with the highest insertion loss using the destructive effect of the indirect path via barrier image is introduced. The results are compared with the results of a verified two-dimensional (2D) BEM in a wide field behind those barriers. Field measurements for the model near a highway in a megacity were also tested. A very good agreement between the results has been achieved. In this method, effective height is used for any different profile barrier. Since the highway dominant noise frequency was found to be at 125 Hz 1/3-octave band center frequency, the presented model in this study showed that the best place for installing a T-shaped barrier is 10.5[Formula: see text]m from the target receiver. The introduced model is very simple and fast and could be used for choosing the best location of profiled barriers to achieve the highest performance with no additional cost.

Designing Roadside Noise Barrier

2018 ◽  
Vol 10 (2) ◽  
pp. 24-32
Author(s):  
Jason Obadiah
Keyword(s):  
Noise Source ◽  
Residential Area ◽  
Shadow Zone ◽  
Construction Sites ◽  
Noise Barriers ◽  
The Road ◽  
Sound Barrier ◽  
Additional Noise ◽  
Noise Barrier ◽  
The Common

Noise is the common problem in the residential area, whether it came from events, vehicles, construction sites, or urban area. The most affected residential area are usually the ones which adjacent to the highway or a road. When someone is overexposed from the noise, this could lead into many health problems. This is why a noise barrier is essential to be built along the road. problems regarding the noise barrier is that although the barrier can attenuates the noise from the traffic, there are other sound source, or in this case, noise source other than the traffic such as the airplane. This problem mostly happened on the residential ground around an airport. One of the solutions for these problems is by using vegetation as additional noise barriers. By doubling the barrier (noise barrier - vegetation) the attenuations will probably much higher, in accounts that the vegetation is much higher than the barrier so that if there are multiple floor buildings, the floors above will also provide with noise insulations. Although, it would be more appropriate to use acoustic treatments to the buildings. The other solution is that by using the concept of constructing a louver or cap atop the wall that is directed back toward the noise source. This concept follows the theory that such a design should inhibit shadow zone diffraction filling in sound behind the noise barrier. Keywords: noise, sound, barrier, attenuation

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.

Some Preliminary Results for Highway Noise Barrier Designs Based on Acoustic Band Gap Phenomenon

2008 ◽  
Author(s):  
Liang-Wu Cai
Keyword(s):  
Band Gap ◽  
Solid Wall ◽  
Traffic Noise ◽  
Wall Structure ◽  
Highway Traffic ◽  
Noise Barriers ◽  
Structural Requirement ◽  
Noise Shielding ◽  
Noise Barrier ◽  
Highway Noise

Noise is one of major annoyances in modern life. Studies have shown that the most pervasive sources of noise in our environment today are those associated with transportation, among which highway traffic noise is a dominant one. Traditional highway noise barriers are solid obstructions built along the sides of the highway, at an average cost of 1 million dollars per mile. In this paper, a new design was proposed, based on the phononic band gap phenomenon. The new design uses either a hollowed wall structure or an array of discrete columns in place of a solid wall. It is anticipated that such new designs will provide more effective noise shielding at the target frequency range, and yet reduces the structural requirement for the foundation support of the barrier wall. Preliminary simulation results are presented for a number of different configurations of the wall designs, and their relative advantages and shortcoming are compared.

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