scholarly journals Traffic Noise Mitigation Using Single and Double Barrier Caps of Different Shapes for an Extended Frequency Range

2020 ◽  
Vol 10 (17) ◽  
pp. 5746 ◽  
Author(s):  
Domingo Pardo-Quiles ◽  
José-Víctor Rodríguez ◽  
Jose-Maria Molina-García-Pardo ◽  
Leandro Juan-Llácer
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Noise Mitigation ◽  
Noise Barriers ◽  
Double Barrier ◽  
Noise Abatement ◽  
Extended Frequency ◽  
Different Shapes ◽  
The Aesthetic ◽  
Insertion Losses

The primary function of noise barriers is to shield inhabitants of affected areas from excessive noise generated by road traffic. To enhance the performance of noise barriers while simultaneously adhering to height restrictions, the attachment of structures (caps) of different shapes to the tops of conventional screens can be considered. These caps can significantly impact the diffracted sound energy, thereby increasing the desired global acoustic losses. This work presents a comprehensive study of the acoustic performance of noise barriers with single and double attached caps of different shapes through a calculation of their insertion losses (IL). This study comprehensively addresses and compares different types, sizes, combinations, and numbers of noise barrier caps for different scenarios (including sloping and absorbent grounds) and sources (“car” and “ambulance”) for an extended frequency band up to 10 kHz. To the best of the authors’ knowledge, this is a range that has not previously been analyzed. A variety of different cap shapes were considered including cylinders, rectangles, trapezoids, and Y/T-shaped forms. To calculate the IL, an innovative and fast uniform theory of diffraction (UTD)-based method developed by the authors was applied in all simulations. The results showed that the Y-shaped single and double barrier caps were, in general, the most effective at increasing IL without raising the height of the barrier, thereby successfully managing the aesthetic impact. The results also showed how the consideration of sloping and absorbent floors could also contribute to improved noise abatement.

scholarly journals Recent Developments in Sonic Crystals as Barriers for Road Traffic Noise Mitigation

Environments ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 14 ◽  
Author(s):  
Luca Fredianelli ◽  
Alessandro Del Pizzo ◽  
Gaetano Licitra
Keyword(s):  
Insertion Loss ◽  
Road Traffic ◽  
Traffic Noise ◽  
Porous Coating ◽  
Road Traffic Noise ◽  
Noise Mitigation ◽  
Noise Barriers ◽  
Continuous Growth ◽  
Sonic Crystal ◽  
Sonic Crystals

Noise barriers are the most widespread solution to mitigate noise produced by the continuous growth of vehicular traffic, thus reducing the large number of people exposed to it and avoiding unpleasant effects on health. However, conventional noise barriers present the well-known issues related to the diffraction at the edges which reduces the net insertion loss, to the reflection of sound energy in the opposite direction, and to the complaints of citizens due to the reduction of field of view, natural light, and air flow. In order to avoid these shortcomings and maximize noise abatement, recent research has moved toward the development of sonic crystals as noise barriers. A previous review found in the literature was focused on the theoretical aspects of the propagation of sound through crystals. The present work on the other hand reviews the latest studies concerning the practical application of sonic crystal as noise barriers, especially for road traffic noise mitigation. The paper explores and compares the latest developments reported in the scientific literature, focused on integrating Bragg’s law properties with other mitigation effects such as hollow scatterers, wooden or recycled materials, or porous coating. These solutions could increase the insertion loss and frequency band gap, while inserting the noise mitigation action in a green and circular economy. The pros and cons of sonic crystal barriers will also be discussed, with the aim of finding the best solution that is actually viable, as well as stimulating future research on the aspects requiring improvement.

scholarly journals Value for Money in Road Traffic Noise Abatement

2012 ◽  
Vol 48 ◽  
pp. 1366-1374 ◽  
Author(s):  
Ingunn Milford ◽  
Sigve J. Aasebo ◽  
Kjell Strommer
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Value For Money ◽  
Noise Abatement

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.

Road traffic noise barriers based on recycled materials.

2010 ◽  
Vol 128 (4) ◽  
pp. 2366-2366
Author(s):  
Jesus Alba ◽  
Romina del Rey ◽  
Jaime Ramis
Keyword(s):  
Road Traffic ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Noise Barriers ◽  
Recycled Materials

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.

scholarly journals Exploiting ground effects for surface transport noise abatement

Noise Mapping ◽  
2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Keith Attenborough ◽  
Imran Bashir ◽  
Shahram Taherzadeh
Keyword(s):  
Noise Reduction ◽  
Traffic Noise ◽  
Square Lattice ◽  
Artificial Roughness ◽  
Noise Mitigation ◽  
Noise Abatement ◽  
Surface Transport ◽  
Lattice Design ◽  
Parallel Wall ◽  
Ground Effects

AbstractGrowing demand on transportation, road and railway networks has increased the risk of annoyance from these sources and the need to optimise noise mitigation. The potential traffic noise reduction arising from use of acoustically-soft surfaces and artificial roughness (0.3 m high or less) is explored through laboratory experiments, outdoor measurements at short and medium ranges and predictions. Although the applicability of ground treatments depends on the space usable for the noise abatement and the receiver position, replacing acousticallyhard ground by acoustically-soft ground without or with crops and introducing artificial roughness configurations could achieve noise reduction along surface transport corridors without breaking line of sight between source and receiver, thereby proving useful alternatives to noise barriers. A particularly successful roughness design has the form of a square lattice which is found to offer a similar insertion loss to regularly-spaced parallel wall arrays of the same height but twice the width. The lattice design has less dependence on azimuthal source-receiver angle than parallel wall configurations.

Sign in / Sign up

Export Citation Format

Share Document