What is the Advantage and Disadvantage of Noise Barrier Panel

Exterior structure on infrastructure used to prevent loud sounds from escaping

Please visit our website for more information on this topic.

The sound tube in Melbourne, Australia, designed to reduce roadway noise without detracting from the area's aesthetics.

A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution. Noise barriers are the most effective method of mitigating roadway, railway, and industrial noise sources &#; other than cessation of the source activity or use of source controls.

In the case of surface transportation noise, other methods of reducing the source noise intensity include encouraging the use of hybrid and electric vehicles, improving automobile aerodynamics and tire design, and choosing low-noise paving material. Extensive use of noise barriers began in the United States after noise regulations were introduced in the early s.

History

[

edit

]

Noise barriers have been built in the United States since the mid-twentieth century, when vehicular traffic burgeoned. I-680 in Milpitas, California was the first noise barrier.[1] In the late s, analytic acoustical technology emerged to mathematically evaluate the efficacy of a noise barrier design adjacent to a specific roadway. By the s, noise barriers that included use of transparent materials were being designed in Denmark and other western European countries.[2]

Acoustical scientist measures sound in noise barrier design study, Santa Clara County, California.

The best of these early computer models considered the effects of roadway geometry, topography, vehicle volumes, vehicle speeds, truck mix, road surface type, and micro-meteorology. Several U.S. research groups developed variations of the computer modeling techniques: Caltrans Headquarters in Sacramento, California; the ESL Inc. group in Sunnyvale, California; the Bolt, Beranek and Newman[3] group in Cambridge, Massachusetts, and a research team at the University of Florida. Possibly the earliest published work that scientifically designed a specific noise barrier was the study for the Foothill Expressway in Los Altos, California.[4]

Numerous case studies across the U.S. soon addressed dozens of different existing and planned highways. Most were commissioned by state highway departments and conducted by one of the four research groups mentioned above. The U.S. National Environmental Policy Act, enacted in , effectively mandated the quantitative analysis of noise pollution from every Federal-Aid Highway Act Project in the country, propelling noise barrier model development and application. With passage of the Noise Control Act of ,[5] demand for noise barrier design soared from a host of noise regulation spinoff.

By the late s, more than a dozen research groups in the U.S. were applying similar computer modeling technology and addressing at least 200 different locations for noise barriers each year. As of , this technology is considered a standard in the evaluation of noise pollution from highways. The nature and accuracy of the computer models used is nearly identical to the original s versions of the technology.

Small and purposeful gaps exist in most noise barriers to allow firefighters to access nearby fire hydrants and pull through fire hoses, which are usually denoted by a sign indicating the nearest cross street, and a pictogram of a fire hydrant, though some hydrant gaps channel the hoses through small culvert channels beneath the wall.

Design

[

edit

]

The acoustical science of noise barrier design is based upon treating an airway or railway as a line source.[dubious &#; discuss] The theory is based upon blockage of sound ray travel toward a particular receptor; however, diffraction of sound must be addressed. Sound waves bend (downward) when they pass an edge, such as the apex of a noise barrier. Barriers that block line of sight of a highway or other source will therefore block more sound.[6] Further complicating matters is the phenomenon of refraction, the bending of sound rays in the presence of an inhomogeneous atmosphere. Wind shear and thermocline produce such inhomogeneities. The sound sources modeled must include engine noise, tire noise, and aerodynamic noise, all of which vary by vehicle type and speed.

The noise barrier may be constructed on private land, on a public right-of-way, or on other public land. Because sound levels are measured using a logarithmic scale, a reduction of nine decibels is equivalent to elimination of approximately 86 percent of the unwanted sound power.

Materials

[

edit

]

Several different materials may be used for sound barriers, including masonry, earthwork (such as earth berm), steel, concrete, wood, plastics, insulating wool, or composites.[7] Walls that are made of absorptive material mitigate sound differently than hard surfaces.[8] It is also possible to make noise barriers with active materials such as solar photovoltaic panels to generate electricity while also reducing traffic noise.[9][10][11]

A wall with porous surface material and sound-dampening content material can be absorptive where little or no noise is reflected back towards the source or elsewhere. Hard surfaces such as masonry or concrete are considered to be reflective where most of the noise is reflected back towards the noise source and beyond.[12]

Noise barriers can be effective tools for noise pollution abatement, but certain locations and topographies are not suitable for use of noise barriers. Cost and aesthetics also play a role in the choice of noise barriers. In some cases, a roadway is surrounded by a noise abatement structure or dug into a tunnel using the cut-and-cover method.

Disadvantages

[

edit

]

Potential disadvantages of noise barriers include:

• Blocked vision for motorists and rail passengers. Glass elements in noise screens can reduce visual obstruction, but require regular cleaning
• Aesthetic impact on land- and townscape
• An expanded target for graffiti, unsanctioned guerilla advertising, and vandalism
• Creation of spaces hidden from view and social control (e.g. at railway stations)
• Possibility of bird&#;window collisions for large and clear barriers

• Noise abatement walls often block rail passengers' or road users' view and attract graffiti.

• This noise abatement wall in the Netherlands has a transparent section at the driver's eye-level to reduce the visual impact for road users.

• Low walls close to the track avoid optical impact.

Effects on air pollution

[

edit

]

Roadside noise barriers have been shown to reduce the near-road air pollution concentration levels. Within 15&#;50 m from the roadside, air pollution concentration levels at the lee side of the noise barriers may be reduced by up to 50% compared to open road values.[13]

You will get efficient and thoughtful service from JINBIAO.

Noise barriers force the pollution plumes coming from the road to move up and over the barrier creating the effect of an elevated source and enhancing vertical dispersion of the plume. The deceleration and the deflection of the initial flow by the noise barrier force the plume to disperse horizontally. A highly turbulent shear zone characterized by slow velocities and a re-circulation cavity is created in the lee of the barrier which further enhances the dispersion; this mixes ambient air with the pollutants downwind behind the barrier.[14]

See also

[

edit

]

References

[

edit

]

• Noise barriers at Wikimedia Commons

Noise pollution is a growing concern in urban environments, where the constant hum of traffic, construction, and industrial activities can significantly impact the quality of life. To combat this, sound barriers are often used to block or reduce noise levels in affected areas. These barriers come in various types, each with its own set of advantages and disadvantages. Choosing the right type of sound barrier depends on factors such as the specific noise issue, budget, and aesthetic preferences.

Let&#;s explore the pros and cons of different types of sound barriers to help you make an informed decision.

Acoustic Panel Sound Barriers

Acoustic panels are specially designed barriers that absorb sound rather than simply blocking it. Made from materials like fibreglass, foam, or specialised composites, these panels are used in a variety of settings, including both indoor and outdoor environments. They are particularly effective in reducing noise in complex sound environments.

Pros:

• Superior Noise Absorption: Acoustic panels are designed to absorb sound waves, making them highly effective at reducing noise levels.
• Customisation Options: These panels can be tailored in size, shape, and colour to suit specific needs and aesthetic preferences.
• Versatile Application: Acoustic panels can be used in various environments, from industrial sites to residential areas, and even indoors.

Cons:

• Higher Costs: Acoustic panels can be more expensive than other types of barriers, especially when high-performance materials are used.
• Maintenance Requirements: Depending on the material, these panels may need regular maintenance to remain effective, particularly in outdoor settings.
• Limited Blocking Ability: While they excel at absorbing noise, acoustic panels may not block sound as effectively as solid barriers like concrete or metal.

Concrete Sound Barriers

Concrete sound barriers are solid, dense structures typically used to block noise from highways, railways, and industrial areas. Made from reinforced concrete, these barriers are known for their strength and durability. They are often constructed in large panels or blocks, forming a continuous wall that effectively deflects and reduces noise.

Pros:

• Exceptional Noise Reduction: Concrete density allows it to significantly reduce noise levels, making it one of the most effective materials for sound barriers.
• Durability: Concrete barriers are highly durable, and resistant to weather, impact, and wear, ensuring a long lifespan with minimal maintenance.
• Security Enhancement: Besides noise reduction, concrete barriers also provide a strong physical barrier, enhancing security in high-risk areas.

Cons:

• High Installation Costs: The cost of materials and the need for specialised equipment make concrete barriers expensive to install.
• Aesthetic Impact: Concrete barriers can be visually imposing and may not blend well with natural or residential environments.
• Lack of Flexibility: Once installed, concrete barriers are difficult to modify or relocate, limiting their adaptability.

Wooden Sound Barriers

Wooden sound barriers are typically constructed from treated timber, and arranged in overlapping panels or slats. These barriers are commonly used in residential areas or along rural roads, where a natural aesthetic is desired. They can vary in height and thickness depending on the level of noise reduction required.

Pros:

• Natural Appearance: Wooden barriers blend seamlessly with natural landscapes and residential settings, offering a warm and attractive look.
• Moderate Noise Reduction: While not as dense as concrete, wood still reduces noise, especially in layered designs.
• Sustainability: Wood is a renewable resource, and when sourced sustainably, it offers an environmentally friendly option.

Cons:

• Ongoing Maintenance: Wood requires regular maintenance to prevent rot, warping, and insect damage, increasing long-term costs.
• Lower Durability: Compared to other materials, wood is less durable and can degrade over time, especially in harsh weather conditions.
• Fire Risk: Wooden barriers are flammable, which can be a concern in areas prone to wildfires.

Metal Sound Barriers

Metal sound barriers, often made from materials like steel or aluminium, are designed to block or deflect noise. These barriers are typically lightweight and can be constructed in various forms, including solid panels or perforated sheets that incorporate sound-absorbing cores. Metal barriers are commonly used in both industrial and residential settings.

Pros:

• Ease of Installation: Metal barriers are lighter than concrete, making them easier and quicker to install, with the added benefit of flexibility for relocation or adjustment.
• Good Noise Reduction: When combined with sound-absorbing materials, metal barriers can effectively reduce noise levels.
• High Durability: Metals like steel and aluminium are resistant to pests, rot, and weathering, offering a long lifespan with minimal maintenance.

Cons:

• Industrial Appearance: Metal barriers can appear industrial, which may not be suitable for all environments, particularly in residential or scenic areas.
• Heat Retention: Metal surfaces can retain and reflect heat, potentially creating hot spots in warm climates.
• Corrosion Potential: In certain environments, metal barriers may be prone to rust, requiring protective coatings or maintenance.

Vegetative or Green Sound Barriers

Vegetative or green sound barriers consist of dense vegetation such as trees, shrubs, or specially designed green walls. These barriers are used to block and absorb sound while enhancing the environment with greenery. They are often employed in urban areas, parks, and residential zones where aesthetic and environmental benefits are a priority.

Pros:

• Environmental Benefits: Green barriers improve air quality, provide habitats for wildlife, and contribute to the reduction of urban heat islands.
• Aesthetic Appeal: These barriers offer a natural and attractive look, blending well with landscapes and enhancing the visual environment.
• Noise Absorption: Dense vegetation can absorb sound, reducing noise levels effectively in certain conditions.

Cons:

• High Maintenance Needs: Vegetative barriers require regular upkeep, including watering, pruning, and pest control, which can be time-consuming and costly.
• Time to Maturity: It can take years for vegetation to grow to a level where it provides effective noise reduction.
• Variable Effectiveness: The noise-reducing effectiveness of green barriers can vary depending on the type and density of vegetation used.

Transparent Sound Barriers

Transparent sound barriers are made from materials such as acrylic or polycarbonate, allowing them to block noise while preserving visibility and light. These barriers are often used in urban areas, along scenic roads, or in residential settings where maintaining views or natural light is important.

Pros:

• Preservation of Views: Transparent barriers allow light and visibility to pass through, making them ideal for areas where preserving the view or natural light is a priority.
• Minimal Visual Impact: These barriers are less obtrusive than solid walls, blending into their surroundings and reducing their visual footprint.
• Effective Noise Reduction: Transparent barriers can provide significant noise reduction while maintaining an open and light-filled environment.

Cons:

• Higher Expense: The specialised materials used in transparent barriers can make them more expensive than traditional barriers.
• Maintenance Needs: Transparent barriers require regular cleaning to prevent dirt, smudges, or clouding, which can reduce their transparency over time.
• Potential Durability Issues: Transparent materials may be more prone to scratching, cracking, or weathering compared to more robust materials like concrete or metal.

Conclusion

Selecting the right sound barrier involves weighing the pros and cons of each type against your specific needs and environmental factors. Whether you&#;re looking for maximum noise reduction, aesthetic appeal, or environmental benefits, understanding the strengths and limitations of concrete, wood, metal, vegetative, acoustic, and transparent barriers will guide you to the most effective solution for your project.

Each barrier type has its unique place in mitigating noise pollution, and the best choice will depend on your priorities and the characteristics of the area where it will be installed.

Hebei Jinbiao is a leading company in Noise Barrier products and Fencing products in Singapore. We guarantee to provide you with the most high-quality Sound Barrier and Fencing products along with our dedicated assistance. Do not hesitate to contact us. We are looking forward to helping you solve your noise issues, safety issues and protecting you from noise pollution as well as ensuring your safety.

Want more information on Noise Barrier Panel? Feel free to contact us.