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Can road sound barriers reduce noise pollution?
Published Time:
2021-02-24
Can road sound barriers reduce noise pollution?
In recent years, among various urban noises, the average level of urban road traffic noise is approximately 72dB. According to regulations, the environmental noise limit in general residential areas should not exceed 55 decibels during the day and 45 decibels at night. If noise pollution cannot be controlled, noise reduction is necessary. Sound barriers are a common noise reduction method.
Sound barriers mainly consist of steel structural columns and sound-absorbing screens. The columns are the main load-bearing components of the sound barrier, fixed to the pre-embedded steel plates on the road crash barrier or track side via bolts or welding; the sound-absorbing panels are the main sound insulation and absorption components, fixed in the H-shaped column slots via high-strength safety clamps, forming a sound barrier. Below are the environmental requirements for the installation site of road sound barriers.
Whether the sound source surface is too wide. Traffic noise is usually considered a linear sound source. Now, highways have four lanes, six lanes, eight lanes, or even twelve lanes. Such sound sources cannot be treated as linear sound sources. If the sound source surface is too wide, the noise components in contact with the sound barrier will be greatly reduced, and its sound insulation effect will also be greatly reduced.
Whether there are sound reflection surfaces around. If there are sound reflection surfaces in the surrounding environment, the design of the sound barrier will become very difficult. Since the noise reflected by the reflection surface will not contact the sound barrier, the noise reduction effect of the sound barrier will be greatly reduced. For example, installing sound barriers at the edge of city streets is not effective. Because the buildings on both sides of the street are reflective surfaces, the reflected sound greatly reduces the effectiveness of the sound barrier.
Between the sound source and the sound receiving point, piercing a board or wall with a data-intensive area density that meets the requirements, so that the sound wave propagation has a significant additional attenuation. This pierced third party is called a sound barrier, also known as a noise barrier, which is an important way to reduce traffic noise and can be used for noise reduction of highways, elevated composite roads, and other noise sources.
Any acoustic system has three main links: the sound source, the transmission method, and the receiver. When sound waves propagate and encounter a sound barrier, three phenomena occur: reflection, transmission, and diffraction. The sound barrier can block the straight-line propagation of sound, making the diffracted sound have satisfactory attenuation, while the influence on the propagation of sound can be ignored.
Keywords:
Sound insulation board
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