A facility is inserted between the sound source and the receiver to make the sound wave propagate with a significant additional attenuation, thereby reducing the effect of noise in a certain area where the receiver is located. Such a facility is called a Noise Barrier. Noise Barrier is divided into traffic noise barriers, equipment noise attenuation noise barriers, industrial plant noise barriers, and Road Noise Barrier is the place that uses most types of noise barriers.
If the Road Noise Barrier is constructed to protect an area of 100m, the Road Noise Barrier should be built 100m long, but the noise reduction effect of the end is greatly reduced. In order to avoid the end effect from affecting the noise reduction effect of the Road Noise Barrier, it should be designed There is a reasonable rule for the length of the Road Noise Barrier.
Many Road Noise Barriers in China now have end effect problems. Then you can calculate the installation length of the Road Noise Barrier according to the "15-degree angle determination method".
Road Noise Barrier construction "15-degree included angle determination method" Assuming that the length of the protected object is L, and the vertical distance from the Road Noise Barrier is A, then the distance between the Road Noise Barrier and the eyes of the protected object is L', Then the angle between the end of the protected object and the end of the Road Noise Barrier and L'is α. According to engineering practice α=15°: Confirm the construction location of Road Noise Barrier, determine the shadow area through infrared auxiliary equipment, and determine the installation length in the shadow area according to the noise reduction range.
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