Sound attenuation plate capable of absorbing noise and sound barrier with sound attenuation plate

Abstract

The invention discloses a sound attenuation plate capable of absorbing noise. The sound attenuation plate comprises a plate body. Sound attenuation holes are formed in the plate body and comprise sound wave inlets and sound wave outlets which are connected with the sound wave inlets and have large cross sections. The sound wave inlets are located in rims of the sound wave outlets. Sound wave baffles which are identical with the sound wave outlets in terms of shape and size are arranged at the sound wave outlets and arranged on the edges of the sound wave outlets through columns. When noise waves enter the sound wave inlets, the noise waves are compressed by the walls of the sound wave inlets. When the sound waves enter the sound wave outlets, the sound waves rapidly expand, the majority of the sound wave energy of noise is converted into heat energy, the rest of the noise waves are emitted from exit places of the sound wave outlets and encounter the sound wave baffles which are arranged by facing the sound wave outlets. The remaining sound waves are rebounded to the sound wave outlets and coincide with the rest of the noise sound waves emitted from the sound wave outlets. The sound waves which are identical with frequencies and adverse in phases are counteracted, so that the noise is thoroughly eliminated.

Description

technical field [0001] The invention relates to a device for eliminating urban traffic noise, in particular to a sound barrier for eliminating road noise by means of absorbing noise. Background technique [0002] With the development of road traffic and urban construction, the traffic flow is rapidly increasing and the driving speed is rapidly increasing, and the problem of traffic noise nuisance is becoming more and more serious. For unrenovated urban areas, residential buildings, hospitals, schools, and office buildings of scientific research institutions are close to urban traffic arterial roads, viaducts, and light rails. Residents are increasingly suffering chronic damage from road traffic noise. In view of this, some cities solve the problem by setting up sound barriers on both sides of the street. By setting up baffles perpendicular to the road surface on both sides of the road, it is used to prevent vehicle noise from radiating to the communities on both sides of the...

AI Technical Summary

Problems solved by technology

In view of this, some cities solve the problem by setting up sound barriers on both sides of the street. By setting up baffles perpendicular to the road surface on both sides of the road, it is used to prevent vehicle noise from radiating to the communities on both sides of the road. The engineering acoustic effect of the sound barrier is usually determined by The height of the sound barrier is determined. Due to the three-dimensional propagation of sound waves, part of the noise penetrates the sound barrier to the sound receiving point; part of the noise is diffracted across the top of the sound barrier to reach the sound receiving point. According to J.B.Keller's sound diffraction theory, the top of the sound barrier It is the part where the sound energy is concentrated. In this part, in addition to the direct sound from the sound source, the diffracted sound will also be transmitted to the other side of the sound barrier, and the upper edge of the sound barrier becomes a secondary noise source; there is also a part of the noise The multiple reflections on the walls of the sound barrier parallel to both sides reach the sound receiving point, especially in big cities, the high-rise buildings on both sides of the road form a "canyon effect", which also indirectly plays the role of reflecting noise, and the sound barrier cannot be designed as Infinitely high and infinitely long, so for sound receiving points that are closer to the road and higher floors, ordinary open sound barriers can only make part of the floors of tall buildings in the sound shadow area, and cannot significantly reduce traffic noise as a whole. Therefore, the noise reduction effect of the sound barrier is often not ideal.

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