Design and application of sound barriers

Release time：2022-05-04    Click：15

A sound barrier, a specially designed acoustic baffle between a noise source and a protected object, is usually designed for a specific noise source and a specific protected object. For example, in traffic noise control, sound barriers, buildings, high slopes, embankments and other tall shelters can be used to reduce the impact of railroad and highway noise on people on both sides of the road; in industrial noise control, sound barriers can be used to reduce the noise of certain strong noise sources that are mainly high-frequency and cannot be completely closed by the use of closure measures, andise reduction is 5-10 dB(A).

In an unabsorbed studio, the insertion loss in the 1000 Hz octave band can be greater than 5 dB when the distance between the source and receiver is less than three times the height of the room, through a sound barrier that is greater than half the height of the room. 

When other noise control measures are not feasible, sound barriers and room ceilings, walls, sound-absorbing treatment is an effective combination of measures. 

When using indoor sound barriers, in addition to measuring the frequency spectrum and sound field distribution of the intensity of the indoor sound source, it is also necessary to decide whether or not to carry out sound-absorbing treatment according to the size of the indoor sound-absorbing capacity and noise reduction requirements, and finally consider the structure of the sound barrier and its dimensions.

Indoor sound barriers are generally chosen to be light structures with sound insulation greater than 20dB, for example, a single layer of 0.8-1mm-thick thin gold plate coated with 2-5mm-thick damping material, and then sound-absorbing treatment can be done on both sides. The height of the sound barrier should be higher than that of the machinery and equipment, but also higher than the human ear. Its shape can be made into a fixed type or into a screen type with rubber wheels at the bottom of the screen for moving and combining as needed. Reasonable use of indoor sound barriers, so that the noise of the workers near the machines and equipment operating areas to reduce the noise by 5-10dB is possible.