Now with the continuous development of society, noise has become one of the main environmental pollution factors, so now the building sound environment problem more and more attention and attention, choose appropriate sound absorbing board for building sound absorption treatment is the most commonly used building noise control engineering one of the most basic technical measures.
The difference between material sound absorption and material sound insulation is that the sound absorption of the material focuses on the size of the reverse sound energy on the side of the sound source, and the goal is to reflect the sound energy less. Material sound insulation looks at the size of the transmission sound energy on the other side of the incident sound source, and the target is to make the transmission sound energy smaller. Sound absorption material to the incidence of sound energy of the absorption, generally only a few ten, therefore, its sound absorption ability namely sound absorption coefficient can be expressed in a decimal and sound insulation material.
The transmitted sound energy can be attenuated to 10-3 ~ 10-4 of the incident sound energy or less. For the convenience of expression, the sound insulation volume is represented by the decibel measurement method. The two materials in the material difference is absorbing material of incident sound energy reflection is very small, which means that the sound energy is easy to enter and through the material: you can imagine, the material of the material should be porous sulfur and breathable, this is a typical porous sound absorption material, it is usually with fiber, pull or foaming material to form porous structure: its structure is: material has a large number of, interconnected, from the table to the hole, which has a certain permeability, when the sound wave into the porous material surface, cause the air in the vibration, due to the friction and air sticky
The static resistance and heat conduction convert a considerable part of the sound energy into heat energy, thus playing sound absorption. For sound insulation material, to weaken the transmission of sound energy, block the spread of sound, is not as porous as sound absorption material, porous, breathable, on the contrary, its material should be heavy and dense, such as steel plate, lead plate, brick wall and other materials. The requirement of sound insulation material material is dense without pores or gaps: there is a large weight, because this kind of sound material is dense, it is difficult to absorb and pass through the sound energy and reflect from although, so its sound absorption performance is not good.
In engineering, the goal and emphasis of the sound absorption processing and sound insulation processing are different. The goal of the sound absorption treatment is to reduce the repeated reflection of the sound, that is, to reduce the mixing time of the noise, and the continuous noise is reduced in the reduction of the indoor noise level, which is in the same building space of the sound source and the sound absorbing material. And for the sound coming from the adjacent room, the sound absorption material also plays an absorption role, which is equivalent to improving the sound insulation volume of the envelope structure.
Post time: May-23-2023