1. What are the wall sound-absorbing materials?
Wood sound-absorbing board, wood wool sound-absorbing board, fabric sound-absorbing board, polyester fiber sound-absorbing board, etc. Widely used in concert halls, theaters, recording studios, studios, monitoring rooms, conference rooms, gymnasiums, exhibition halls, dance halls, KTV rooms and other public places. These places need good sound insulation effect, which can absorb noise well and prevent the strong reflection of indoor sound from affecting the indoor environment.
The phenomenon that sound waves attenuate sound energy in the process of medium propagation is called sound absorption, and the decorative materials that can cause this phenomenon are sound absorption materials. Sound-absorbing materials are generally divided into: A porous sound-absorbing materials, B*** vibration sound-absorbing structures and C special sound-absorbing structures. These forms of sound-absorbing materials can be used on walls, but attention should be paid to fire prevention and environmental protection. Fiber sound-absorbing board, wood sound-absorbing board, soft bag, sound absorber, sponge sound-absorbing component, etc. They are all available in the market, so there are quite a few sound-absorbing materials to choose from.
Wood sound-absorbing boards are divided into slotted wood sound-absorbing boards and perforated wood sound-absorbing boards. Grooved wood sound-absorbing board is a kind of slit vibration-absorbing material with grooves on the front and perforations on the back. Perforated wood sound-absorbing board is a kind of structural sound-absorbing material with round holes on the front and back of MDF. Fabric sound-absorbing board is made by putting the non-combustible special sound-absorbing surface treated with micropores in a plastic or wooden frame and wrapping it with fire-proof sound-absorbing cloth, which has the characteristics of being difficult to prevent fire, free from dust pollution, strong in decoration and simple in construction. Its sound absorption spectrum is high, and it has good sound absorption effect on high, medium and low noise, so it is suitable for many public occasions.
Second, can wall sound-absorbing materials really remove noise?
Let's look at the sound absorption principle on the wall. Generally speaking, porous sound-absorbing materials mainly absorb medium and high frequency sound energy. The main sound absorption mechanism of sound-absorbing materials is that when sound waves are incident on the surface of porous materials, the air in their micropores is excited to vibrate, so that the kinetic energy of air is continuously converted into heat energy, thus attenuating the sound energy; In addition, when air is adiabatic compressed, there will be continuous heat exchange between air and hole wall, and acoustic energy will be converted into heat energy and attenuated.
Sound originates from the vibration of objects, causing the vibration of adjacent air to form sound waves, which spread everywhere in the air medium. When sound is introduced into the surface of the component material, part of the sound energy is reflected, part of it penetrates the material, and part of it is converted into heat energy due to the vibration of the component material or the friction with the surrounding medium when the sound propagates in it, that is to say, the sound is usually absorbed by the material. The principle is actually very simple.
With regard to wall sound-absorbing materials, this paper introduces several common materials in detail. For example, porous sound-absorbing materials, vibration sound-absorbing structures and special sound-absorbing structures can all play the role of sound absorption. The sound absorption principle of these special wall materials is to block the noise from outside the wall through the sound wave reflection principle. For example, many meeting rooms and entertainment places will use these sound-absorbing materials on a large scale to facilitate themselves and others.