Sound Absorptive Tiles A set of home theater set up success or not, the most intuitive performance is the sound obtained. However, the sound is so good, in addition to the use of audio equipment itself, there are still equipment with the adjustment and the impact of space factors. In this one, the spatial factor is the most influential and the most difficult to overcome.
This requires us to set up a home theater before the room acoustic design and processing, to achieve several prerequisites: the necessary sound insulation, moderate absorption of sound and the full diffusion of sound. The use of sound-absorbing material in which play an important role in the appropriate sound absorption treatment,Sound Absorptive Tiles is conducive to get a good acoustic effect, the following we will for the type of sound-absorbing material and conventional acoustics to do some introduction.
First, sound-absorbing material
Sound-absorbing materials in the transformation of the home theater plays an important role in the appropriate sound absorption treatment, is conducive to get a good acoustic effect, the following we will sound object for the type and layout of a detailed discussion.
There are many kinds of sound absorbing materials and structures, which can be divided into porous materials, plate materials, perforated plates, shaped ceilings, film materials, flexible materials according to the appearance and tectonic characteristics of the materials. Can be broadly divided into three categories: porous sound-absorbing material, resonant sound absorption structure and special sound absorption structure.
1, porous sound-absorbing material
Sound Absorptive Tiles Porous sound-absorbing material works from the surface of the material to the inside of a large number of mutual through the pores, with the appropriate permeability, when the sound from the surface of the material open pores into the material inside the other microporous, The vibration of the air, the relative movement between the air and the solid tendons, due to the viscosity of the air in the pores by the viscous resistance, vibration of the air particles in the kinetic energy in the friction into heat, so that the sound energy attenuation; Adiabatic compression, the air particles and the hole between the continuous heat exchange, heat conduction will also make acoustic energy into heat.
Common porous sound-absorbing material is fibrous material, granular material, foam, curtain and so on.
A, fiber materials are divided into organic fiber materials and inorganic fiber materials. Organic fiber materials are felt, hemp fiber, seaweed, coconut silk and so on. Inorganic fiber materials are glass wool, slag cotton, glass wool with a small volume, low thermal conductivity, flame retardant, corrosion resistance, moisture and high sound absorption coefficient. Glass wool made of glass wool felt in the case of air is not easy to disperse the fiber,Sound Absorptive Tiles the material is more uniform, the use of the course of time is not easy due to heavy sinking, widely used and sound absorption structure and a variety of silencers, of course, Excellent sound absorbing material. Slag cotton (felt) sound absorption performance and glass wool (felt) similar to the construction should pay attention to labor protection, so as not to thorn and inhalation of the respiratory tract. Glass wool, slag cotton is widely used in acoustic engineering.
B, granular materials products are clay sound-absorbing bricks, expanded perlite, sound-absorbing panels, and so on.
C, foam mainly refers to the foam products, many of its types, are used to name the resin. Domestic often used polystyrene, polyvinyl chloride, PVC foam, but mostly closed-type, mainly for insulation and instrumentation electrical insulation packaging, can not be used for sound absorption; for sound only A small number of open-cell foam products, such as foam urea-formaldehyde plastic, flexible polyurethane foam and so on.
D, with a certain sound performance of the textile, from the wall or the window at a certain distance for the curtain, the equivalent of an air layer behind the porous sound-absorbing material, and thus, the high-frequency sound waves have a certain sound absorption effect.
2, resonance sound absorption structure
The sound absorption principle of the resonant sound absorption structure is based on the Helmholtz resonator. It is a closed interior for the hard surface of the container, through a small opening associated with the outside atmosphere. When the frequency of the incident sound wave and the natural frequency of the resonator, the opening of the air to produce intense vibration friction, strengthen the absorption effect, the formation of absorption peaks, the sound energy significantly attenuated; away from the natural frequency, the absorption of sound waves Significantly reduced. The actual use of the resonant sound absorption structure in the project is often made of perforated plate, slit plate and other forms, these plates installed at a distance from the wall or ceiling, as Helmholtz resonator combination. If the filling of the porous material at the back cavity increases the acoustic resistance,Sound Absorptive Tiles the absorption band of the structure is widened.
There is also known as a thin plate resonance sound absorption structure, the structure is three plywood, wood fiber board and other thin plate fixed to the wall or ceiling frame, behind a certain thickness of the air layer. When the incident sound waves on the role, it will stimulate the vibration, due to bending deformation of the plate, the plate friction will be mechanical energy into heat, resonance energy consumption when the largest. Thin plate resonant sound absorption structure for low frequency sound absorption, resonant frequency of more than 80 ~ 300Hz, sound absorption coefficient of about 0.2 to 0.5. When filling the porous sound-absorbing material in the air layer,Sound Absorptive Tiles especially the edge of the air layer, the sound absorption coefficient of the structure will increase, especially in the frequency range near the vibration frequency of the sheet.
3, special sound absorption structure
Special sound absorption structure of the common space between the body and the sound absorption of two wedge.
The former is hanging in the air of a variety of sound absorption structure, because of its effective sound absorption area is much larger than the projected area, according to the projected area of the sound absorption coefficient can be greater than 1, a wide absorption band, Sound effect is remarkable, get a wide range of applications.
Sound absorption wedge is applied to the special sound absorption structure of the anechoic chamber, in a certain frequency range, the indoor wall of the sound absorption coefficient of up to 99% or more.