Sound Insulation Material Sound Insulation Principle

The effect of acoustic insulation materials is well-known, and many people don't know the principle of sound insulation of acoustic insulation materials. Acoustic insulation supplier will explain the sound insulation principle and application of sound insulation materials.

First of all, let's take a look at what exactly is a sound insulation material?

The so-called sound insulation material refers to the material that can insulate, cut off and separate sound or noise and vibration sound. This material is called sound insulation material.

Because many places where people live have a certain degree of noise that affects normal life, it is necessary to have sound insulation materials to maintain people's normal life.

How do sound insulation materials work?

The amount of sound insulation follows the principle of the law of quality, that is, the greater the unit density of the sound insulation material, the greater the amount of sound insulation, and the area density is proportional to the amount of sound insulation.

The sound insulation material is physically elastic, and when sound waves are incident, it will excite vibration to propagate in the barrier. When the sound wave is not incident perpendicularly, but incident at an angle θ with the barrier, the sound wave front reaches the barrier surface in turn, and the sound wave arriving at the barrier first excites the flexural vibration wave in the barrier to propagate laterally along the barrier. When the propagation speed is the same as the traveling speed of the sound wave in the air gradually reaching the surface of the barrier, the sound wave will strengthen the vibration of the bending wave. This phenomenon is called the coincidence effect. At this time, the amplitude of the bending wave vibration is particularly large, and the energy of the sound wave radiated into the air on the other side is also particularly large, thereby reducing the sound insulation effect.

There are many kinds of sound insulation materials. The common ones are: building sound insulation materials, KTV sound insulation materials, decoration sound insulation materials, sound insulation and vibration reduction materials, shock absorption materials, sound absorption decoration materials, decorative sound absorption cotton panels, sound acoustical boards, and acoustic insulation, etc.

Common specifications and thickness: 2.0mm type sound insulation material, 4.0mm type sound insulation material, 1.2 type sound insulation material, etc.

The characteristics of sound insulation materials: there are many kinds of sound insulation materials. The common ones are solid bricks, reinforced concrete walls, wood plates, gypsum boards, iron boards, sound acoustic felts, fiberboards, and so on.

Strictly speaking, almost all materials have a sound insulation effect, the difference is that the volume of the interval between different materials is different. For the same material, due to the different areal density, there is a relatively large change in its sound insulation.