Many people use acoustic materials indiscriminately and the sound rooms are filled with sound absorbing materials everywhere. It feels poor. Ask him why he did this, he can’t tell why. He just saw someone else doing this and followed... Some people even made sound absorption. Sound insulation and shock absorption are confused, although they are often performed simultaneously, shock absorption + sound insulation + sound absorption (energy consumption in the cavity). So what is the principle of sound insulation and what materials should be used?
To be soundproof, we must first understand what sound is. The propagation of the vibration generated by the sounding body in the air or other substances is called sound wave. Sound waves are transmitted to all directions with the help of various media. The particle where the sound wave travels vibrates in the vicinity of the equilibrium position along the propagation direction. The propagation of the sound wave is essentially the transmission of energy in the medium.
Here we focus on two points: vibration propagation and energy transfer. Then the starting point for sound insulation should be to block vibration propagation and consume energy.
There is a general rule for sound insulation of partition walls, that is, the heavier the material (area density, or mass per unit area), the better the sound insulation effect. For a single layer of dense and solid wall, every time the areal density doubles, the amount of sound insulation increases theoretically by 6dB. This law is the law of quality.
In addition, any material has an inherent resonance frequency. When the frequency of the sound wave is the same as the resonance frequency of the sound insulation material, resonance will start to occur, and the amount of sound insulation at this frequency will be seriously reduced. The greater the density of matter, the lower the resonance frequency.
Therefore, what we often emphasize when doing sound insulation is "multi-layer composite structure". For example, a layer of 15mm gypsum board is first fixed on the keel, and then a layer of 9mm gypsum board is laid horizontally and crisscross. The effect is even better than that of double-layer 15mm gypsum board. The effect is more ideal. The purpose of this is to reduce the anastomosis effect and improve the sound insulation effect.
In general, if you want to do sound insulation and vibration reduction well, you need to find a way to block the sound propagation path, use high-density, high-damping materials, and composite structures. In the end, the huge sound energy is strangled in the audio-visual room, and at the same time, the external evil sound forces are prevented from invading.
To be soundproof, we must first understand what sound is. The propagation of the vibration generated by the sounding body in the air or other substances is called sound wave. Sound waves are transmitted to all directions with the help of various media. The particle where the sound wave travels vibrates in the vicinity of the equilibrium position along the propagation direction. The propagation of the sound wave is essentially the transmission of energy in the medium.
Here we focus on two points: vibration propagation and energy transfer. Then the starting point for sound insulation should be to block vibration propagation and consume energy.
There is a general rule for sound insulation of partition walls, that is, the heavier the material (area density, or mass per unit area), the better the sound insulation effect. For a single layer of dense and solid wall, every time the areal density doubles, the amount of sound insulation increases theoretically by 6dB. This law is the law of quality.
In addition, any material has an inherent resonance frequency. When the frequency of the sound wave is the same as the resonance frequency of the sound insulation material, resonance will start to occur, and the amount of sound insulation at this frequency will be seriously reduced. The greater the density of matter, the lower the resonance frequency.
Therefore, what we often emphasize when doing sound insulation is "multi-layer composite structure". For example, a layer of 15mm gypsum board is first fixed on the keel, and then a layer of 9mm gypsum board is laid horizontally and crisscross. The effect is even better than that of double-layer 15mm gypsum board. The effect is more ideal. The purpose of this is to reduce the anastomosis effect and improve the sound insulation effect.
In general, if you want to do sound insulation and vibration reduction well, you need to find a way to block the sound propagation path, use high-density, high-damping materials, and composite structures. In the end, the huge sound energy is strangled in the audio-visual room, and at the same time, the external evil sound forces are prevented from invading.