Do you understand the role of sound insulation materials?
Release time：
2023-10-17
It should be said that there are three main mechanisms for noise reduction and soundproofing: sound absorption, which absorbs the sound source and noise in the environment; Damping and vibration reduction. Isolation and vibration reduction of sound and vibration sources; Sound insulation, isolation from external noise. Sound absorption measures often involve creating a good listening environment.
It should be said that there are three main mechanisms for noise reduction and soundproofing: sound absorption, which absorbs the sound source and noise in the environment; Damping and vibration reduction. Isolation and vibration reduction of sound and vibration sources; Sound insulation, isolation from external noise. Sound absorption measures often involve creating a good listening environment. Damping and vibration reduction are active methods of noise reduction. And sound insulation is a passive but effective protective measure for soundproof rooms.
Fibers and their aggregates are different from metals or other structurally dense materials, which rely on reflection for sound insulation and rarely absorb sound.
Fiber, as a porous material, is a good and comprehensive material for sound insulation and absorption (with a fluffy surface structure). Because fibers are porous and loose structures, air flows directly through the pores, and air acts as a low-pass filter, attenuating high-frequency sound waves and distorting the noise spectrum; Moreover, there are many interfaces in the pores, which form the back and forth reflection and vibration of sound waves, resulting in internal friction. This reduces the intensity of the voice and changes its propagation path, achieving the effect of sound absorption and noise reduction.
For example, composite wool felt and ultrafine glass fiber felt used in construction. Mineral wool slag, asbestos and hemp fiber board, resin composite board, etc; Indoor wall coverings, carpets, curtains, and automotive interior decorative fabrics used for decoration can achieve good noise reduction and sound-absorbing barriers.
Most fiber materials can absorb moisture, especially natural fibers. After absorbing water, the binding force between fiber molecules decreases. Therefore, it can improve the sound absorption performance of the material at high frequencies. The vibration and friction between fibers can convert the density of sound waves into friction energy and thermal energy, gradually reducing sound energy and reducing noise.
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