You may not know the sound absorption mechanism of sound absorbing materials!
According to the sound absorption mechanism, sound absorption materials are divided into:
①Porous materials attenuate sound waves from the surface to the interior through many small open channels, they mainly absorb medium and high frequency sound waves, there are various organic or inorganic fiber aggregates, fibers and their products, as well as open-cell foam and expanded perlite products porous structure.
②Flexible materials that absorb sound by resonance (such as closed-cell foam, absorbs mid-frequency), film-like materials (such as plastic film or cloth, canvas, linoleum, and artificial leather, absorbs low-frequency and mid-frequency), plate-like materials (such as plywood, Cardboard, asbestos cement board, gypsum board, etc.) absorb low frequencies and perforated boards (made by punching various sheet materials or metal sheets and absorbing medium frequencies).
The combination of the above materials can expand the sound absorption range, improve the sound absorption coefficient, stick decorative sound-absorbing panels on the walls or ceilings, install porous materials and perforated panels or membrane materials on the walls, and even use floating clouds to hang, which can improve the interior Sound quality, noise control. In addition to absorbing air-borne sound, porous materials can also attenuate vibrations caused by structure-borne sound and air-borne sound. Filling porous materials into composite structures composed of various plate-like materials can improve sound insulation and lighten structural weight.
For materials that absorb incident sound energy, sound-absorbing materials are mainly used to control and adjust indoor reverberation time, eliminate echoes, and improve indoor listening conditions; they are used to reduce noise in noisy places and improve living and working conditions (see Sound absorption and noise reduction); it is also widely used to reduce noise in ventilation and air conditioning ducts.