Recently, Phoenix Legend held a concert in the "Bird's Nest", and the fans sang hoarsely but felt that the surrounding sound was not loud, and it was difficult to hear the fans' voices in the live video. Why can't the "Bird's Nest" hold the audience's singing? What other life scenarios are sound-absorbing materials used in?
Absorbent materials refer to those that absorb sound, reducing sound reflections and echoes. Sound originates from the vibration of an object, causing the vibration of adjacent air to form sound waves, which propagate in the air medium to the surrounding areas.
When the sound is transmitted to the surface of the sound-absorbing material, part of the sound energy is reflected, part of it penetrates the material, and part of it is converted into heat energy by the sound energy due to the vibration of the material or the friction of the surrounding medium when the sound propagates in it, so that the sound energy is lost, that is, the sound is absorbed by the material.
The "Bird's Nest" is equipped with two layers of film, the outer layer is a transparent film used to block rain and snow, and the inner layer is made of sound-absorbing film.
The hollow structure formed by the top sound-absorbing film and the upper and lower double-layer membranes can have a series of damping vibrations, resonances, air friction and other effects with the sound waves, turning the sound wave energy into thermal energy attenuation and loss, and achieving a good sound absorption effect.
At the same time, with the sound-absorbing materials set on the steel structure, it can not only resolve the noisy sound of more than 90,000 people at the same time, but also keep the audience away from the noise outside the venue.
The electro-acoustic amplification system used in the venue makes the speech intelligibility index of the "Bird's Nest" reach 0.6, so that the audience can hear the broadcast clearly in any corner of the venue.
That is, the voice of the audience's chorus is absorbed by the sound-absorbing material, while the singer's voice is better accentuated by the amplification system. So the rumors questioning the fans' lip-synching are self-defeating.
People initially used natural organic materials such as cotton and linen as sound-absorbing materials, but their use was limited because these materials were not fireproof, moisture-proof, perishable and other factors.
Subsequently, inorganic materials such as expanded perlite blocks, rock wool, etc., began to replace natural organic materials as sound-absorbing materials. However, these materials have not been widely used because of their brittleness, difficulty in construction, and irritation to human skin.
In modern times, people have begun to use synthetic polymer materials as the basis to make new sound-absorbing materials. This kind of sound-absorbing material has the advantages of excellent sound absorption performance, low thermal conductivity, anti-corrosion and moisture-proof, low cost, simple process, flame retardant, etc., so it has received extensive attention, research and development in recent years.
Sound-absorbing materials are mainly used to control noise and improve the indoor acoustic environment, such as conference rooms, recording studios, theaters and other places. Common sound-absorbing materials include fabric sound-absorbing panels, metal sound-absorbing panels, mineral wool sound-absorbing panels, wooden sound-absorbing panels, etc.
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