Noise pollution in modern cities has become a primary environmental pollution. Buildings and high-speed acoustic environmental problems have attracted more and more attention. The selection of appropriate materials for sound absorption and noise barrier disposal of buildings is one of the more common and basic technical methods in building noise control engineering. However, because of the lack of knowledge about the methods of noise control, "sound absorption" and "sound insulation", as completely different concepts, are often confused. Glass wool and rock mineral wool have excellent sound absorption function but poor sound insulation function. In order to use the data reasonably and improve the noise control effect of buildings, it is necessary to further know and clarify the two concepts of "Noise Barrier" and "Noise Barrier".
The difference between the noise barrier and the noise barrier is that the sound absorption focuses on the magnitude of the reflected sound energy on the side of the sound source, and the policy is to reduce the reflected sound energy. The sound insulation focuses on the size of the transmitted sound energy on the other side of the incident sound source, and the guideline is to reduce the transmitted sound energy. The attenuation and absorption of the incident sound energy by the sound-absorbing material is usually only a few tenths, so its sound absorption capacity, that is, the sound absorption coefficient, can be indicated by a decimal; while the sound-absorbing material can attenuate the transmitted sound energy to 10-3 of the incident sound energy. 10-4 or less, in order to facilitate the expression, its sound insulation capacity is indicated in decibels. Regarding the noise barrier, to weaken the transmitted sound energy and obstruct the transmission of sound, it cannot be as porous, loose and breathable as the sound-absorbing material. On the contrary, its raw materials should be heavy and dense, such as PC board, endurance board, and Noise Barrier board. , Steel plate and other materials. The demand for sound insulation materials is dense without pores or gaps; it has a larger weight. Because this type of noise barrier is dense, it is difficult to absorb and transmit sound energy and has a strong reflection energy, so its sound absorption function is poor, and the most important thing is the effective sound insulation.
In engineering, the policy and focus of sound absorption Noise Barrier and sound insulation Noise Barrier are different. The policy of sound absorption Noise Barrier is to weaken the repetitive reflection of sound in the room, that is, to weaken the indoor reverberation sound and shorten the reverberation sound. The successive moment of the sound is the reverberation moment; in the case of successive noise, this attenuation is manifested as a decrease in the indoor noise level. This point is for the sound source and the sound absorption material in the same construction space. As for the sound from adjacent rooms, the Noise Barrier also absorbs the sound, which is equivalent to improving the sound insulation of the enclosure layout. It can be seen that the use of noise barrier or noise barrier layout to block noise is much higher than the noise reduction effect of noise barrier. This shows that when the noise source in a room can be separated, the noise barrier should be the first choice; when the sound source cannot be separated and the indoor noise needs to be reduced, the noise barrier should be used.
But the unique role of noise barrier is more on the ability to shorten and adjust the indoor reverberation time, which cannot be replaced by any other information. Because the volume of the room is directly proportional to the reverberation time, a large building space has a long reverberation time, and then affects the indoor listening conditions. At this moment, it is often inseparable from the adjustment of the reverberation time by the Noise Barrier. For large halls such as movie theaters, auditoriums, concert halls, etc., according to their different listening needs, you can choose the appropriate noise barrier, adjust the reverberation moment according to the body shape, and achieve the needs of different one-sided feelings such as clear and full listening. From this point of view, the absorption of Noise Barrier shows its unique importance, so it is usually used in KTV and other indoors. Outdoors, such as high-speed noise barrier, railway noise barrier, highway noise barrier, high-speed noise barrier, etc. Choose a noise barrier.
HeBei Shengsen Metal Products Co., Ltd. is located in Shijiazhuang City, Hebei Province. We have convenient transportation and advantageous location, with quick access to Tianjin Port. We can supply all kinds of wire and wire mesh products
with fine quality. Our company mainly deals with the following products: our main products include Expanded Metal Mesh.Aluminium expanded metal mesh.Powder coated expanded wire mesh. Gabion Mesh . Gabion Box .Gabion Mattress.Gabion Wall Baskets.noise fence.
