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在工业系统中,输送各种不同流体的大型管道本身会辐射强烈的噪声.当某些工厂车间内布满了大量管道,虽然在管道近旁的声压并不太高,但由于管道表面积大,相应辐射的声功率也大,因此实际上成为车间的主要噪声源.实践表明,当管道直径超过20cm以上,由管道表面辐射的噪声将对外界起到显著作用.这类管道辐射由于具有线声源的特点,随距离的一次方成反比,即随距离加倍衰减3分贝,而不是通常球面发散衰减约6分贝,因此衰减较慢,能传播到较远的地方,受到噪声污染的范围也较大.
In industrial systems, large pipelines that carry a wide range of different fluids can radiate strong noise themselves.When some of the factory floors are full of pipes, sound pressure is not too high in the vicinity of the pipework, but because of the large pipe surface area, The corresponding sound radiation power is also large, so in fact become the main source of noise in the workshop.Practice shows that when the pipe diameter exceeds 20cm, the noise emitted by the pipe surface will play a significant role in the outside world.This type of pipe radiation due to the presence of linear sound The characteristics of the source, inversely proportional to the first power of the distance, decay by 3 decibels with distance instead of the usual spherical decay of about 6 decibels, so the attenuation is slow and can propagate further to the area subject to noise pollution than the Big.