广州空压机匠心厂

According to the material classification, sound barrier can be divided into the following categories: metal sound barrier (metal shutter, metal sieve mesh), concrete sound barrier (lightweight concrete, high strength concrete), PC sound barrier, glass fiber reinforced plastic barrier and so on. According to different uses, it can also be divided into several categories: railway noise barrier, highway noise barrier, urban landscape noise barrier, noise reduction barrier in residential area.

在空气中传播的声波遇到声屏障时，就会产生反射、透射和绕射现象。一部分越过声屏障顶端绕射到达受声点；一部分穿透声屏障到达受声点，一部分在声屏障壁面产生反射。声屏障的插入损失主要取决于声源发出的声波沿着三条道路传播的声能分配。

When the sound wave propagated in the air meets the sound barrier, it will produce reflection, transmission and diffraction. Some of them pass through the top of the barrier to arrive at the receiving points. Some of the penetrated sound barriers arrive at the receiving points, and some part reflects on the surface of the barrier. The insertion loss of sound barrier is mainly determined by the sound energy distribution transmitted by the sound source along the three roads.

声屏障的作用就是阻挡直达声的传播，隔离透射声，并使绕射声有足够的衰减。当声波撞击到声屏障的壁面上时，会在声屏障边缘产生绕射现象，而在屏障背后形成“声影区”。我们所期待的声屏障的减噪效果就在“声影区”的范围内。与光影区相比较，由于声波波长比光波波长大的多，因此，这种“声影区”的边界并不明显，经过屏障边缘之外，声源发出来的声波可以直接到达的范围，叫做“亮区”。从亮区到声影区之间还有一小段“过渡区”。位于“声影区”内的噪声级低于未设置声屏障时的噪声级，这就是声屏障降噪的基本原理。

The function of sound barrier is to block the propagation of direct sound, isolate the transmitted sound and make the diffraction sound attenuated. When the sound wave hits the wall of the sound barrier, it will produce diffraction phenomenon at the edge of the barrier, and form a "shadow area" behind the barrier. The noise reduction effect of sound barrier we expect in the scope of "shadow zone" in. Compared with the light and shadow area, because the wave wave length is much larger than the light wave, the boundary of this "sound film area" is not obvious. Through the edge of the barrier, the sound waves from the sound source can reach the range directly, called "bright areas". From the light to the sound shadow zone there is a small "transition zone". The noise level in the "voice and shadow area" is lower than the noise level when no sound barrier is set up, which is the basic principle of noise barrier noise reduction.