根据几何声学原理，声音在室外是沿直线传播的，如果在声源和接收点之间插入一道墙体或者具有一定隔声量的物体阻挡声音的传播路径，使得在接收位置看不到声源，接收不到直达声，则在接收点的声压级就会明显降低，这就是声屏障隔声原理。（有些时候我们无法将噪声源完全封闭起来，又需要较低的造价获得理想的降噪效果。）
According to the principle of geometric acoustics, sound propagates along a straight line outdoors. If a wall or an object with certain sound insulation capacity is inserted between the sound source and the receiving point to block the sound propagation path, so that the sound source can not be seen at the receiving position and the direct sound can not be received, then the sound pressure level at the receiving point will be significantly reduced, which is the sound barrier sound insulation principle. (sometimes we can't completely close the noise source, and we need lower cost to get ideal noise reduction effect.)
由于声波在遇到障碍物时会发生反射现象，故在声源和接收者之间插入密实的屏障会降低噪声。
Due to the reflection of sound waves when they encounter obstacles, inserting a dense barrier between the sound source and the receiver will reduce the noise.
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由于声源具有波动特性，所以总有一部分声波从声屏障的顶端绕射过去，这使得声屏障的衰减受到了一定的限制。
Due to the fluctuation characteristics of the sound source, a part of the sound wave diffracts from the top of the sound barrier, which limits the attenuation of the sound barrier.
According to the principle of geometric acoustics, sound propagates along a straight line outdoors. If a wall or an object with certain sound insulation capacity is inserted between the sound source and the receiving point to block the sound propagation path, so that the sound source can not be seen at the receiving position and the direct sound can not be received, then the sound pressure level at the receiving point will be significantly reduced, which is the sound barrier sound insulation principle. (sometimes we can't completely close the noise source, and we need lower cost to get ideal noise reduction effect.)
由于声波在遇到障碍物时会发生反射现象，故在声源和接收者之间插入密实的屏障会降低噪声。
Due to the reflection of sound waves when they encounter obstacles, inserting a dense barrier between the sound source and the receiver will reduce the noise.
图片
picture
由于声源具有波动特性，所以总有一部分声波从声屏障的顶端绕射过去，这使得声屏障的衰减受到了一定的限制。
Due to the fluctuation characteristics of the sound source, a part of the sound wave diffracts from the top of the sound barrier, which limits the attenuation of the sound barrier.
