Adaptative study of closed and semi-closed noise barriers in a 3D ray tracing method

Closed barrier and semi-closed barrier are presented in the paper, the adaptive research is performed. Reducing effect of noise barrier with closed and semi-closed structure was studied by noise simulating program—RAYNOISE. The applied range of the closed and semi-closed noise barrier is confirmed. Simulating results showed that noise reduction of closed-shaped structure has good reducing effect at higher area of the shadow area. The noise reduction is 6dB(A) at the receiving point 22.2m height and 60m far behind the noise barrier, which is 1dB(A) higher than the semi-closed noise barrier. So it is suitable for higher receiving point. Semi-closed-shaped noise barrier has a good reducing noise effect at the area lower than 3m.