Considerations on noise-shielding performance of a barrier with an open-tube array on the source side of its edge

Abstract

Sound fields around a barrier edge with an open-tube array are numerically calculated to investigate how the tube array affects barrier performance. Results show that the open tubes arrayed on the source side of the barrier edge are effective in some cases. On basis of the results, a hypothesis regarding the effects of the open tubes at the barrier edge is considered and tested. It is revealed that sound pressure levels behind the barrier are significantly suppressed when the phase difference between incident waves from the source to the upper and lower ends of a tube is small.