INCREASE OF THE NOISE BARRIER EFFICIENCY WITH AN ACTIVE NOISE CONTROL SYSTEM

摘要

This paper present a new in situ experiment concerning the achievement of an active noise barrier on one hand and on the other hand, the development of an active noise control (ANC) simulation coupled with a 3D acoustic radiation code. The objective of this new in situ test is the study of an active barrier implementation in order to reduce tonal and broadband noise behind the barrier. The main observed results show a good level reduction of tonal and broadband noise on a large zone behind the barrier. Simultaneously with this experiment, a numerical tool was developed in order to simulate the implementation of an ANC system on a 3D rigid barrier and to predict the expected noise attenuation thanks to this implementation. The early computations show agreement with the experimental results. This work allows more information concerning the possibilities of some practical implementation of an ANC system in order to increase the noise barrier efficiency. It is also interesting with respect to the practical available noise reduction and with respect to the shape and the size of the noise attenuation area behind the barrier.