EXPERIMENTAL INVESTIGATION OF THE EFFECTS OF ABSORPTIVE SURFACES ON THEACOUSTICAL PERFORMANCE OF A BARRIER IN AN ANECHOIC CHAMBER

摘要

Roadside noise barriers are an effective way to reduce unwanted traffic noise reaching nearby areas. Barrier performance can be limited by sound reflections from the source side of the barrier, especially in the case of parallel barriers. Making barriers sound absorptive will decrease reflections from the barrier and amplification between parallel barriers. Absorbent barriers are generally more expensive than reflecting ones, and therefore it is important to know the optimum amount and placement of absorbing treatment on a barrier.