SCALE-MODEL EVALUATION OF THE EFFECTIVENESS OF NOVEL ABSORBER TREATMENTS FOR INDUSTRIAL NOISE CONTROL

摘要

Sound fields in industrial buildings are often controlled by the installation of arrays of baffles suspended from the building roof. The performance of baffle arrays covering the complete ceiling area has recently been evaluated using scale-modeling and ray-tracing techniques [1]. It is clear that such baffle arrays can reduce steady-state sound-pressure levels and reverberation times (RT) significantly. Unfortunately, the treatments are also often expensive, since large areas of ceiling are covered. Furthermore, the effectiveness may be reduced by the fact that the ceiling baffles are located a long way from sources and receivers on the floor. This report summarizes the results of further scale-model tests aimed at evaluating novel absorber treatments - in particular, local treatments which are less extensive and expensive and, thus, potentially more cost-effective than traditional treatments.