INSTITUTE OF SOUND AND VIBRATION RESEARCH

摘要

Comparison of measurements with over 400 separate predictions for wedge-shaped barriers of bare compacted earth shows that Maekawa's thin barrier theory is adequate for predicting A weighted barrier attenuation for construction noise sources. The mean discrepancy between measured and predicted barrier attenuation was 0.5 dB (A). Kurze's wide barrier theory predicted A weighted barrier attenuation with reasonable accuracy. The mean deviation between measured and predicted barrier attenuation was 2.0 dB (A), theory generally overpredicting. Other studies with a controlled loudspeaker source show the thin barrier theory to be suitable for predictions with cuttings whose sides are covered very sparsely with grass. Attenuations afforded by real, full sized cuttings and embankments whose sides and edges are covered with densely grown grass or loose shingle are 5 dB greater than Maekawa predictions.