Study on secular change of sound power spectrum in PO pavement

摘要

It has been confirmed that the effect of noise reduction on Porous asphalt pavements changes over time after construction. In the study on the secular change of the sound power level in porous asphalt pavements, comparison of the measured value after construction and predicted value by ASJRTN model on sound power level was conducted. As a result, the difference between the actual measurement value and the ASJRTN model was confirmed for both of the three model routes. In this study, we focused on the power spectrum of noise generated from a vehicle traveling on a porous asphalt pavements, and confirmed the difference between the measured value and the predicted value of the ASJRTN model. As a result, the measured dominant frequency was higher than the predicted value. At the A characteristic relative band power level of 1 kHz to 2 kHz, the measured sound pressure level tended to rise more than the predicted value.