道路交通流からの騒音暴露エネルギーに関する統計的考察

概要

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Statistical properties of total noise exposure and its time average due to road traffic are studied theoretically. At first the noise emitted in an open half space by freely flowing vehicles on a straight lane is disccused. The cumulants and the time correlation of sound intensity have been obtained using the regression equations by which PWLs of vehicles are related to their velocities. Simple formulae for calculating L_<eq> have also been derived. They show that the dispersions of velocity and PWL of vehicles increase L_<eq> generally. The variation coefficients of the total noise exposure and its time average decrease monotonically with increasing the observation time length and the distance from a road. Then a more general case of road traffic noise is studied using a simplified model. A measure of stability of the total noise exposure and its time average as statistical parameters is proposed. The conditions to confirm the stability of these parameters have been derived.
社団法人日本音響学会の論文
1978-12-01