道路新設に伴う市街地騒音レベル分布の一予測理論とシミュレーション実験

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It is well known that the noise pollution in our cities is chiefly caused by road traffic noise and the polluted area increases rapidly with the development of a city. Generally speaking, in the problem of noise control, a systematic prediction of the statistics of noise level before the establishment of a new road is, of course, more important than the case-by-case countermeasures applied after the completion of new roads. In this paper, a new attempt to solve the above prediction problem in terms of the level probability disribution from which all information concerning the lower and higher order moments of noise level can be derived is theoretically considered in connection with the internal structure of traffic noise (e. g. , the distance from an observation point, environmental noise level distribution, and, as controllable quantities, the average number of vehicles flowing on the new road, the mean velocity, of the vehicles, the ratio of the number of large-type vehicles to that of small-type vehicles, their acoustic power levels, etc. ). More concretely, for the purpose of predicting the effect of vehicle noise on the level probability distribution, an explicit expression for the probability density function of urban noise fluctuation after the completion of a new road is derived in the general form of a nonorthogonal expansion series including the effect of the enviromental noise level before the establishment of the road as the first term (cf. Eq. (11)). The effect of internal structure on traffic noise is reflected successively by each expansion coefficient (cf. Eq. (24)). The validity of our prediction theory is also supported experimentally by a digital simulation technique.
社団法人日本音響学会の論文
1975-02-01

道路新設に伴う市街地騒音レベル分布の一予測理論とシミュレーション実験

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