124 非定常差分法を用いた各種道路構造における騒音伝搬の可視化(オーガナイズドセッション : O.S.6 交通騒音/振動の制御(自動車・鉄道・航空機II))

概要

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We have been examining an application of the finite difference time domain method (FDTD) to road traffic noise problem. The FDTD method, by which transient propagation of sound wave in sound fields with arbitrary shapes and boundary conditions can be easily visualized, is effectively utilized when designing noise reduction countermeasures of road structures. In this paper, noise propagation characteristics of several road structures such as flat roads with barriers, depressed roads and semi-underground roads are investigated. The FDTD calculation is carried out on 2 dimensional sound fields which are assumed to be the sectional shapes of the road structures and the sound propagations are visualized by animation. In addition, a quantitative investigation on noise reduction effects of varying shapes and absorption treatments is performed.
2001-06-05