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EVALUATION METHOD FOR REFLECTED SOUND AND PREDICTION METHOD FOR ROAD NOISE WITH REFLECTED SOUND TAKEN INTO ACCOUNT
EVALUATION METHOD FOR REFLECTED SOUND AND PREDICTION METHOD FOR ROAD NOISE WITH REFLECTED SOUND TAKEN INTO ACCOUNT
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机译:反映声音的声音评估方法和考虑道路声音的道路噪声预测方法
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摘要
PROBLEM TO BE SOLVED: To realize an estimation method having sufficient prediction accuracy, by repeating reflections under a condition that an incidence angle and a reflection angle of a sound velocity at a reflection boundary element are equal to each other, and obtaining a total acoustic energy amount of the sound velocity reaching the boundary element including a reflection sound prediction point set on a model after the reflections are attenuated. ;SOLUTION: In a two-dimensional road sectional model constituted of a viaduct girder 1, a right and a left sound-shutting walls 2, 2 and a road face 3, a noise prediction point O is set while line sound source S1, S2 are set to vehicles of upper and lower lanes. Sound is treated geometrically acoustically. A sound at a sound source position set at a (k)th time is displayed in vector form and a vector quantity D is obtained as a sound velocity. In order to obtain a reflection influence coefficient ηat the noise prediction point O, acoustic energies of the sound velocity D reaching a sound detection boundary element ΩD' are sequentially added, and an accumulated total energy is obtained. A noise energy of the sound velocity consumed at a reflection boundary element ΩD of a propagation model is directly calculated in the same manner. The reflection influence coefficient η is obtained from both energies.;COPYRIGHT: (C)1998,JPO
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