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公路隧道内交通噪声预测

, PP. 147-151

Keywords: 环境工程,交通噪声,预测模型,公路隧道,噪声降低值

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Abstract:

为合理预测公路隧道内交通噪声传播状况,界定了公路隧道内的长空间声场特性,系统阐述了3种基于像源理论的交通噪声预测模型,通过在实体隧道中测定声源分别为低频和高频、接收者在不同位置时的噪声值,并将其与三种理论模型预测值进行对比,结果表明相干模型在低、中、高频范围内比不相干模型和ASJ模型能更精确地预测隧道内噪声传播状况,其预测值与实测值误差在2dB左右;而不相干模型和ASJ模型仅可用于预测高频段时噪声的平均值。可见,相干模型是预测以中低频为主的公路隧道内交通噪声传播的合理模型,该预测模型可用于进行公路隧道内降噪优化设计。

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