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研究论文

摘要：以等效连续A声级L_eq为交通噪声的评价量,使用一种经过适当简化的计算模型和几何声学方法,在仅考虑直达声和有限数目的前次反射声的情况下,给出了交通噪声在沿道路（或河道）分布的建筑群中纵深方向的传揩与衰减规律,并说明了其物理机制。所得理论结果与实测数据相符,其标准偏差小于1.5dB,平均偏差在±1.0dB范围内。

Abstract：A physical model for describing propagation and attenuation of traffic noise along street or river was developed using geometrical acoustics method with continuous A-weighted sound level (Leq)as a rating index. Only direct sound and prior reflections of limited number were considered during the computation. The theoretical result based on the above method was compared with that obtained during field survey in Changzhou City and it was found that the standard deviations for the theoritical values were below 1.5dB and the average deviations were all in the range of ±1.0dB.