中文摘要：

结合成灌快铁高架桥梁的噪声试验,对高架桥梁附近的噪声传播规律进行研究。实测结果表明：桥梁结构噪声以低频为主,采用线性计权进行评价更为合适;实测高架桥梁附近的噪声在100 Hz以下和800 Hz附近出现噪声峰值,前者主要为桥梁结构噪声;桥梁结构噪声主要集中在桥梁斜下方一定区域,且随横向距离的衰减较慢。将实测结果与建立的噪声简化预测模型进行比较,二者吻合较好,预测模型较好地反映了快速铁路高架桥梁附近的声场分布。

英文摘要：

Based on noise testing of the elevated bridges of Chengdu-Dujiangyan rapid railway, the noise propagation law was researched in this paper. The test results indicate that the structural noise of the elevated bridges is mainly in low-frequency range. Thus, linear weighted method is suggested for evaluation of the structural noise. In addition, there are two noise peaks in distinct frequency bands, one is in the lower frequency band below 100 Hz, and the other is in the higher frequency band around 800 Hz. The former is mainly the structural noise from the position below the bridge＇ s ramp, and decays more slowly than the wheel-rail noise. Then, a simplified model for noise prediction based on acoustic principles was established. The results of modeling were Compared with those from testing. Both results were in good agreement. Therefore, this noise prediction model can be used to simulate the sound field distribuffon near the rap.id railway.