Abstract: Based on noise experiment of the elevated bridge of Chengdu-Dujiangyan high-speed railway, structural noise and the wheel-rail noise are researched in this paper. The test results indicate that, low-frequency noise plays an important part in the noise of the elevated structure; linear weighted method is suggested to use due to the quality of structural noise. In addition, there are two distinct band of noise peaks, one at the lower frequency band (under 100 Hz), and the other one at the higher frequency band in the center frequency of 800 Hz. The low frequency noise is mainly from structural noise. Furthermore, the structural noise is concentrated at the bridge’s ramp below and decays slower compared to the wheel-rail noise.Prediction data result from the noise prediction model which applies acoustic principles were compared with experimental results and error is successfully controlled in less than 4%.

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。

关键词: 声学, 轨道交通, 高架桥梁, 现场试验, 噪声预测模型