关键词: 声学, 轨道交通, 高架桥梁, 现场试验, 噪声预测模型

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%.