Characterizing low-frequency structure-borne noise from multi-span bridges on high-speed railways

Abstract

As high-speed railways become increasingly prevalent in urban areas and operating speeds continue to rise, the issue of bridge noise has become a critical concern, giving that bridge sections account for over 80% of high-speed railway noise. As train speeds continue to increase, the number of bridge spans included in a noise prediction model becomes a crucial factor in accurately predicting bridge noise. To address this issue, using a 32-m simply supported box girder, which is commonly used for high-speed trains, as an example, we conducted a comprehensive study using both the Fourier series method and the 3D boundary element method to investigate the impact of bridge span number on highspeed railway bridge noise. Our results indicate that the effect of bridge span number on bridge noise is highly dependent on the location of observation points with respect to the bridge and the distribution of bridge noise. Specifically, when beyond 54 m and part of the near-field area, a minimum of five bridge spans are necessary to obtain a more precise estimation of total bridge noise. This study aids to control bridge noise and can inform the implementation of noise reduction measures of varying lengths at different locations along the bridge.

摘要

随着高速铁路在城市地区的日益普及和运营速度的不断加快,桥梁噪声问题已经成为一个重要 问题,因为桥梁区段的噪声占高速铁路噪声的80%以上。随着列车速度的不断加快,噪声预测模型中 包含的桥梁跨径数成为影响准确预测桥梁噪声的主要因素。为了解决这一问题,本文以高速列车常用 的32 m简支箱梁为例,采用傅里叶级数法和三维边界元法进行建模,研究桥梁跨数对高速铁路桥梁噪 声的影响。结果表明,桥梁跨数对桥梁噪声的影响很大程度上取决于观测点相对于桥梁的位置和桥梁 噪声的分布。具体来说,当超过54 m和部分近场区域时,至少需要5 跨桥梁才能获得更精确的桥梁总 噪声。该研究有助于桥梁噪声的控制,并可为在桥梁沿线不同位置实施不同长度的降噪措施提供 参考。