多跨简支梁桥低频噪声预测及空间分布研究

发布时间：2018-03-08 09:18

本文选题：轨道交通　切入点：多跨桥梁　出处：《工程力学》2017年03期 　论文类型：期刊论文

【摘要】：现有的桥梁噪声预测方法大多仅考虑一跨桥梁的噪声辐射而忽略了相邻跨桥梁的影响。提出了预测多跨桥梁低频噪声的方法:首先,通过车辆-轨道-桥梁动力相互作用分析计算了列车通过多跨桥时的桥梁响应;然后,采用2.5维边界元方法获得多跨桥梁的声模态传递向量;最后结合桥梁动力响应和声模态传递向量求得多跨桥梁的总辐射噪声。以某轨道交通U梁为研究对象,对比了采用多跨桥梁模型、单跨桥梁模型的计算声压结果的异同,并与实测值进行比较,明确了在预测远场噪声时必须采用多跨桥梁计算模型。研究表明,多跨桥梁的辐射噪声沿桥梁纵向分布较为均匀,在现场实测时可选取任意横断面位置进行噪声测试。
[Abstract]:Most of the existing bridge noise prediction methods only consider the noise radiation of one span bridge and ignore the influence of adjacent bridge. This paper proposes a method to predict the low frequency noise of multi span bridge. The bridge response of a train passing through a multi-span bridge is calculated by means of the vehicle-rail-bridge dynamic interaction, and then the acoustic modal transfer vector of the multi-span bridge is obtained by the 2.5 dimensional boundary element method. Finally, the total radiated noise of multi-span bridge is obtained by combining the dynamic response of bridge and acoustic mode transfer vector. Taking the U-beam of a rail transit as the research object, the differences and similarities of the calculation results of sound pressure between the multi-span bridge model and the single-span bridge model are compared. Compared with the measured data, the calculation model of multi-span bridge must be used in the prediction of far-field noise. The research shows that the radiation noise of multi-span bridge distributes evenly along the bridge longitudinal direction. Any cross section position can be selected for noise measurement in the field measurement.
【作者单位】：东南大学桥梁工程系;同济大学桥梁工程系;
【基金】：国家自然科学基金项目(51608116) 江苏省自然科学基金项目(BK20160681) 上海市自然科学基金项目(15ZR1442800)
【分类号】：U441.3

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