用边界元-有限元法研究高架结构辐射噪声

Analysis of Elevated Structure Radiated Noise with BEM-FEM Method

高架结构是城市轨道交通的重要部分,其引起的结构辐射噪声问题引起了越来越多的关注。基于边界元Helmholtz积分公式和有限元流固耦合系统理论,推导了结构振动加速度与辐射声压之间的声传递向量,该传递向量可通过单元辐射叠加法求得,结合采用直线电机车辆的北京首都机场快轨线某段高架桥梁段现场试验结果进行了比较分析。结果表明:使用该方法计算的声压结果与实测结果的声压频谱分布及变化趋势吻合较好,该方法可用于城市轨道交通高架结构辐射噪声的预测研究。

Urban rail transit is becoming an important means of transportation and elevated structure is one important part of urban rail transit.So the radiation noise induced by elevated structure attracts more and more attention.Based on the theory of Helmholtz integral equation of BEM and fluid-structure coupling system of FEM,the sound pressure transmission vector reflecting the relation between structural vibration acceleration and radiation of sound pressure is derived and solved by the element radiation superposition method.The calculated results are in good agreement with the experimental data from a viaduct section of the Beijing airport rapid rail transit.