车桥耦合振动作用下连续梁桥的声辐射特性  

Acoustic Radiation Characteristics of Conti nuous Beam Bridges under Vehicle Bridge Coupling Vibration

作　　者：李星宇 王少钦 LI Xing-yu;WANG Shao-qin(College of Civil Engineering,Beijing Uni versity of Civil Engineering and Architecture,Beijing 100044,China;College of Science,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学理学院,北京100044

出　　处：《计算机仿真》2024年第7期200-206,共7页Computer Simulation

摘　　要：为了探究城市轨道交通某高架线连续梁辐射噪声特性及对周围环境的影响,将列车-桥梁耦合振动理论与桥梁结构声辐射分析的边界元法相结合,以北京地铁5号线某高架段三跨连续变截面箱梁桥为研究对象,编写计算程序求解桥梁的振动响应,将各跨竖向振动计算结果作为声学边界条件输入到Virtual.lab桥梁边界元模型中,求解连续梁的辐射噪声。通过时域分析与频域分析相结合的方法,分析桥梁结构声辐射时域声压、声压级变化以及声辐射的频谱特性。同时与振动数据对比,结果表明:桥梁结构的噪声声压时程与竖向振动加速度时程变化规律比较相似,两者几乎在同一时刻出现峰值;通过各跨声压级云图可以看出梁顶面和底面是噪声最大区域,桥梁两侧噪声沿水平方向衰减较大,而沿竖直方向变化并不明显;通过频域分析可以看出桥梁结构噪声主要以200 Hz以内的低频噪声为主,声压级在频域上的分布规律与竖向振动加速度频谱呈现一定的相似性。To explore the radiation noise cha racteristics of a continuous beam of an eleva ted line of urban rail transit and its impact on the surrounding env ironment,the train bridge coupled vibration theory is combined with the boundary element method for the acoustic rad iation analysis of the bridge structure.Tak ing a three span continuous variable cross-section box girder bridge of an elevated section of Beijing Metro Line 5 as the research object,a calculation program is compiled to solve the vibra tion response of the bridge,and the vertical vibration calculation results of each span are input into virtual In the lab br idge boundary element model,the radiation no ise of continuous beam is solved.Through the combination of time-doma in analysis and frequency-domain analysis,the time-domain sound pressure,sound pressure level changes and the spectrum characteristics of the sound radi ation of the bridge structure are analyzed.At the same time,compared with the vibration data,the results show that the time history of the noise pressure of the bridge structure is similar to the time history of the vertical vibration acceleration,and the two peaks almost at the same time;It can be seen from the cloud diagram of sound pressure level of each span that the top and bottom of the beam are the areas with the larg est noise,and the noise on both sides of the b ridge attenuates greatly in the horizontal direction,but does not change significantly in the vertical direction;It can be seen from the frequency domain analysis that the bridge structure no ise is mainly low-frequency noise within 200 Hz,and the distribution law of sound pressure level in the frequency doma in is similar to the vertical vibration accel eration spectrum.

关 键 词：城市轨道交通 车桥耦合 连续梁 振动响应 边界元法 辐射噪声 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]