摘要
为研究城市轨道交通所引起的高架结构的振动及声辐射水平,采用有限元方法分别建立了连续梁桥的三维振动分析模型及二维声场分析模型,计算了当列车以60 km/h的速度通过时桥梁的动力响应及辐射声压。通过频谱分析,声压频谱峰值除在160 Hz附近出现一个明显的峰值外,与振动频谱分布基本相同。相干性分析结果表明,连续梁桥控制90 Hz以内的振动,将直接有效的控制辐射声压水平。通过改变桥梁阻尼、支座刚度、行车速度和车辆荷载等参数,计算分析了各参数对结构振动与噪声的影响程度。
In order to study the vibration response and radiated noise of elevated structures subjected to moving trains,a 3D vibration model and a 2D sound field model for simply supported girder were established by FEM.The dynamic response and radiated noise of the girder were calculated,with a train running at a velocity of 60km/h.The result shows that the frequency spectra of noise and vibration are similar,except that there is an obvious peak near 160Hz in noise spectrum.The coherence analysis of the spectra shows that,the influence of radiated noise on environment can be effectively controlled by adjusting the vibration components below 90Hz of the girder.The influences of parameters,such as structural damping,support stiffness,vehicle speed and vehicle loading,upon the vibration response and radiated noise were analyzed by changing the parameters.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第4期72-76,共5页
Journal of Vibration and Shock
基金
北京市自然科学基金资助项目(8082021)
高等学校博士学科点专项科研基金(20090009120021)
关键词
轨道交通
高架结构
振动与噪声
railway
elevated structure
vibration and noise
