摘要
建立无砟轨道系统高频振动边界元模型,运用有限元和边界元相结合的方法,将已经计算出的轨道系统垂向高频振动响应作为声辐射计算边界条件,得到钢轨与轨下结构的声辐射特性。分析结果表明:钢轨和轨道板对噪声的贡献量中,在800～3 000 Hz时主要是以钢轨的声辐射为主,在0～500 Hz时主要以轨道板的声辐射为主;随着距离的增长,轨道系统的声辐射呈线性递减趋势;钢轨部位声辐射要比轨道板部位的显著,平均大15 dB左右,轨腰的声辐射量要比钢轨其他部位的显著。本文预测轨道系统噪声的结果与其它模型得出的结果都有很好的一致性,说明本文的模型与做法是合理可行的,为以后的铁路减振降噪提供了理论依据。
The boundary element model of unballasted track track system to high frequercy vibration calculated by means system was established. The dynamic response of of FEM combined with BEM method was taken as the calculation boundary condition of acoustic radiation, thus, the acoustic radiation charateristics of the rail and rail structure were obtained. The results show that between 800-3 000 Hz, the noise mainly comes from the a- coustic radiation of steel rails, and between 0-500 Hz, the noise mainly comes from that of slab tracks. With the increase of the distance, acoustic radiation of track system appears to decrease linearly, moreover the acous-tic of steel rails is more obvious than that of slab track, which is almost more than 15 dB, and the acoustic radia-tion of waist rail is more obvious than that of other parts of steel rails. This paper＇ s prediction of the result of track system＇ s noise is consistent with that Of other models very well. It indicates the reasonableness and feasibil-ity of the model and the practice, thus provides theoretical basis for further damping of noise and vibration of rail-ways.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第1期1-5,共5页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51068007
51268014)
关键词
无砟轨道
有限元法
边界元法
钢轨
轨道板
声辐射特性
ballastless track
finite element method
boundary element method
rail
slab tracks
acoustic radi-ation characteristics
