摘要
为解决有限截取长度轨道模型边界振动反射波的干扰问题,基于周期结构原理,建立无反射边界的有限元轨道模型,分析弹性短轨枕轨道的隔振性能、轨道各结构的声辐射特性,以及不同轨枕下支承刚度对其振动和声辐射特性的影响。结果表明:基于周期结构原理建立的轨道模型能够消除边界反射波的影响,从而准确地反映轨道的振动特性;弹性短轨枕轨道的隔振率在整个频率段稳定在1,同普通板式轨道相比具有较为优良的隔振性能;弹性短轨枕轨道的总辐射噪声频率为0~240 Hz,轨下结构为主要贡献源,在频率高于240 Hz时钢轨成为轨道总辐射声功率的主要贡献源,在频率为1 020 Hz时轨道总声功率出现峰值,这与钢轨的Pinned-Pinned共振有关;为兼顾弹性短轨枕轨道的减振和降噪性能,轨下支承刚度应为40~160 MN·m-1。
In order to solve the interference problem of the reflected wave caused by the boundary vibration of the track model with finite intercept length, a finite element track model without reflecting boundary was established based on periodic structure principle. The vibration isolation performance of the elastic short sleeper track and the acoustic radiation characteristics of each structure of the track, and the influence of the support stiffness under different sleepers on the vibration and acoustic radiation characteristics were analyzed. Results show that the track model based on the periodic structure principle can eliminate the influence of boundary reflected wave, so as to accurately reflect the vibration characteristics of the track. The vibration isolation rate of the elastic short sleeper track is stable at 1 in the whole frequency range, and it has better vibration isolation performance than the ordinary slab track. The total radiated noise frequency of the elastic short sleeper track is0~240 Hz, the structure under rail is the main contribution source. When the frequency is higher than 240 Hz,the rail becomes the main contribution source of the total radiated sound power of the track. When the frequency is 1 020 Hz, the total sound power of the rail has a peak value, which is related to the Pinned-Pinned resonance of the rail. In order to give consideration to the vibration and noise reduction performance of the elastic short sleeper track, the support stiffness under the rail should be 40~160 MN·m-1.
作者
徐涆文
韩健
刘晓龙
田彩
梁树林
陈秉智
XU Hanwen;HAN Jian;LIU Xiaolong;TIAN Cai;LIANG Shuling;CHEN Bingzhi(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu Sichuan 610031,China;College of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian Liaoning 116028,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第5期37-45,共9页
China Railway Science
基金
国家重点研发计划项目(2017YFB1201103)
四川省科技计划项目(2019YFH0053)。
关键词
弹性轨枕轨道
有限元
周期结构原理
边界
反射波干扰
隔振
声辐射特性
Elastic sleeper track
Finite element method
Periodic structure principle
Boundary
Reflected wave interference
Vibration isolation
Acoustic radiation characteristics
