摘要
利用配有温度箱的万能力学试验机,结合温频等效原理与WLF方程的分数阶Zener模型,测试与表征Vossloh300钢轨扣件弹性垫板随频率非线性变化的黏弹性动力性能,并基于有限元方法研究考虑胶垫频变特性对钢轨垂向振动及传递衰减的影响规律。研究结果表明:在双对数坐标系下,扣件胶垫刚度和阻尼系数与频率近似呈线性正相关和负相关。胶垫阻尼频变主要增强中低频范围内的钢轨垂向振动,并能激发出钢轨1阶垂向共振频率;胶垫刚度频变能更准确预测钢轨1阶垂向共振频率;而胶垫频变特性对钢轨pinned-pinned共振频率无影响。考虑胶垫频变特性后,在1阶垂向共振频率以下,钢轨振动在激振点附近快速衰减,超过该频率钢轨振动主要沿钢轨纵向衰减。
In this paper, the frequency-dependent dynamic properties of the rail pad of the Vossloh 300 fastener were tested by universal mechanic machine and temperature box, which characterized by the temperature- frequency equivalent principle and the fractional-order Zener model of the WLF equation. Then the influence of the frequency-dependent properties of the rail pad on the vertical vibration and transmission attenuation of the rail was analyzed based on the finite element method. The results show that: In the double logarithmic coordinate system, the stiffness and damping coefficient of the rail pad are linearly positively or negatively correlated with the frequency. The frequency-dependent damping of the rail pad mainly enforces the vertical vibration of the rail in the middle and low frequency range, which excites the first-order vertical resonance frequency of the rail. The frequency-dependent stiffness of the pad can predict the first-order vertical resonant frequency of the rail more accurately. The pinned-pinned resonance frequency of the rail is not affected by the frequency change characteristics of the pad. Considering the frequency-dependent dynamic properties of the rail pad, the rail vibration below the first-order resonance frequency of rail could reduce near the excitation point, while high frequency vibration of rail will not attenuate rapidly and spread along the rail in a long distance.
作者
王绍华
韦凯
杨敏婕
胡小刚
WANG Shaohua;WEI Kai;YANG Minjie;HU Xiaogang(MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第4期892-899,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51608460
51578468)
关键词
扣件胶垫
频变特性
钢轨振动
位移导纳
衰减率
rail pad
frequency-dependent dynamic properties
rail vibration
displacement admittance
decay rate
作者简介
通信作者:韦凯(1980-),男,山西临汾人,研究员,博士,从事轨道系统动力学及环境振动噪声问题研究.E-mail:wei_mike@163.com.
