摘要
针对高速铁路钢轨扣件,结合其动态力学性能试验,基于高阶分数阶导数理论建立扣件动参数频变FVMP模型,并将该模型应用于车辆-轨道随机振动模型中,采用格林函数法及虚拟激励法分析扣件动参数频变对车辆及钢轨结构振动的影响。计算结果表明:扣件的动参数对频率和温度具有明显的依赖性,而高阶分数阶导数FVMP模型能准确表征这种力学行为;扣件动参数的频变特性对车体的垂向振动无较大影响,但对频率在20~70Hz范围内的转向架随机振动有一定影响;考虑扣件动参数频变特性后轮对与钢轨振动所受影响较大,轮对加速度功率谱密度在中频段的峰值相差64.2%,钢轨加速度功率谱密度在中频段的峰值相差55.2%;扣件FVMP模型得到的轮轨随机振动频域分布向高频偏移,且中高频段内轮轨振动响应减小;忽视扣件动参数随频率变化的特性将难以准确表征轮轨中高频段内的振动响应。
Targeting rail fastener of high-speed railway,based on the test of dynamic mechanical properties of fastener and the high-order fractional derivative theory,an FVMP model with frequency-dependent dynamic parameters of rail fasteners was established. The model was applied to the vehicle-track random vibration model. The effects of frequency-dependent dynamic parameters of fasteners on the vibration of vehicles and rail structures were analyzed by Green's function method and virtual excitation method. The results show that the dynamic parameters of fasteners are dependent on frequency and temperature,and the FVMP model can characterize the mechanical behavior. Despite little impact of frequency-dependent characteristics of fastener parameters on the vertical vibration of the train body,the frequency-dependent characteristics of fastener dynamic parameters have great influence on the random vibration of the bogie in the frequency range of 20 Hz to 70 Hz. Considering the frequency-dependent characteristics of fastener dynamic parameters,the vibration of rear wheelset and rail is greatly affected. The peak value of wheelset acceleration power spectral density differs by 64.2% in mid-frequency band and 55.2% in rail acceleration power spectral density in mid-frequency band. The frequency domain distribution of wheel-rail random vibration obtained by fastener FVMP model shifts to high frequency,while the vibration response of wheel-rail in medium and high frequency bands decreases. The vibration response of wheel-rail in medium and high frequency band can be hardly characterized accurately without considering the frequency-dependent characteristics of fastener dynamic parameters.
作者
刘林芽
卢沛君
秦佳良
LIU Linya;LU Peijun;QIN Jialiang(Engineering Research Center of Railway Environment Virbration and Noise, Ministry of Education,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2019年第5期93-100,共8页
Journal of the China Railway Society
基金
国家自然科学基金(51578238)
江西省重点研发计划(20181BBE50013)
关键词
扣件FVMP模型
动参数频变
车-轨耦合
格林函数法
随机振动
fastener FVMP model
frequency variation of dynamic parameters
vehicle-track coupling
Green function method
random vibration
