摘要
为研究焊接接头不平顺演变对车辆-轨道动态相互作用的影响,现场跟踪测试得到不同服役时期的焊接接头不平顺数据,并利用车辆-轨道垂向耦合动力学模型,从时域和频域两个角度,分析计算了不同服役时期焊接接头不平顺对车轮、钢轨振动加速度及轮轨垂向力的影响.分析结果表明：焊接接头不平顺演变分为马鞍形凹陷形成阶段及焊缝区域内磨损加速阶段;焊接接头不平顺几何形态的演变对时域内轮轨动态响应结果影响显著,随着焊接接头不平顺几何形态演变,轮轨动态响应结果呈先增大后减小再增大的趋势;焊接接头不平顺几何形态演变对轮轨动态响应的频域分布影响较小,轮轨动态响应功率谱密度图中存在明显两个频段,分别为低频段31~35 Hz及高频段530~610 Hz,高频段具体位置和焊缝区域内不平顺几何形态联系紧密.
In order to investigate the effect of the rail weld irregularity geometry evolution on the wheel-rail dynamic interactions,follow-up field test was carried out to obtain the data of weld irregularities during different service periods.Focused on the wheel-rail dynamic response caused by the rail weld irregularity geometry in different periods of time,the vertical vehicle-track dynamic interaction model was established to analyze in time and frequency domain.Analysis results show that the process of rail weld irregularity geometry evolution is divided into two stages,which are the formation stage of depressed saddle-shaped and the accelerated stage of wear in the weld area.The geometry evolution of rail welded irregularity has great effects on the wheel-rail dynamic interactions in time domain.At the beginning the wheel-rail dynamic response increases,then decreases,and finally increases.The geometry evolution of rail welded irregularity has a little effect in frequency domain.There are two main frequency ranges existing in the PSD spectrum of wheel rail dynamic response density,including the low frequency range of 31~35 Hz and the high frequency range of 530~610 Hz.The position of high frequency is closely related to geometry evolution of rail welded irregularity.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第1期98-103,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家杰出青年科学基金资助项目(51425804)
国家自然基金资助项目(51378439,51608459)
中国铁路总公司科技研究开发计划资助项目(2015G006-C,2016G008-D)
关键词
重载铁路
钢轨
焊接接头不平顺
几何形态演变
轮轨动态作用
时频域分析
heavy haul railway
rail
weld irregularity
geometry evolution~ wheel-rail dynamic interaction
time-frequency analysis
