摘要
本文通过建立无缝线路有限元动力分析模型,研究了钢轨自振频率和温度力之间的关系。该动力模型包括钢轨模型,钢轨扣件模型,轨枕模型,考虑了钢轨断面特性,钢轨磨耗,轨下刚度以及扣件的弹性刚度和扭转刚度等因素对动力模型计算的影响。分别分析了钢轨磨耗,轨枕支承间距,扣件刚度,钢轨类型以及轨下刚度等参数改变的情况下,钢轨纵向力变化对钢轨振动特性的影响。对部分的计算数据与实际试验测得的数据进行比较分析后,发现通过有限元方法所建立分析模型的计算结果与现场测试结果对比有较好的吻合,采用所建立的计算模型可以更准确地分析无缝线路轨道结构中钢轨纵向力与振动特性的内在联系。
A dynamic computational model for analyzing the relationship between rail nature frequencies and the longitudinal temperature force of continuous welded rail track by means of finite element method was presented. The rail, fastener, sleepers and foundation stiffness were considered in the system. The section characteristic and wear of rail, spring with elastic and rotational stiffness of the fasteners were also adopted in the model. Based on the model, the numerical and computational formulate were induced and programmed. The relation of the rail longitudinal temperature force versus nature frequencies was studied. The influences of parameters varying, such as wear of rail, supporting distance of adjoining sleepers, fastener stiffness, rail types and foundation stiffness were investigated. After comparing the analyzing results and the field measurement results, it shows that the agreement between the computational results of finite element model and the field measurement results is relatively better, which is to say that the computational model can analyze the inherent relation between the longitudinal force of continuous welded rail track and vibration characteristics more accurately.
出处
《力学季刊》
CSCD
北大核心
2008年第2期284-290,共7页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(50378070)
关键词
无缝线路
动力特性
纵向力
有限元模型
continuous welded rail track
dynamic characteristic
longitudinal temperature force
finiteelement method
