中南大学学报（自然科学版）2023，Vol.54Issue(11)：4573-4583,11.DOI:10.11817/j.issn.1672-7207.2023.11.034
考虑扣件系统非线性力学行为的车辆与轨道动力分析模型
Dynamic analysis model of vehicle and track considering nonlinear mechanical behavior of fastening system
摘要
Abstract
In order to in-depth study the mechanical characteristics of the fastening system and the impact of damage and failure on the vibration of the wheel-rail system,the nonlinear mechanical characteristics of the fastening bar-spring clip and the rubber pad under the rail were revealed based on the refined finite element model of the fastening system.A detailed vehicle and track dynamic analysis model considering the vertical nonlinear mechanical behavior of the fastening system was proposed and established.The reliability of the model is verified by the field measurement results,and the effects of different failure types of fastening system on the dynamic response characteristics of the wheel-rail system were analyzed.The results show that the clamping force is approximately bilinear with the increase of the deflection of the clip,0.675 kN/mm in the state of"2-point contact",and 5.11 kN/mm in the state of"3-point contact".The frequency components of the rail acceleration response in the region above 100 Hz are more abundant calculated by this model.The traditional model uses the stiffness attribute to reduce or remove the spring element to simulate the failure of the fastening bar-spring clip,which will amplify the dynamic response of the wheel-rail system near the failure area.In view of fastening system failure,including clip failure and rail pad failure,attention should be paid not only to the track structure state in the failure area,but also to the rear adjacent area in time during actual on-site operation and maintenance.关键词
扣件系统/非线性力学行为/动力分析模型/扣件失效/振动特性Key words
fastening system/nonlinear mechanical behavior/dynamic analysis model/fastening failure/vibration characteristic分类
交通工程引用本文复制引用
马登科,时瑾,王英杰..考虑扣件系统非线性力学行为的车辆与轨道动力分析模型[J].中南大学学报（自然科学版）,2023,54(11):4573-4583,11.基金项目
国家自然科学基金资助项目(52078035,52178406)(Projects(52078035,52178406)supported by the National Natural Science Foundation of China) （52078035,52178406）
