Analysis of dynamic interaction between catenary and pantograph with experimental verification and performance evaluation in new high-speed line

Understanding the dynamic interaction between the catenary and pantograph of a high-speed train is the one of the most important technical issues in the railway industry. This is because the catenary–pantograph system plays a crucial role in providing electric power to the railway vehicle for stable operation. The aim of the present paper is to estimate the current-collection performance of this system by using numerical analysis, in particular, the flexible multibody dynamic analysis technique. To implement large deformable catenary wires, an absolute nodal coordinate formulation is used for the cable element. Additionally, an efficient contact element and an interactive model for the catenary–pantograph system are introduced. Each developed model is then used for analytical and experimental verification. Actual on-line test results of existing high-speed railway vehicles are presented and used to verify the analysis model. Finally, the performance characteristics of a new 400 km/h-class high-speed line are estimated and evaluated on the basis of international standards.     

Dynamic assessment of existing soft catenary systems using modal analysis to explore higher train velocities: a case study of a Norwegian contact line system

Significant advances made on the rolling stock have considerably increased the possibility of higher speeds in existing railways. Thus, it is important to explore higher speeds and potential limiting factors of existing soft catenary systems. The present paper investigates procedures to assess the dynamic behaviour of these systems using response sampling and modal analysis. The assessment evaluates and quantifies dynamic response along the section. To verify the approach, a case study is conducted and the following assessment methods are used: lengthwise track correlation estimating dynamic predictability, power spectral density estimations before and after passage and short-time Fourier transforms and spectrograms. The combination provides detailed information on the dynamic behaviour. The first part introduces necessary considerations for suggested modal analysis. The second part describes an existing Norwegian section. The case study is conducted using a finite element model including a straight and a given section between Oslo-Trondheim, providing detailed evaluations and system limitation detections.     

基于坐席类型动态分配的旅客列车开行方案

为提高铁路部门服务质量和铁路旅客出行体验, 并制定可满足旅客需求多元化的旅客列车开行方案, 考虑坐席动态分配对旅客列车开行方案进行研究。从旅客和铁路运营部门2个角度出发, 分别以旅客动态乘车广义时间最短和铁路收益最大为目标, 以客流守恒、区间通过能力和满足客流需求等为约束建立多目标规划模型。通过Logit模型确定硬座、硬卧、软卧这3类坐席的分担率, 确定列车定员数, 并在求解过程中依据生成的开行方案不断更新3类坐席的分担率以实现3类坐席的动态分配, 直至结果趋于稳定。结合算例采用带精英策略的非支配排序遗传算法(NSGA-Ⅱ)求解, 并进行算例分析, 计算结果表明: 建立考虑坐席类型动态分配的旅客列车开行方案, 在实现旅客对坐席选择的同时, 铁路旅客服务率提高了3.5%, 铁路部门收益增大了1.5%。     

基于新旧动能转换背景车辆工程专业新能源汽车方向课程体系实施的保障措施 ——以青岛黄海学院为例

文章以青岛黄海学院为例,在对新能源人才现状及需求调研的基础上,设计面向"新旧动能转换"背景下的车辆工程专业新能源汽车课程体系,提出车辆工程专业新能源汽车方向课程体系的实施保障措施,以期培养出适应新能源汽车行业和企业发展需求的新能源汽车人才.