scholarly journals Analysis of Effect of Pantograph Cover on the Current Collection Quality of High Speed Train using Real Train Experiment

2016 ◽  
Vol 19 (4) ◽  
pp. 409-416
Author(s):  
Hyuck Keun Oh ◽  
Seogwon Kim ◽  
Yong-hyun Cho ◽  
Minho Kwak ◽  
Sam Young Kwon
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Current Collection

Influence of a high-speed train passing through a tunnel on pantograph aerodynamics and pantograph–catenary interaction

2016 ◽  
Vol 231 (2) ◽  
pp. 198-210 ◽  
Author(s):  
Ruiping Li ◽  
Weihua Zhang ◽  
Zhou Ning ◽  
Binbin Liu ◽  
Dong Zou ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Aerodynamic Drag ◽  
Contact Forces ◽  
Blockage Ratio ◽  
High Speed Train ◽  
Aerodynamic Forces ◽  
Current Collection ◽  
Uplift Forces

Aerodynamics of trains running inside tunnels change more significantly in comparison with open air scenarios. It has been confirmed that the lateral vibration as well as the aerodynamic drag of the trains is increased and the micro-pressure wave is produced at the tunnel exit when the trains are passing through tunnels. The aim of this article is to explore the impact of a high-speed train passing through a tunnel on the pantograph aerodynamics and the dynamic behavior of the pantograph–catenary interaction. The aerodynamic forces acting on the pantograph are investigated thoroughly by extensive numerical simulations as well as systematic field tests. To investigate the effects of the aerodynamic forces of pantograph on the quality of current collection, the numerical simulations of the pantograph–catenary dynamic interaction are conducted with our proposed model, taking into consideration the action of the aerodynamic uplift forces obtained by the numerical simulations on the pantograph. Then, a series of numerical simulations are also carried out to analyze the effects of the train speed and the blockage ratio on the aerodynamic uplift forces of the pantograph, on the contact forces, as well as on the displacement of the contact wire, while the train is passing through a tunnel. The results reveal that compared with the open air scenarios, the aerodynamic drag and uplift forces of the pantograph, the mean value of the contact force and the displacement level of the registration arm can considerably increase as the train runs inside a tunnel. Moreover, the statistical values of the contact forces and the displacement level of the contact wire become larger while the train is passing through the tunnel at different speeds. On the other hand, the quality of current collection decreases with the increasing of the blockage ratio.

Computer Evaluation of Controlled Pantographs for Current Collection From Simple Catenary Overhead Equipment at High Speed

1983 ◽  
Vol 105 (4) ◽  
pp. 287-294 ◽  
Author(s):  
T. Vinayagalingam
Keyword(s):  
Contact Force ◽  
High Speed ◽  
Overhead Line ◽  
Combined System ◽  
Current Collection ◽  
Constant Height ◽  
Force Profile ◽  
Force Variation ◽  
Computer Simulation Technique

A digital computer simulation technique is used to study the effects of changing pantograph characteristics upon the quality of current collection from simple catenary overhead equipment at high speed. In particular, the likely benefits to be derived by the use of controlled pantographs are assessed. Pantograph performance is judged on the basis of contact force variation and displacement responses of pantograph and contact wire. These studies have shown that the dynamic displacements of the combined system are determined primarily by the overhead line parameters rather than by the pantograph. At higher speeds droppers in the vicinity of the pantograph slacken and this is seen to influence significantly the contact force profile. On a “constant height” overhead line, the proposed “frame compensated” and “panhead inertia compensated” pantographs do not show any marked improvement in the quality of current collection.

Active Control of Fuzzy for High-Speed Pantograph

2012 ◽  
Vol 251 ◽  
pp. 158-163 ◽  
Author(s):  
Gang Yang ◽  
Zhong Mei Dai ◽  
Fu Li ◽  
Zheng Zhi Luo
Keyword(s):  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
Fuzzy Controller ◽  
Current Collection ◽  
Maximum Value ◽  
Dynamic Performances ◽  
Catenary System ◽  
The Impact

The regular current collection is very important for high-speed train， and can be obviously improved by the use of active control. In order to study the impact of the fuzzy active control on pantograph-catenary system, the model ohe simulation model is created with the software of simulink. Finally the influences of fuzzy active control on dynamic performances and quality of current collection of the pantograph-catenary system are analyzed. It seems that, the performances of the system with or without active control is established, the fuzzy controller is constructed, and tf the pantograph- catenary system can be improved obviously under the fuzzy active control, the maximum value of the contact force is reduced to 50 percent, the minimum is increased to 80 percent, and the fluctuation extent of the contact force is reduced to 70 percent.

Study on Evaluation Method of High-Speed Train Based on Bipartite Graph

2013 ◽  
Vol 364 ◽  
pp. 843-848
Author(s):  
Ling Xuan Li ◽  
Yuan Yua Ma ◽  
Zi Liang Liu
Keyword(s):  
Resource Allocation ◽  
Bipartite Graph ◽  
High Speed ◽  
Evaluation Method ◽  
High Speed Train ◽  
Key Factors ◽  
Performance Indices ◽  
High Speed Trains ◽  
High Influence

Based on the resource allocation method of bipartite graph projected to one-mode graph, the bipartite graph network is established using six evaluating comfortableness indices and seven subsystems of high-speed train as the vertices. Our research shows that: This method can be used to find out the key factors which have high influence on the high-speed trains comprehensive comfortableness; also its ratio can be obtained. The overall quality of the high-speed train also can be forecasted by this method if the seven subsystems performance indices are given. Meanwhile, the interacting dependency level among the indices can be obtained.

The Performance Analysis of Different Topology Structures of High-Speed Train Based on Industrial Ethernet

2014 ◽  
Vol 687-691 ◽  
pp. 2379-2382
Author(s):  
Chong Hui Ren ◽  
De Qiang He
Keyword(s):  
Network Topology ◽  
Network Structure ◽  
High Speed ◽  
Reference Value ◽  
Industrial Ethernet ◽  
High Speed Train ◽  
Network Topologies ◽  
Application Data ◽  
Ladder Network

The industrial Ethernet technology has been gradually applied to the high-speed train. However, different network topologies can have big impact on the quality of communication. The real-time and reliability performances of the high-speed train to which three kinds of network topology structures of the linear, the ring and the ladder are applied based on industrial Ethernet are analyzed in theory according to IEC61375(2009). Four kinds of application data are built to modify the data transmission in this paper. The three structures are simulated with the OPNET modeler. Afterwards, the network performances are compared in the simulation. At last, a conclusion that the performance of the ladder network structure is superior to that of the linear and the ring network structure is drew. The results of the study could provide the reference value of the construction and majorization of the network topology structure based on the industrial Ethernet.

The Effect of Single Pulse, Double Pulse and ForceArc MIG Welding Technology on Mechanical Properties of Welding Joint for 5083 Aluminum Alloy Used in High-Speed Train Body

2011 ◽  
Vol 337 ◽  
pp. 460-465
Author(s):  
Lei Su ◽  
Yuan Nie ◽  
Hua Ji ◽  
Chuan Ping Ma ◽  
Shao Hua Yan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
High Speed ◽  
Single Pulse ◽  
Double Pulse ◽  
High Speed Train ◽  
Welding Joint ◽  
5083 Aluminum Alloy ◽  
Very High

The technology of lightening manufacture for aluminum alloy train body is one key of manufacturing high-speed train . The train body is a whole bearing loading tubular structure which is welded together by the large, hollow, thin-walled aluminum extrusion. Therefore，the demand for welding quality of aluminum alloy train body is very high，and the mechanical properties of joints severely affected the overall strength of welded components. To solve this problem ,we use the 421 EXPERT forceArc MIG of PHOENIX series of German EWM company to perform three types of experiments of single pulse, double pulse, and forceArc welding ,and then effect of three welding methods on mechanical properties of Welding joint for 5083 aluminum alloy used in high-speed train body is compared.

Research on the Failure Mechanism of Flash Welded Rail

2011 ◽  
Vol 314-316 ◽  
pp. 1100-1106
Author(s):  
Yong Hui Zhu ◽  
Hui Chen ◽  
Zhong Yin Zhu ◽  
Chuan Ping Ma ◽  
Li Jun Wang ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
High Speed ◽  
Fatigue Cracking ◽  
High Speed Train ◽  
Joint Fracture ◽  
Calcium Aluminates ◽  
Welding Joints ◽  
Train Safety ◽  
Flash Welding

For the high speed train, safety is the most important factor. Flash welding is the primary technology for the seamless line rail in Chinese railway. So the quality of the flash welded joints is the most important. This paper presents the situation of joint fracture in rail flash welding joints and analyses the failure mechanism through macroscopic and microscopic observation. The result demonstrate that the cracking of the rail is fatigue-crack propagation，the fatigue cracking is caused by alumina calcium-Aluminates-non-metallic inclusion．

Sound insulation quality of the windows for high speed train

2003 ◽  
Vol 2003.12 (0) ◽  
pp. 37-40 ◽  
Author(s):  
Masahiko HORIUCHI ◽  
Katufumi HASHIMOTO ◽  
Hitoshi SHIRAISHI ◽  
Satoru AKIYAMA ◽  
Yasufumi MINAMIMOTO
Keyword(s):  
High Speed ◽  
Sound Insulation ◽  
High Speed Train ◽  
Insulation Quality

Reliability Allocation for a System with Complex Redundancy

2013 ◽  
Vol 436 ◽  
pp. 505-510 ◽  
Author(s):  
Zdenek Vintr ◽  
Tomas Vintr
Keyword(s):  
High Speed ◽  
Suggested Method ◽  
Parallel Structure ◽  
Proper Function ◽  
High Speed Train ◽  
Practical Application ◽  
Specific System ◽  
Reliability Allocation ◽  
Current Collection ◽  
Minimum Number

The paper deals with the possibilities of allocating reliability requirements for a system using complex redundancy. It means system consists of a few identical subsystems and for its common function it is quite enough if only certain part of these subsystems operates. The subsystems not operating at a certain moment serve as redundancy in case that the subsystems which are operating fail. All the system, however, is not a trivial parallel structure, because if the system is to work properly, always more than one subsystem should operate and the subsystems can function only in configurations set in advance. Practical application of the suggested method of reliability allocation is demonstrated for a pantograph system of a high-speed train. In order to provide the proper function of the system, the minimum number of operating pantographs in pre-set configurations providing safe current collection has to be always available. Using some pantograph configurations (e.g. two pantographs being one after another very closely) is in fact not possible for safety reasons. The article presents the procedure of reliability allocation for this specific system. Suggested method is based on a truth table and Boolean algebra application.

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