Influence of Pantograph Components on the Contact Quality of the Overhead System for High Speed Trains

2010 ◽  
Author(s):  
J. Pombo ◽  
J. Ambrósio ◽  
M. Pereira
Keyword(s):  
High Speed ◽  
High Speed Trains

scholarly journals Effect of the turning characteristics of underfloor wheel lathes on the evolution of wheel polygonisation

2018 ◽  
Vol 233 (5) ◽  
pp. 479-488 ◽  
Author(s):  
Dabin Cui ◽  
Boyang An ◽  
Paul Allen ◽  
Ruichen Wang ◽  
Ping Wang ◽  
...  
Keyword(s):  
Fourth Order ◽  
High Speed ◽  
Higher Order ◽  
Ride Quality ◽  
Sustained Use ◽  
High Speed Trains ◽  
Cut Quality ◽  
Multiple Unit ◽  
Component Failures

During both running and wheel cut operations, wheels of railway vehicles and the friction rollers that support and drive the wheelset on a typical wheel cut lathe are subject to wear and hence are likely to develop out-of-round characteristics after sustained use. The resulting out-of-round wheels can significantly affect the ride quality and can potentially increase the incidence of fatigue-related component failures due to the resulting higher intensity loading cycles. Furthermore, the corresponding out-of-round characteristics of the lathe's friction rollers will continue to degrade the subsequent cut quality of wheels. For the analysis of the out-of-round characteristics caused by an underfloor wheel lathe used for the high-speed trains in China, a mathematical model based on a typical electric multiple unit (EMU) vehicle's wheelsets and their interactions with the wheel lathe friction rollers was established. Factors influencing the cut quality of the wheels, including the number of cuts, eccentricity forms of the friction rollers and the longitudinal spacing of the two rollers, have been analysed. The results show that two cuts can effectively remove the higher order polygon on the wheel surface. The eccentricity and phase angle of the friction rollers have no influence on the cut quality of higher order polygons, whereas they are the primary cause for the fourth-order polygons. The severity of the fourth-order polygon depends on the level and the phase of the eccentricity of the friction rollers. The space of the two rollers can also significantly affect the cut quality. Obtaining the theoretical and practical value for the maintenance of polygonised wheels using the underfloor lathe is the main outcome of this study.

scholarly journals A Fast Hybrid Beamforming Scheme for High-Speed Railway Communications

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 998
Author(s):  
Yu Xiao ◽  
Gang Qiu ◽  
Yafeng Wang
Keyword(s):  
High Speed ◽  
Low Complexity ◽  
Spectrum Efficiency ◽  
System Throughput ◽  
Quality Of Services ◽  
Communication Service ◽  
High Speed Railway ◽  
High Speed Trains ◽  
Hybrid Beamforming

With the increasingly demand for reliable mobile communication service in the high-speed railway (HSR) system, the service stability of HSR communication is of great concern in recent research. Focusing on ensuring the quality of services (QoS) and system throughput, massive multi-input multi-output (massive MIMO) and beamforming technologies have been widely applied. In this paper, aiming to minimize the communication outage probability (OP) and not to decrease spectrum efficiency (SE) too much, we propose a fast HBF (F-HBF) scheme for HSR communications. The proposed scheme uses a low-complexity beam-searching algorithm to trace high-speed trains in real time. The simulation results verify that the proposed scheme can significantly reduce OP without too much SE degradation.

scholarly journals The Influence of Controller Parameters on the Quality of the Train Converter Current

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
M. Brenna ◽  
F. Foiadelli ◽  
D. Zaninelli
Keyword(s):  
Traffic Control ◽  
High Speed ◽  
Control Structure ◽  
Pi Controller ◽  
Signaling System ◽  
Harmonic Content ◽  
High Speed Trains ◽  
Set Up ◽  
A Current

This paper presents a stability analysis of train converters in order to evaluate how the controller parameters affect the absorbed current. The new dynamic model presented in this paper is capable of considering the time-variant nature of the system for the correct tuning of the feedback proportional-integral PI controller, applying a current controlled modulation technique never used in high-power traction converters. The reduction of the harmonic content of the current absorbed by a converter employed at the input stage onboard high-speed trains is really important, considering the interaction with the signaling system set up for traffic control. A computer model of the converter, considering both the power and the control structure, has also been implemented in order to deliver a validated tool for the developed theoretical analysis.

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.

scholarly journals High-Speed Train Stop-Schedule Optimization Based on Passenger Travel Convenience

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Dingjun Chen ◽  
Shaoquan Ni ◽  
Chang’an Xu ◽  
Hongxia Lv ◽  
Simin Wang
Keyword(s):  
High Speed ◽  
Hybrid Genetic Algorithm ◽  
Economic Benefits ◽  
Operation Planning ◽  
Schedule Optimization ◽  
Passenger Travel ◽  
High Speed Trains ◽  
Specific Manifestation

The stop-schedules for passenger trains are important to the operation planning of high-speed trains, and they decide the quality of passenger service and the transportation efficiency. This paper analyzes the specific manifestation of passenger travel convenience and proposes the concepts of interstation accessibility and degree of accessibility. In consideration of both the economic benefits of railway corporations and the travel convenience of passengers, a multitarget optimization model is established. The model aims at minimizing stop cost and maximizing passenger travel convenience. Several constraints are applied to the model establishment, including the number of stops made by individual trains, the frequency of train service received by each station, the operation section, and the 0-1 variable. A hybrid genetic algorithm is designed to solve the model. Both the model and the algorithm are validated through case study.

scholarly journals Probability Detection for Heterogeneous Networks Using FODPSO with ACO Optimization in Tunnel Based High Speed Trains

2020 ◽  
Author(s):  
Priyanka S ◽  
Leones Sherwin Vimalraj S ◽  
Lydia J
Keyword(s):  
Wireless Communication ◽  
Heterogeneous Networks ◽  
Heterogeneous Network ◽  
High Speed ◽  
Optimization Techniques ◽  
Quality Of Services ◽  
Low Latency ◽  
Efficient Communication ◽  
High Speed Trains

Wireless communication on train is said to efficient when it has a good throughput and low latency. But the efficiency is reduced during underground tunnels and high speed trains. Heterogeneous network is said to be a network which is used to connect different kinds of network and hence it is said to be a efficient network. At times, it is found to be difficult to access the network. This problem can be overcome by using the optimization techniques such as FODPSO and ACO algorithm. It is proposed for optimizing the heterogeneous network by comparing different networks such as LTE, WiFi and WiMax. For efficient communication, the quality of services is important which should be maintained entire transmission.

Variation Simulation Considering Welding Distortion Applied in High-Speed Trains

2017 ◽  
Author(s):  
Zhimin Li ◽  
Limin Yao ◽  
Baowang Li
Keyword(s):  
High Speed ◽  
Side Wall ◽  
Tolerance Analysis ◽  
Angular Distortion ◽  
Welding Distortion ◽  
High Speed Train ◽  
High Speed Trains ◽  
Dimensional Variation ◽  
Variation Simulation

The high-speed trains are currently considered one of the most significant technological breakthroughs in passenger transportation for providing lower time-consuming and higher quality improvement services. Nevertheless, the manufacturing quality of high speed train is related to driving safety and riding comfort. It needs to be emphasized that the control of dimensional variation plays a crucial and irreplaceable role in today’s manufacturing processing which affect the quality of manufacturing. In this study, a variation simulation method considering both tolerance analysis with rigid assumption and welding distortion is developed to predict dimensional variation of the side wall of high-speed train during the assembly process. Firstly, the tolerance analysis with rigid assumption method is employed to simulate the dimensional variation when the parts of side wall are assembled together. Then, the finite element method (FEM) based on inherent strain is used to predict welding distortion including longitudinal shrinkage, transverse shrinkage and angular distortion. Finally, the results combining both tolerance analysis with rigid assumption and welding distortion are compared with actually measured results to identify the effectiveness of this method.

scholarly journals A Novel Harmonic Suppression Traction Transformer with Integrated Filtering Inductors for Railway Systems

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 473 ◽  
Author(s):  
Yuxing Liu ◽  
Jiazhu Xu ◽  
Zhikang Shuai ◽  
Yong Li ◽  
Yanjian Peng ◽  
...  
Keyword(s):  
High Speed ◽  
Harmonic Suppression ◽  
Railway Systems ◽  
Integrated Inductor ◽  
Harmonic Reduction ◽  
Practical Operation ◽  
Magnetic Decoupling ◽  
High Speed Trains ◽  
New Type

This study analyzes and evaluates the feasibility of a harmonic suppression traction transformer (HSTT) for harmonic reduction in railway systems. This new type of transformer can improve the power quality of railway systems by preventing high-frequency harmonic currents from injecting into the traction grid. As the physical size of available space in high-speed trains is strictly limited, low space-occupying filtering techniques are needed. Therefore, an HSTT with integrated filtering inductors (IFIs) capable of being implemented in regular trains is proposed. Taking advantage of the HSTT, a specially constructed inductive-capacitive-inductive (LCL)-type filter is used for harmonic suppression instead of a regular LCL-type filter. The proposed filter is composed of an integrated inductor, leakage inductor of the traction transformer, and an external filter capacitor. In this paper, we analyze the topology of the proposed system, construct a mathematical model to reveal the magnetic decoupling theory of IFIs, and discuss the design and calculation procedures of the HSTT with IFIs. The field circuit coupling simulation of the HSTT with IFIs is performed to validate the effectiveness of the proposed system. Finally, the practical operation based on a 10 kVA prototype shows that the proposed scheme can not only suppress the high-order frequency harmonics but also decrease the installed space of filter devices.

Battery Self-Traction System for High-Speed Trains

2020 ◽  
Vol 140 (5) ◽  
pp. 349-355
Author(s):  
Hirokazu Kato ◽  
Kenji Sato
Keyword(s):  
High Speed ◽  
High Speed Trains ◽  
Traction System
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