Compliant Variation Analysis for High-Speed Train With Consideration of Welding Distortion

2018 ◽  
Author(s):  
Tao Liu ◽  
Yongjun Li ◽  
Baowang Li ◽  
Zhimin Li ◽  
Limin Yao ◽  
...  
Keyword(s):  
High Speed ◽  
Manufacturing Industry ◽  
Structural Deformation ◽  
Angular Distortion ◽  
Welding Distortion ◽  
Variation Analysis ◽  
Analysis Model ◽  
Variation Propagation ◽  
High Speed Trains ◽  
And Performance

An important goal of the manufacturing process is to achieve high accuracy and reliability of products. For modern equipment manufacturing industries, such as high-speed trains (HST), the assembly performance is guaranteed by the product design and manufacturing technique. Since dimensional control is much related to manufacturing quality, assembly variation analysis methods play an increasingly crucial role in advanced manufacturing industry. Nevertheless, the relationship between welding distortions and tolerance design has not been considered in most existing assembly variation analysis models, which lack of quantitative analysis between precision and performance. In this study, a compliant variation analysis methodology considering both static structural deformation and welding distortion is developed and applied to predict assembly variation of the roof of HST. Firstly, welding simulation is carried out to predict welding shrinkage and angular distortion with different welding configurations. Then, welding distortion is equivalent to dimensional variation and considered in the compliant variation analysis model with offset tolerance technique. Finally, a compliant variation simulation is carried out to investigate the variation propagation influence of welding shrinkage and distortion on the final dimension of assembly. The presented methodology provides an efficient tool for variation analysis of HST, also offers a theoretical basis and experimental support for mechanical properties of compliant assembly.

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.

Analysis Model of Ground Vibration Propagation for High-Speed Trains

2011 ◽  
Author(s):  
Yit-Jin Chen ◽  
Shiu-Shin Lin ◽  
Yi-Jiun Shen ◽  
Song-Wei Lin ◽  
Jia-Rong Lu
Keyword(s):  
High Speed ◽  
Ground Vibration ◽  
Analysis Model ◽  
High Speed Trains

Optimization on Resource-Constrained Multi-Project Scheduling of Electric Multiple Unit Overhaul

2013 ◽  
Vol 748 ◽  
pp. 457-462
Author(s):  
Peng Sun ◽  
Tian Yun Shi ◽  
Wei Jiao Zhang
Keyword(s):  
High Speed ◽  
Regular Production ◽  
High Speed Trains ◽  
Business Requirement ◽  
Multiple Unit ◽  
Dynamic Resource ◽  
Task Splitting ◽  
And Performance ◽  
Soft Precedence Constraints ◽  
Multiple Units

As the numbers and running distance of Chinese high-speed trains increase, many electric multiple units (EMU) gradually enter into overhaul stage, EMU maintenance bases face challenges of transition from practical exploration, regular production to lean production. In accordance of business requirement, built a model of dynamic resource allocation, task splitting, and soft precedence constraints. By the design of nonlinear decline inertia weight factor, a refined particle swarm optimization (PSO), as well as the corresponding parallel transformation scheme from particle to schedule, is presented. Finally, computational analysis is performed to validate the model and algorithm on optimization capabilities, resource utilization and performance.

scholarly journals Effect of Increasing Lateral Resistance of Ballastless Bridge Sliding Track Panel System by Installation of Reinforcement Plate

2021 ◽  
Vol 21 (5) ◽  
pp. 27-31
Author(s):  
Jongchan Park ◽  
Nam-Hyoung Lim
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
Essential Elements ◽  
Additional Stress ◽  
Analysis Model ◽  
Element Analysis ◽  
Essential Condition ◽  
Lateral Resistance ◽  
High Speed Trains ◽  
Minimum Requirements

Recently, train speeds have been increased in Korea owing to the expansion of Korea Train eXpress (KTX) operations and development of next-generation high-speed trains. Hence, continuous welded rails (CWRs) that affect the running stability and ride comfort of trains have become essential elements. However, it is difficult to install CWRs on most of the non-ballast bridges constructed since the 1900s owing to the rail additional stress that occurs during installation. As a solution to this problem, the sliding track panel (STP) system that allows longitudinal sliding is proposed. In the application of STP systems, securing the lateral buckling strength is an essential condition. Hence, a finite element analysis model considering the STP system is presented, and the necessity for reinforcement plates is investigated through a pure skeleton-track analysis. The minimum requirements and effects of increasing the stiffness of the reinforcement plates are derived by analyzing the lateral reinforcement plates.

EFFECT OF TRUCK COLLISION ON DYNAMIC RESPONSE OF TRAIN–BRIDGE SYSTEMS AND RUNNING SAFETY OF HIGH-SPEED TRAINS

2013 ◽  
Vol 13 (03) ◽  
pp. 1250064 ◽  
Author(s):  
CHAOYI XIA ◽  
HE XIA ◽  
NAN ZHANG ◽  
WEIWEI GUO
Keyword(s):  
Dynamic Response ◽  
High Speed ◽  
Dynamic Responses ◽  
Illustrative Case ◽  
Analysis Model ◽  
Box Girders ◽  
Running Safety ◽  
High Speed Trains ◽  
Safety Indices

A dynamic analysis model is established for a coupled high-speed train and bridge system subjected to collision loads. A 5 × 32 m continuous high-speed railway bridge with PC box girders is considered in the illustrative case study. Entire histories of a CRH2 high-speed EMU train running on the bridge are simulated when the truck collision load acts on the bridge pier, from which the dynamic responses such as displacements and accelerations of the bridge, and the running safety indices such as derailment factors, offload factors and lateral wheel/rail forces of the train are computed. For the case study, the running safety indices of the train at different speeds on the bridge when its pier is subjected to a truck collision with different intensities are compared with the corresponding allowances of the Chinese Codes. The results show that the dynamic response of the bridge subjected to truck collision loads is much greater than the one without collision, which can drastically influence the running safety of high-speed trains.

The Realization of Low Stress and Nonangular Distortion by Double-Sided Double Arc Welding

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
Hua-Jun Zhang ◽  
Guang-Jun Zhang ◽  
Chun-Bo Cai ◽  
Hong-Ming Gao ◽  
Lin Wu
Keyword(s):  
Residual Stress ◽  
Arc Welding ◽  
Manufacturing Industry ◽  
Welding Residual Stress ◽  
Angular Distortion ◽  
Welding Distortion ◽  
Transient Temperature ◽  
Lower Stress ◽  
Arc Distance ◽  
Good Agreement

Control welding residual stress and distortion is extremely important in manufacturing industry. Double-sided double arc welding (DSDAW), which can control residual stress and angular distortion, is developed. Because arc distance between fore and rear torches is the key effective factor of angular distortions in DSDAW, its effects are not clear on the stress and angular distortions. In this study, numerical simulation is used to predict the transient temperature and welding distortion and stress with different arc distances. Meanwhile, the transient temperature and angular distortion are measured. The calculated results are in good agreement with the experimental results. The effects of arc distance on the angular distortion and stress are investigated. Lower stress and nonangular distortion is obtained at arc distances of 0 mm and 50 mm.

Modal Analysis on Rotor of Asynchronous Traction Motor Used in High-Speed Trains

2013 ◽  
Vol 274 ◽  
pp. 374-377
Author(s):  
Si Chen ◽  
Fang Wang ◽  
Jun Ci Cao
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Traction Motor ◽  
Simulation Research ◽  
Operating Environments ◽  
High Speed Trains ◽  
Asynchronous Traction Motor ◽  
Safety Operation

According to the suffered various impacts and vibrations of traction driving part in high-speed train under complex operating environments and conditions, the modal problems in the rotor of traction motor, power output device in traction transmission system, working in high-speed trains is investigated. In this paper, a Finite Element Analysis model for rotor modal simulation research is established, by using which the influences of structure parts on motor natural frequency is analyzed. From the simulation analysis, the natural frequencies, the vibration mode and the amplitude of each order modes are obtained, which could provide a theoretical basis for the rapid, stable and safety operation of high-speed trains.

Multi-physics analysis of a novel circular pantograph catenary system for high-speed trains

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Song Xiao ◽  
Yuanpei Luo ◽  
Jingchi Wu ◽  
Can Zhang ◽  
Yang Rao ◽  
...  
Keyword(s):  
High Speed ◽  
Electrochemical Corrosion ◽  
Superior Performance ◽  
Technical Solution ◽  
Content Type ◽  
Continuous Contact ◽  
High Speed Trains ◽  
Catenary System ◽  
And Performance ◽  
Physics Model

Purpose In high-speed trains, the energy is supplied from a high voltage catenary to the vehicle via a pantograph catenary system (PCS). Carbon pantograph strips must maintain continuous contact with the wire to ensure safety and reliability. The contact is often confined to a particular spot, resulting in excessive wear due to mechanical and thermal damage, exacerbated by the presence of an electric arc and associated electrochemical corrosion. The effectiveness and reliability of the PCS impacts on the performance and safety of HSTs, especially under high-speed conditions. To alleviate some of these adverse effects, this paper aims to propose a configuration where a circular PCS replaces the currently used pantograph strips. Design/methodology/approach Two dynamic multi-physics models of a traditional PCS with a carbon strip and a novel PCS with a circular pantograph strip catenary system are established, and the electrical and mechanical characteristics of these two systems are compared. Moreover, a PCS experimental platform is designed to verify the validity and accuracy of the multi-physics model. Findings A novel circular pantograph system is proposed in this paper to alleviate some of the shortcomings of the traditional PCS. Comparing with a traditional PCS, the circular PCS exhibits superior performance in both electromagnetic and thermal aspects. Originality/value The paper offers a new technical solution to the PCS and develops a dedicated multi-physics model for analysis and performance prediction with the aim to improve the performance of the PCS. The new system offers numerous benefits, such as less friction heat, better heat dispersion and improved catenary-tracking performance.

An Actively Controlled Hydraulic Carbody Centering System for the Lateral Suspensions of High Speed Trains

2009 ◽  
Author(s):  
Giovanni Jacazio ◽  
Alberto Magnani ◽  
Laura Gastaldi ◽  
Gualtiero Balossini
Keyword(s):  
High Speed ◽  
Fast Response ◽  
Control Law ◽  
System Control ◽  
Test Results ◽  
Damped Oscillations ◽  
Innovative Solution ◽  
High Speed Trains ◽  
And Performance ◽  
Actuation Systems

High speed trains normally use pneumatic actuation systems to recenter the carbody with respect to the bogie when the train negotiates a curve. Pneumatic systems are used because of their compliance, necessary to ensure dynamic isolation between carbody and bogie, but have the drawbacks of large dimensions and slow response, often accompanied by a few damped oscillations. An innovative solution was developed using hydraulic actuators with an adaptive control law providing the actuators with artificial compliance, hence making them suitable for this application. A carbody centering system is thus obtained presenting fast response, small volume and the necessary compliance. The optimal control law for this system was defined, the system dynamic characteristics were analyzed and a technological demonstrator was built to assess the system merits. The paper presents the theoretical grounds for the system control, its implementation and performance, and the most significant test results obtained with the technological demonstrator.

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