Critical speed enhancement of a Korean high-speed train through optimization with measured wheel profiles

2016 ◽  
Vol 232 (1) ◽  
pp. 171-181 ◽  
Author(s):  
Chang-Sung Jeon ◽  
Hong-Shik Cho ◽  
Choon-Soo Park ◽  
Seog-Won Kim ◽  
Tae-Won Park
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Initial Condition ◽  
High Speed Train ◽  
Wheel Wear ◽  
Suspension Parameters ◽  
The Relationship

This study describes the critical speed enhancement of the KTX-Sancheon, a Korean high-speed train, using measured wheel profiles. The wheel wear shape of the commercial high-speed train was measured according to mileage, and the relationship between conicity and mileage was investigated. The critical speed of the KTX-Sancheon power car was analyzed numerically with the measured wheel profiles. The suspension parameters were optimized to increase the critical speed of the KTX-Sancheon. As a result, the critical speed of the power car increased by 34.1% compared to its initial condition. The results are being used for a new design of the power bogie.

Aerodynamic Characteristics Analysis of High-Speed Train on Cutting under Crosswinds

2013 ◽  
Vol 300-301 ◽  
pp. 62-67
Author(s):  
Kun Ye ◽  
Ren Xian Li
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
High Speed Train ◽  
Aerodynamic Forces ◽  
Cutting Depth ◽  
Cutting Slope ◽  
Characteristics Analysis ◽  
Relationship Of ◽  
The Relationship

Cutting is an effective device to reduce crosswind loads acting on trains. The cutting depth, width and gradient of slope are important factors for design and construction of cutting. Based on numerical analysis methods of three-dimensional viscous incompressible aerodynamics equations, aerodynamic side forces and yawing moments acting on the high-speed train, with different depths and widths of cutting，are calculated and analyzed under crosswinds，meanwhile the relationship of the gradient of cutting slope and transverse aerodynamic forces acting on trains are also studied. Simulation results show that aerodynamic side forces and yawing moments acting on the train（the first, middle and rear train）decrease with the increase of cutting depth. The relationship between transverse forces (moments) coefficients acting on the three sections and the cutting depth basically is the three cubed relation. The bigger is cutting width，the worse is running stability of train. The relationship between yawing moments coefficients acting each body of the train and the cutting width approximately is the three cubed relation. The transverse Aerodynamic forces decreased gradually with the increase of the gradient of cutting slope, the relationship between yawing moments coefficients acting each body of the train and the gradient of cutting slope basically is the four cubed relation.

The Motor Active Flexible Suspension and Its Dynamic Effect on the High-Speed Train Bogie

2017 ◽  
Vol 140 (6) ◽  
Author(s):  
Yuan Yao ◽  
Yapeng Yan ◽  
Zhike Hu ◽  
Kang Chen
Keyword(s):  
Control System ◽  
Time Delay ◽  
High Speed ◽  
State Feedback ◽  
State Feedback Control ◽  
System Stability ◽  
High Speed Train ◽  
Suspension Parameters ◽  
Linear And Nonlinear ◽  
Hunting Stability

We put forward the motor active flexible suspension and investigate its dynamic effects on the high-speed train bogie. The linear and nonlinear hunting stability are analyzed using a simplified eight degrees-of-freedom bogie dynamics with partial state feedback control. The active control can improve the function of dynamic vibration absorber of the motor flexible suspension in a wide frequency range, thus increasing the hunting stability of the bogie at high speed. Three different feedback state configurations are compared and the corresponding optimal motor suspension parameters are analyzed with the multi-objective optimal method. In addition, the existence of the time delay in the control system and its impact on the bogie hunting stability are also investigated. The results show that the three control cases can effectively improve the system stability, and the optimal motor suspension parameters in different cases are different. The direct state feedback control can reduce corresponding feed state's vibration amplitude. Suppressing the frame's vibration can significantly improve the running stability of bogie. However, suppressing the motor's displacement and velocity feedback are equivalent to increasing the motor lateral natural vibration frequency and damping, separately. The time delay over 10 ms in control system reduces significantly the system stability. At last, the effect of preset value for getting control gains on the system linear and nonlinear critical speed is studied.

scholarly journals Analysis of the Critical Speed and Hunting Phenomenon of a High Speed Train

2014 ◽  
Vol 17 (5) ◽  
pp. 342-348
Author(s):  
Ki-Seok Song ◽  
Ja-Choon Koo ◽  
Yeon-Sun Choi
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
High Speed Train

Suspension parameters optimum of high-speed train bogie for hunting stability robustness

2019 ◽  
Vol 8 (3) ◽  
pp. 195-214
Author(s):  
Yuan Yao ◽  
Guang Li ◽  
Guosong Wu ◽  
Zhenxian Zhang ◽  
Jiayin Tang
Keyword(s):  
High Speed ◽  
High Speed Train ◽  
Suspension Parameters ◽  
Stability Robustness ◽  
Hunting Stability

Failure Effects of Anti-Hunting Damper on High-Speed Train

2013 ◽  
Vol 694-697 ◽  
pp. 90-94 ◽  
Author(s):  
Ji Min Zhang ◽  
Li Wen Man
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Critical Speed ◽  
Dynamic Performance ◽  
High Speed Train ◽  
Multi Body ◽  
Body Dynamic

The multi-body dynamic model of the high-speed train is established in order to study the failure effects of anti-hunting damper. Four kinds of failure case of the anti-hunting damper are compared, specifically including: one anti-hunting damper of the front bogie is broken; two anti-hunting dampers of the front bogie are broken; three anti-hunting dampers of the front bogie are broken; all four anti-hunting dampers of the front bogie are broken. The results have shown: when only one anti-hunting damper is broken, the influence to the dynamic performance of the high speed train is small, but once two anti-hunting dampers or more out of work, the critical speed of the vehicle decreases much more and the curve-passing performance also become worse.

Stability of Elasto-Damper–Coupled Wheelset for High-Speed Rail Vehicles

1996 ◽  
Vol 1531 (1) ◽  
pp. 20-26
Author(s):  
Junghsen Lieh ◽  
Jie Yin
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
Vehicle Stability ◽  
Optimal Parameters ◽  
High Speed Rail ◽  
Stability Boundaries ◽  
Vehicle Performance ◽  
Suspension Parameters ◽  
Rail Vehicles ◽  
Stiffness And Damping

A symmetric wheelset with an elasto-damper coupling between the wheels is used to investigate the effect of coupling and primary stiffness and damping on the vehicle critical speed. Different suspension parameters are considered. Stability boundaries for various conditions are presented. The dynamic model of the elasto-damper–coupled wheelset is validated using published results. Both coupler and primary suspensions can dramatically affect the vehicle stability, and optimal parameters can be used to improve the vehicle performance over that of the conventional system.

Tests Undertaken with Turbine Train TGV 001

1977 ◽  
Vol 191 (1) ◽  
pp. 45-57 ◽  
Author(s):  
J. Bouley
Keyword(s):  
High Speed ◽  
Critical Speed ◽  
High Speed Train ◽  
General Application ◽  
Factors Affecting ◽  
Fundamental Knowledge

The tests undertaken with train TGV 001 formed an essential part of the total SNCF high speed train research and yielded valuable information concerning bogie critical speed, factors affecting comfort, braking systems and train resistance. This information was valuable for the design of the high speed train sets for the new Paris — Lyons line but represents new fundamental knowledge of more general application.

scholarly journals Analysis of wheel wear characteristics of high-speed train based on field data

2019 ◽  
Vol 85 (878) ◽  
pp. 19-00091-19-00091
Author(s):  
Satoshi HARA ◽  
Yoshiaki TERUMICHI ◽  
Katsuya TANIFUJI
Keyword(s):  
High Speed ◽  
Field Data ◽  
High Speed Train ◽  
Wheel Wear ◽  
Wear Characteristics

Aerodynamic Effects of Unvented Hoods on the Initial Compression Wave Generated by a High-Speed Train Entering a Tunnel

2015 ◽  
Vol 138 (3) ◽  
Author(s):  
Xintao Xiang ◽  
Leiping Xue ◽  
Benlong Wang
Keyword(s):  
Pressure Gradient ◽  
Compression Wave ◽  
High Speed ◽  
Maximum Pressure ◽  
High Speed Train ◽  
Main Aspect ◽  
Section Area ◽  
Tunnel Section ◽  
Train Speed ◽  
The Relationship

The influence of unvented hood on the initial compression wave generated by a high-speed train entering a tunnel is investigated using computational fluid dynamics. Comparisons with experimental data are first carried out to verify the numerical model. The relationship between the pressure gradient peaks and main aspect factors is studied by parametric analysis. Influences of train speed, blockage ratio of train to tunnel, section area ratio of hood to tunnel, and hood length are investigated. Based on the numerical results, two empirical formulations are proposed to predict the influence of hood and tunnel geometries on the maximum pressure gradient during the CRH3 entering a tunnel with unvented hood.

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