scholarly journals Effect of Variable Wheelset Steering Stiffness and Yaw Damper Damping on Hunting Stability

2020 ◽  
Vol 1676 ◽  
pp. 012029
Author(s):  
Lixin Zhang ◽  
Qi Wang ◽  
Yunhai Yu
Keyword(s):  
Hunting Stability

Hunting Stability Analysis of a New High-Speed Railway Vehicle Model Moving on Curved Tracks

2007 ◽  
Author(s):  
Yung-Chang Cheng ◽  
Sen-Yung Lee
Keyword(s):  
High Speed ◽  
Degrees Of Freedom ◽  
Lateral Displacement ◽  
Creep Model ◽  
Railway Vehicle ◽  
Nonlinear Creep ◽  
Car Body ◽  
Suspension Parameters ◽  
Virtual Boundary ◽  
Hunting Stability

A new dynamic model of railway vehicle moving on curved tracks is proposed. In this new model, the motion of the car body is considered and the motion of the tuck frame is not restricted by a virtual boundary. Based on the heuristic nonlinear creep model, the nonlinear coupled differential equations of the motion of a fourteen degrees of freedom car system, considering the lateral displacement and the yaw angle of the each wheelset, the truck frame and the car body, moving on curved tracks are derived in completeness. To illustrate the accuracy of the analysis, the limiting cases are examined. In addition, the influences of the suspension parameters on the critical hunting speeds evaluated via the linear and the nonlinear creep models respectively are studied. Furthermore, the influences of the suspension parameters on the critical hunting speeds evaluated via the fourteen degrees of freedom car system and the six degrees of freedom truck system, which the motion of the tuck frame is restricted by a virtual boundary, are compared.

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.

Effect of System Nonlinearities on Locomotive Bogie Hunting Stability

1998 ◽  
Vol 29 (6) ◽  
pp. 365-384 ◽  
Author(s):  
MEHDI AHMADIAN ◽  
SHAOPU YANG
Keyword(s):  
Hunting Stability

Hunting stability analysis of partially filled tank wagon on curved track using coupled CFD-MBD method

2019 ◽  
Vol 50 (1) ◽  
pp. 45-69 ◽  
Author(s):  
Ahmad Rahmati-Alaei ◽  
Majid Sharavi ◽  
Masoud Samadian Zakaria
Keyword(s):  
Stability Analysis ◽  
Curved Track ◽  
Hunting Stability

Object-Oriented Modeling and Simulation of Railway Vehicle Systems

2010 ◽  
Vol 26-28 ◽  
pp. 900-904 ◽  
Author(s):  
Yong He ◽  
Guo Fu Ding ◽  
Yi Sheng Zou ◽  
Mei Wei Jia ◽  
Ming Heng Xu
Keyword(s):  
Software Package ◽  
Ride Comfort ◽  
Object Oriented ◽  
Simulation Software ◽  
Contact Forces ◽  
Railway Vehicle ◽  
Vehicle Systems ◽  
Hunting Stability ◽  
Multi Body ◽  
And Behavior

An object-oriented modeling method was proposed to develop a simulation software package named GVDS which could be used to predict some aspects of dynamic behavior of railway vehicle. The package based on multi-body dynamics mainly consists of three parts, an interactive pre-processor, the solver and an interactive post-processor. With UML, demands and structure of the software package are represented. By modeling of the geometry and behavior of each object, virtual prototype of railway vehicle is formed and by the simulation, the critical speed of hunting stability, wheel-rail contact forces and so on can be determined and the hunting stability, curving behavior and ride comfort can be analyzed and evaluated. Finally, some cases are simulated. The simulation results show the effectiveness of the proposed method.

scholarly journals 128 Hunting Stability and Primary Suspension Design of New-Type Independently Rotating Truck

2011 ◽  
Vol 2011 (0) ◽  
pp. _128-1_-_128-10_
Author(s):  
Yuta KOMATSU ◽  
Yusuke MATSUTANI ◽  
Hiroyuki SUGIYAMA ◽  
Yohei MICHITSUJI ◽  
Yoshihiro SUDA
Keyword(s):  
New Type ◽  
Hunting Stability

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

scholarly journals Hunting Stability of High-Speed Railway Vehicles Under Steady Aerodynamic Loads

2018 ◽  
Vol 18 (07) ◽  
pp. 1850093 ◽  
Author(s):  
Xiao-Hui Zeng ◽  
Jiang Lai ◽  
Han Wu
Keyword(s):  
Stability Analysis ◽  
High Speed ◽  
Critical Speed ◽  
Railway Vehicle ◽  
Aerodynamic Load ◽  
High Speed Railway ◽  
Aerodynamic Loads ◽  
Railway Vehicles ◽  
Pitch Moment ◽  
Hunting Stability

With the rising speed of high-speed trains, the aerodynamic loads become more significant and their influences on the hunting stability of railway vehicles deserve to be considered. Such an effect cannot be properly considered by the conventional model of hunting stability analysis. To this end, the linear hunting stability of high-speed railway vehicles running on tangent tracks is studied. A model considering the steady aerodynamic loads due to the joint action of the airflow facing the moving train and the crosswind, is proposed for the hunting stability analysis of a railway vehicle with 17 degrees of freedom (DOF). The key factors considered include: variations of the wheel–rail normal forces, creep coefficients, gravitational stiffness and angular stiffness due to the actions of the aerodynamic load, which affects the characteristics of hunting stability. Using the computer program developed, numerical calculations were carried out for studying the behavior of the linear hunting stability of vehicles under steady aerodynamic loads. The results show that the aerodynamic loads have an obvious effect on the linear critical speeds and instability modes. The linear critical speed decreases monotonously as the crosswind velocity increases, and the influences of pitch moment and lift force on the linear critical speed are larger than the other components of the aerodynamic loads.

Sign in / Sign up

Export Citation Format

Share Document