Analysis on Curve Negotiation Ability of the Rail Vehicle Based on SIMPACK

2013 ◽  
Vol 721 ◽  
pp. 551-555 ◽  
Author(s):  
Li Hua Wang ◽  
An Ning Huang ◽  
Guang Wei Liu
Keyword(s):  
Dynamic Performance ◽  
Lateral Force ◽  
Lateral Stability ◽  
Rail Vehicle ◽  
Body Dynamics ◽  
Curve Track ◽  
The Stability ◽  
Multi Body ◽  
Body Dynamic ◽  
Curve Negotiation

The curve negotiation ability and lateral stability are the important and contradictory indicators when evaluating the dynamic performance of the rail vehicle. And in order to study the stability of the rail vehicle, its curve negotiation ability will be studied firstly. In this paper, the whole multi-body dynamic model of the rail vehicle was proposed based on the theory of multi-body dynamics in the software of Simpack. And the lateral force, derailment and overturning coefficient of the rail vehicle when it passed through a specific curve track with specific speed. Then the curve negotiation ability of the rail vehicle was estimated accurately.

Research on Running Stability of the Rail Vehicle Based on SIMPACK

2013 ◽  
Vol 328 ◽  
pp. 589-593
Author(s):  
Li Hua Wang ◽  
An Ning Huang ◽  
Guang Wei Liu
Keyword(s):  
Dynamic Model ◽  
Optimization Design ◽  
Dynamic Performance ◽  
Running Speed ◽  
Design And Optimization ◽  
Rail Vehicle ◽  
Body Dynamics ◽  
Multi Body ◽  
Body Dynamic ◽  
Track Irregularities

There are higher requirements on running stability of the rail vehicle with the incensement of the running speed. The running stability is one of the important indicators of evaluating the dynamic performance of the rail vehicle. In this paper, the whole multi-body dynamic model of the rail vehicle was proposed based on the theory of multi-body dynamics in the software of Simpack. And the lateral and vertical vibrate accelerations of the rail vehicle were simulated when it was inspired by the track irregularities. Then the running stabilities of the rail vehicle were estimated accurately. This will propose basis on the improving design and optimization design of the whole rail vehicle.

Analysis on Critical Speeds of the Rail Vehicle Based on SIMPACK

2013 ◽  
Vol 694-697 ◽  
pp. 69-72
Author(s):  
Li Hua Wang ◽  
An Ning Huang ◽  
Guang Wei Liu
Keyword(s):  
Dynamic Model ◽  
Dynamic Performance ◽  
Critical Speeds ◽  
Rail Vehicle ◽  
Body Dynamics ◽  
Linear And Nonlinear ◽  
Multi Body ◽  
Body Dynamic

Critical speeds are the important indicators when evaluating the dynamic performance of the rail vehicle. In this paper, the whole multi-body dynamic model of the rail vehicle was proposed based on the theory of multi-body dynamics in the software of Simpack. And the linear and nonlinear critical speeds of the whole rail vehicle inspirited by the track spectrum were simulated. This will provide a basis for analyzing on the whole rail vehicle.

Dynamic Performance of High-Speed Electric Multiple Unit within Multi-Body System Simulation

2019 ◽  
Vol 12 (4) ◽  
pp. 339-349
Author(s):  
Junguo Wang ◽  
Daoping Gong ◽  
Rui Sun ◽  
Yongxiang Zhao
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Dynamic Performance ◽  
Body System ◽  
High Speed Railway ◽  
Evaluation Indexes ◽  
Actual Operation ◽  
Multiple Unit ◽  
The Stability ◽  
Multi Body

Background: With the rapid development of the high-speed railway, the dynamic performance such as running stability and safety of the high-speed train is increasingly important. This paper focuses on the dynamic performance of high-speed Electric Multiple Unit (EMU), especially the dynamic characteristics of the bogie frame and car body. Various patents have been discussed in this article. Objective: To develop the Multi-Body System (MBS) model of EMU, verify whether the dynamic performance meets the actual operation requirements, and provide some useful information for dynamics and structural design of the proposed EMU. Methods: According to the technical characteristics of a typical EMU, a MBS model is established via SIMPACK, and the measured data of China high-speed railway is taken as the excitation of track random irregularity. To test the dynamic performance of the EMU, including the stability and safety, some evaluation indexes such as wheel-axle lateral forces, wheel-axle lateral vertical forces, derailment coefficients and wheel unloading rates are also calculated and analyzed in detail. Results: The MBS model of EMU has better dynamic performance especially curving performance, and some evaluation indexes of the stability and safety have also reached China’s high-speed railway standards. Conclusion: The effectiveness of the proposed MBS model is verified, and the dynamic performance of the MBS model can meet the design requirements of high-speed EMU.

scholarly journals Research on Coupled Dynamic Model of Tracked Vehicles and Its Solving Method

2015 ◽  
Vol 2015 ◽  
pp. 1-10
Author(s):  
Yuliang Li ◽  
Chong Tang
Keyword(s):  
Dynamic Performance ◽  
Tractive Force ◽  
Actual Structure ◽  
Discrete Method ◽  
Tracked Vehicles ◽  
Coupled Equations ◽  
Calculation Results ◽  
Dynamic Software ◽  
Multi Body ◽  
Body Dynamic

In order to conveniently analyze the dynamic performance of tracked vehicles, mathematic models are established based on the actual structure of vehicles and terrain mechanics when they are moving on the soft random terrain. A discrete method is adopted to solve the coupled equations to calculate the acceleration of the vehicle’s mass center and tractive force of driving sprocket. Computation results output by the model presented in this paper are compared with results given by the model, which has the same parameters, built in the multi-body dynamic software. It shows that the steady state calculation results are basically consistent, while the model presented in this paper is more convenient to be used in the optimization of structure parameters of tracked vehicles.

Kinematic Formulation of Mooring Platform During Collisions Based on Multi-Body Dynamic Theory

2018 ◽  
Author(s):  
Qiuwan Duan ◽  
Yang Yang
Keyword(s):  
Finite Element Method ◽  
Impact Force ◽  
Dynamic Theory ◽  
Kinematics Analysis ◽  
Body Dynamics ◽  
Load Analysis ◽  
Multi Body ◽  
The Impact ◽  
Analytical Expressions ◽  
Body Dynamic

When a platform is operating in a mooring, various vessels that frequently pass by result in severe accidental collisions of the platform. Thus, the kinematic response of the mooring platform should be investigated. A new analytical method, including a load analysis and kinematics analysis, is proposed in this paper. In the load analysis, the impact force is calculated using finite element method (FEM). In the kinematic analysis, closed-form analytical expressions based on multi-body dynamics are derived with the impact force as an input. Furthermore, the expressions are improved considering the fluid effect. A series of collision cases are implemented to validate the proposed method by FEM. The kinematic results solved by the proposed method agree well with FEM, which illustrates that the method is feasible and accurate. However, the proposed method taking around 30s, which is much shorter than 7200s by FEM, is proved to be more efficient.

A Comparison of the Stability and Curving Performance of Radial and Conventional Rail Vehicle Trucks

1981 ◽  
Vol 103 (3) ◽  
pp. 191-200 ◽  
Author(s):  
D. Horak ◽  
C. E. Bell ◽  
J. K. Hedrick
Keyword(s):  
Shear Stiffness ◽  
Bending Stiffness ◽  
Lateral Stability ◽  
High Shear ◽  
Wear Properties ◽  
Rail Vehicle ◽  
Curving Performance ◽  
Conventional Rail ◽  
The Stability ◽  
Total Shear

This paper compares the lateral stability and steady-state curving performance of radial and conventional rail vehicle trucks. The radial truck has two unique features, it allows direct elastic coupling between the wheelsets and it allows greater total truck shear stiffness for a given bending stiffness. It is shown that the first property allows the radial truck to achieve up to a 40 percent higher critical speed than the conventional truck for equivalent truck total shear and bending stiffness since the direct coupling between the wheelsets allows decoupling of the truck mass from the hunting wheelset masses. The second feature, i.e., greater shear stiffness capability, allows the radial truck to have improved wear properties during the negotiation of tight curves. It is shown that the high shear stiffness property combined with a low bending stiffness reduces the lateral flange force and wheelset angle of attack during flange contact. It is concluded that for routes where the majority of curves are less than 4 deg (greater than 400 m radius) the truck optimized for off-flange performance should have intermediate values of shear stiffness, bending stiffness, and conicity. On the other hand, for routes where the majority of curves are greater than 4 deg, the truck optimized for on-flange performance should have a high shear stiffness and low values of bending stiffness and conicity.

Lateral Stability of Freight Cars With Axles Having Different Wheel Profiles and Asymmetric Loading

1979 ◽  
Vol 101 (1) ◽  
pp. 1-16 ◽  
Author(s):  
J. M. Tuten ◽  
E. H. Law ◽  
N. K. Cooperrider
Keyword(s):  
Dynamic Response ◽  
Strong Influence ◽  
Lateral Stability ◽  
Loading Conditions ◽  
Stability Behavior ◽  
Rail Freight ◽  
Rail Vehicle ◽  
Asymmetric Loading ◽  
Left And Right ◽  
The Stability

The majority of studies of rail vehicle lateral dynamic response have utilized models wherein it is assumed that the loading and geometry of the vehicles are symmetrical left and right and fore and aft. It has been observed that with use North American rail freight vehicles develop transverse wheel profiles that may be different for wheels on a given axle and that may also differ from axle to axle on a given vehicle. As the transverse wheel profiles exert a strong influence on lateral dynamic response by affecting the effective conicity and gravitational stiffness of the wheelset, models capable of having different wheel profiles on the same axle as well as on different axles were developed to investigate the stability behavior. Additionally, these models were formulated so that the effects on stability of asymmetric fore and aft loading conditions, as manifested through gravitational stiffness effects and creep coefficients, could be examined. Results of studies using these models are presented that display characteristics markedly different from those of completely symmetric models. A particularly interesting result is that, in most cases, the lateral stability of vehicles with different wheel profiles on the various axles is strongly sensitive to the direction of motion with results for each direction of motion which may differ radically from symmetric cases.

Safety Assessment of Heave Compensator Using Multi-Body Dynamics

2015 ◽  
Vol 764-765 ◽  
pp. 364-368
Author(s):  
Sung Gu Hwang ◽  
Gwi Nam Kim ◽  
Yong Gil Jung ◽  
Sun Chul Huh
Keyword(s):  
Safety Assessment ◽  
Compensation System ◽  
Suspension System ◽  
Drilling Operation ◽  
Car Suspension ◽  
Body Dynamics ◽  
Stress And Deformation ◽  
The Stability ◽  
Heave Motion ◽  
Multi Body

Heave Compensation system minimizes vessel heave motion during drilling operation of drillship. Heave compensator plays a role as damping form heave motion of drillship such as principle spring of car suspension system. The load transfers on the parts of heave compensator. Stress and deformation of all parts is evaluated to diagnose the stability of the compensator. This study makes a decision on the safety of structure by ANSYS 12.0v workbench.

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.

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