Lateral Stability Behavior of Railway Freight Car System With Elasto-Damper Coupled Wheelset: Part 1—Wheelset Model

1987 ◽  
Vol 109 (4) ◽  
pp. 493-499 ◽  
Author(s):  
A. K. W. Ahmed ◽  
S. Sankar
Keyword(s):  
Lateral Stability ◽  
Conventional System ◽  
Stability Behavior ◽  
Rail Vehicle ◽  
Railway Freight ◽  
Linearized Stability ◽  
Freight Car ◽  
The Stability ◽  
The Mathematical Model ◽  
Railway Freight Car

A general model of single rail vehicle wheelset with elasto-damper coupling between the wheels, has been developed as a first step in developing a railway freight truck model with elasto-damper coupled wheelset (EDCW). By choosing different coupler parameters, various stiffness-damper combinations, as well as rigid axle (conventional wheelset) could be simulated. The mathematical model of EDCW has been validated by comparing the model under limiting cases with those of published results for conventional system. In this paper, the results of linearized stability analysis of EDCW model on tangent track are presented and discussed. The investigation showed that wheelset coupler parameters have significant influence on the stability behavior of the wheelset, and there is an optimal coupler parameter which can improve the wheelset critical speed over the conventional system.

Lateral Stability Behavior of Railway Freight Car System With Elasto-Damper Coupled Wheelset: Part 2—Truck Model

1987 ◽  
Vol 109 (4) ◽  
pp. 500-507 ◽  
Author(s):  
A. K. W. Ahmed ◽  
S. Sankar
Keyword(s):  
Critical Speed ◽  
Lateral Stability ◽  
Stability Behavior ◽  
Railway Freight ◽  
Linearized Stability ◽  
Freight Car ◽  
Lateral Mode ◽  
Lateral Modes ◽  
The Stability ◽  
Railway Freight Car

To investigate the effect of elasto-damper coupled wheelset (EDCW), on the lateral stability behavior of freight cars, a railway freight truck model with two EDCW and pseudo-car body has been developed. The results of linearized stability analysis showed, that for small values of wheelset coupler stiffness, damping has significant influence on the stability behavior of wheelset relative spin as well as wheelset and truck lateral modes. The results further showed that, by utilizing an optimal EDCW coupler parameter, the critical speeds corresponding to truck hunting and wheelset lateral mode can be made equal. In doing so, the truck hunting critical speed on tangent track can be improved by over 100 percent in comparison to truck model with conventional rigid axle wheelsets.

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.

scholarly journals NECESSITY TO IMPROVE THE MATHEMATICAL MODEL OF FREIGHT CARS TO STUDY CASES OF ITS DERAILMENTS

2020 ◽  
pp. 442-451
Author(s):  
А.V. Batig ◽  
A. Ya. Kuzyshyn
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Computer Experiment ◽  
Rolling Stock ◽  
Software Systems ◽  
Freight Car ◽  
The Stability ◽  
The Many ◽  
The Impact ◽  
The Mathematical Model

One of the most important problems that pose a serious threat to the functioning of railways is the problem of freight cars derailment. However, according to statistics, the number of cases of the derailments of freight cars in trains annually grows. Тo prevent such cases, the necessary preventive measures are developed, and to study the causes of their occurrence, a significant number of mathematical models, programs and software systems created by leading domestic and foreign scientists. Studies of such mathematical models by the authors of this work have led to the conclusion that they are not sufficiently detailed to the extent that it is necessary for analyze the reasons of its derailment. At the same time, an analysis of the causes of the rolling stock derailments on the railways of Ukraine over the past five years showed that in about 20 % of cases they are obvious, and in 7 % of cases they are not obvious and implicitly expressed. The study of such cases of rolling stock derailment during an official investigation by the railway and during forensic railway transport expertises requires the use of an improved mathematical model of a freight car, which would allow a quantitative assessment of the impact of its parameters and rail track on the conditions of railway accidents. Therefore, taking into account the main reasons that caused the occurrence of such railroad accidents over the last five years on the railways of Ukraine, the article selected the main directions for improving the mathematical model of a freight car, allowing to cover all the many factors (explicit and hidden) and identify the most significant ones regarding the circumstances of the derailment rolling stock off the track, established on the basis of a computer experiment. It is proposed in the mathematical model of a freight car to take into account the guiding force, the value of which is one of the main indicators of the stability of the rolling stock. The authors of the article noted that not taking into account the influence of the guiding forces on the dynamics of the freight car can lead to an erroneous determination of the reasons for the rolling stock derailment or even to the impossibility of establishing them.

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.

CALCULATED SIMULATION OF THE DYNAMICS OF A RAILWAY WHEEL WHEN ROLLING THROUGH A BUTT CLEARANCE

2020 ◽  
Author(s):  
Galina Neklyudova ◽  
Elena Evtuh
Keyword(s):  
Computer Simulation ◽  
Contact Problem ◽  
Computer Model ◽  
Joint Zone ◽  
Railway Freight ◽  
Dynamic Forces ◽  
Freight Car ◽  
Railway Freight Car ◽  
Range Of Values ◽  
Elastic Characteristics

The article is devoted to the description of the creation of a computer model of the movement of a railway freight car along the section of the track adjacent to the rail joint. The model takes into account the elastic characteristics and ballast subsidence in the joint zone. The results of computer simulation are further used to solve the contact problem in the wheel-rail system. The study varied a number of parameters affecting this process of wheel movement. For the operating speeds of the freight car, the range of values ​​of the dynamic forces arising between the wheel and the rail during the passage of the joint is determined.

scholarly journals The Efficiency Index Analysis of Railway Freight Car

2012 ◽  
Vol 15 (3) ◽  
pp. 272-277 ◽  
Author(s):  
Kyoung-Tae Kim ◽  
Suk Lee ◽  
Yong-Jang Kwon ◽  
Young-Joo Kim
Keyword(s):  
Efficiency Index ◽  
Railway Freight ◽  
Index Analysis ◽  
Freight Car ◽  
Railway Freight Car

Construction of China Railway Freight Car Color Coating Genealogy

2012 ◽  
Vol 271-272 ◽  
pp. 811-817
Author(s):  
Pu Wang ◽  
Tao Huang
Keyword(s):  
Corporate Image ◽  
Material Technology ◽  
Existing Problems ◽  
Railway Freight ◽  
Freight Car ◽  
Coating Color ◽  
Color Coating ◽  
Coating Design ◽  
Railway Freight Car ◽  
Relevant Factors

The paper analyzes existing problems in China's freight car color coating, compares the gap between same products abroad, comprehensively analyzes relevant factors which affect freight car coating, uses system theory combined with specification of safe color, visual safety psychology and coating material technology and takes requirements such as type, structure, safety and corporate image into consideration to establish China's railway freight car color coating genealogy. It provides systematical advices for China's railway freight car color coating design and solves problems like single and disorder coating color, poor indicative of safety feature to improve the level of China's railway freight car coating design.

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