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 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 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.

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.

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.

The Acoustic Emission Diagnose and Analysis of Journal Bearing‘s Inner Ring Looseness Fault by Truck Wheel

2011 ◽  
Vol 130-134 ◽  
pp. 54-57
Author(s):  
Hai Chao Cai ◽  
Dong Feng Wang ◽  
Qiao Yu Xu ◽  
Zhen Dong Shang
Keyword(s):  
Acoustic Emission ◽  
Wavelet Packet ◽  
Characteristic Parameter ◽  
Present Condition ◽  
Acoustic Emission Technique ◽  
Railway Freight ◽  
Freight Car ◽  
Dynamic Loading Conditions ◽  
Emission Detection ◽  
Railway Freight Car

In this paper, we combine the characteristics of acoustic emission detection with the present condition of truck rolling bearing’s fault detection ,adopting the acoustic emission technique to examine railway freight car ’s journal bearing inner ring looseness .We put forward the method which wavelet packet analyze and withdraw bearing acoustic emission signal’s feature vector. Through the energy distribution comparison of inner ring’s non-looseness and looseness, we extract the ratio between high frequency’s internal energy and total energy as the characteristic parameter , which can recognize the inner ring’s loose fault effectively. Acoustic emission technique is a dynamic detection method, which can get materials’ important information,fatigue crack propagation,under the dynamic loading conditions. In comparison with the traditional vibration detection, it has the characteristics of the early prediction of bearing fault.

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