Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

Ashtiani, Iman Hazrati; Rakheja, Subhash; Ahmed, A. K. W.

doi:10.1177/0954409716647095

Cited by 14 publications

(7 citation statements)

References 37 publications

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“…In addition, the design of the side frame box opening and the axle box presupposes the presence of longitudinal and transverse gaps between the box housing lug and the box opening guides, through which the nature of their contact can also change. This phenomenon negatively affects the dynamics of the car and, as a result, leads to intensive wear of the wheel flanges [1,7,9,14,23].…”

Section: Resultsmentioning

confidence: 99%

Research of Wheel-Rail Wear Due to Non-Symmetrical Loading of a Flat Car

Shatunov

Швець

Кирильчук

2019

STP

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The paper is aimed at determining the influence of non-symmetrical loading of a flat car on the magnitude of the wear factor of a wheel-rail pair when changing the operation parameters that occur in operation. Methodology. The dynamic loading of the flat car, model 13-401 with typical three-piece bogies is studied using a model of spatial oscillations of a five-car coupling with the help of mathematical and computer simulation. Theoretical calculations are performed for the most dangerous sections of the railway track-small and medium radius curves in the range of permissible speeds. Findings. The indicators of wear of the rolling stock wheels and the rails are analysed on the example of flat cars in the presence of a longitudinal and transverse displacement of the load mass centre relative to the car symmetry centre. To obtain information on the effect of permissible deviations of the arrangement of cargo in the car on the magnitude of the dynamic loading of the wheel-rail contact, the authors performed theoretical studies of the spatial variations of the rail carriage and its interaction with the track. Originality. To determine the wear of the wheel-rail pair, the effect of displacement in two directions from the central axis of symmetry of the load gravity centre was studied, taking into account the value of the travel speed along the curved sections of the small and medium radius using a mathematical model of coupling of five freight cars. Practical value. As a result of the theoretical studies carried out, the authors assessed such factors as wear factor, directional force, and hunting of the wheel set of freight rolling stock in the event of load gravity centre displacement when moving along curved sections of the railway track. To establish the possible cause of intensive wear of the wheels and rails, the following parameters were analysed: lozenging of front bogie side frames; hunting of the left side frame of the front bogie; mutual longitudinal movement of the side frame and axle box of the front wheel set; mutual hunting of the left side frame of the bogie relative to the front wheel set.

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Section: Resultsmentioning

confidence: 99%

Research of Wheel-Rail Wear Due to Non-Symmetrical Loading of a Flat Car

Shatunov

Швець

Кирильчук

2019

STP

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“…The model incorporates friction forces in different suspension components of the bogie and the interface between bogie and the car body, which resulted in a relatively complex MBD model of the car with 114 degrees of freedom. The model has been described in detail in Hazrati Ashtiani et al 27 Briefly, the vehicle model employs comprehensive representations of the friction forces due to suspension wedges and interactions of the car body with the center plate and side bearings.…”

Section: Model Formulations Mbd Model Of the Tank Carmentioning

confidence: 99%

“…For this purpose, an array of point-plane contact elements was formulated to derive frictional forces due to relative motions of the wedges with respect to the side frame and the bolster. A methodology for identifying the model parameters has been described in Hazrati Ashtiani et al 27 and Hazrati Ashtiani. 28 The pointplane contact approach could efficiently estimate the resultant friction moments developed at the center plates and side bearings under relative rotations of the contacting bodies encountered during curving or switch-passing maneuvers.…”

Section: Model Formulations Mbd Model Of the Tank Carmentioning

confidence: 99%

“…This is likely caused by frictional forces in the wedges and the center plates of the bogies, which have also been observed in reported studies. 27,31 The residual roll response in case of liquid cargo, however, is considerably smaller due to presence of the slosh force and moment. The higher peak roll angle response of the liquid cargo car is attributable to contributions of the liquid cargo slosh, particularly the lateral slosh force and roll moment.…”

Section: Effects Of Liquid Cargo Slosh During a Switch-passing Maneuvermentioning

confidence: 99%

“…The frequency of oscillations is about 1.34 Hz, which corresponds to primary hunting frequency of the wheelsets. 27 The magnitude of the oscillatory wheelset lateral force diminishes after a number of oscillations since the forward speed is below the critical hunting speed.…”

Section: Effects Of Liquid Cargo Slosh During a Switch-passing Maneuvermentioning

confidence: 99%

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Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Ashtiani

Rakheja

Ahmed

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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The movement of the liquid cargo within a partly filled tank car is known to impose additional slosh forces and moments that may adversely affect the dynamic responses of the vehicle. This study is aimed at analyzing the liquid cargo slosh in a partly filled tank car and its effects on vehicle responses during a switch-passing maneuver. A two-dimensional analytical liquid slosh model is formulated for the analyses of the liquid load shift in the roll plane, lateral slosh force, and roll moment through summation of first four antisymmetric modes of the liquid. The analytical slosh model is integrated to a 114 degrees-of-freedom multibody dynamic model of the railway tank car comprising nonlinear wheel–rail contact and contact pairs of the suspension system. The validity of the slosh model is illustrated by comparing the responses with those reported in other studies and those obtained from a nonlinear computational fluid dynamic model. The coupled fluid–vehicle model is subsequently used to study the effects of fluid slosh during switch-passing maneuvers on different response measures, namely roll motion of the tank car, lateral and vertical wheel–rail contact forces, and derailment ratio. The significance of the liquid cargo slosh in the partially filled state is demonstrated by comparing the responses with those of the car with equivalent rigid cargo. The results show that liquid sloshing within the partly filled car can lead to higher magnitudes of car body roll angle and thereby the unloading ratio compared to the conventional rigid cargo car. Switch-passing critical speeds are further identified for different fill ratios and switch geometries. For fill ratios below 80%, the switch-passing critical speeds of the partly filled car are substantially lower compared to those of the equivalent rigid cargo car. Neglecting the contributions due to dynamic slosh force and roll moment arising from a partially filled railway tank car may thus lead to underestimation of the critical speed in switch-passing maneuvers.

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Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Sun

Dongfang

et al. 2020

Multibody Syst Dyn

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The selection of a wheel profile is a topic of great interest as it can affect running performances and wheel wear, which needs to be determined based on the actual operational line. Most existing studies, however, aim to improve running performances or reduce contact forces/wear/rolling contact fatigue (RCF) on curves with ideal radii, with little attention to the track layout parameters, including curves, superelevation, gauge, and cant, etc. In contrast, with the expansion of urbanization, as well as some unique geographic or economic reasons, more and more railway vehicles shuttle on fixed lines. For these vehicles, the traditional wheel profile designing method may not be the optimal choice. In this sense, this paper presents a novel wheel profile designing method, which combines FaSrtip, wheel material loss function developed by University of Sheffield (USFD function), and Kriging surrogate model (KSM), to reduce wheel wear for these vehicles that primarily operate on fixed lines, for which an Sgnss wagon running on the German Blankenburg–Rübeland railway line is introduced as a case. Besides, regarding the influence of vehicle suspension characteristics on wheel wear, most of the studies have studied the lateral stiffness, longitudinal stiffness, and yaw damper characteristics of suspension systems, since these parameters have an obvious influence on wheel wear. However, there is currently little research on the relationship between the vertical suspension characteristics and wheel wear. Therefore, it is also investigated in this paper, and a suggestion for the arrangement of the vertical primary spring stiffness of the Y25 bogie is given.

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Influence of friction wedge characteristics on lateral response and hunting of freight wagons with three-piece bogies

Cited by 14 publications

References 37 publications

Research of Wheel-Rail Wear Due to Non-Symmetrical Loading of a Flat Car

Research of Wheel-Rail Wear Due to Non-Symmetrical Loading of a Flat Car

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

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