Lateral Stability and Steady State Curving Performance of Unconventional Rail Trucks.

Dukkipati, Rao V.; Narayanaswamy, Srinivasan

doi:10.1299/jsmec.45.176

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…The railway carriage running on tangent tracks is modelled by second-order differential equations of motion (1) to (14). A simple and important technique is used to transform the governing equations of motion into first-order differential equations in a suitable form known as state-space equations.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The effects of railway track imperfections on track dynamic behaviour, and the effect of unsupported sleepers on the normal load of wheelrail were investigated by Zhang et al [12], in which the system is modelled by 35 degrees of freedom considering the lateral and vertical displacements, roll, pitch, and yaw angles for the carbody, front, and rear bogie frames and the four wheelsets. An ideal truck model with full-frame decoupling was represented by Dukkipati and Narayana Swamy [13,14] which is modelled by eight degrees of freedom. An investigation of dynamic interaction of long suspension bridges with running trains is presented by Xia et al [15] in which a 27-degrees-of-freedom model is used.…”

Section: Introductionmentioning

confidence: 99%

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Railway carriage simulation model to study the influence of vertical secondary suspension stiffness on ride comfort of railway carbody

Abood

Khan

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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A mathematical model of a railway carriage moving on tangent tracks is constructed by deriving the equations of motion concern the model in which single-point and two-point wheel-rail contacts are considered. The presented railway carriage model comprises front and rear simple conventional bogies with two leading and trailing wheelsets attached to each bogie. The railway carriage is modeled using 31 degrees of freedom which govern vertical displacement, lateral displacement, roll angle, and yaw angle dynamic response of wheelset, whereas vertical displacement, lateral displacement, roll angle, pitch angle, and yaw angle dynamic response carbody and each of the two bogies were also studied. Linear stiffness and damping parameters of longitudinal, lateral, and vertical primary and secondary suspensions are provided to the railway carriage model. Combination of linear Kalker's theory and non-linear Heuristic model is adopted to calculate the creep forces introduced at wheel and rail contact patch area. Computeraided simulation is constructed to solve the governing differential equations of the mathematical model using Runge-Kutta fourth-order method. Principle of limit cycle and phase plane approach is applied to realize the stability and evaluate the concerning critical hunting velocity at which the railway carriage starts to hunt. The numerical simulation model is used to study the influence of vertical secondary suspension spring stiffness on the ride passenger comfort of railway carbody at speeds below and at critical hunting velocity. High magnitudes of vertical secondary spring stiffness suspension introduce undesirable roll and yaw dynamic responses in which affect ride passenger comfort at critical hunting velocity.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Railway carriage simulation model to study the influence of vertical secondary suspension stiffness on ride comfort of railway carbody

Abood

Khan

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The main assumption is the decoupling of lateral and vertical motions. [11][12][13][14][15][16] The lateral dynamics of the RV system is mainly included in curved tracks. Based on the RV structural symmetry, Nejlaoui et al 11 have developed a quarter RV model, which has 8 DOF.…”

Section: Introductionmentioning

confidence: 99%

“…The developed model was used to evaluate the comfort and the safety of the RV system. Dukkipati and Narayana Swamy 12 developed a 6 DOF RV system, composed of one bogie and two wheel-sets, in order to study the effect of the wheel conicity and the suspension parameters on the performance and stability of RV system in curved track. The DOF is the lateral and yaw motions of each component of the RV system.…”

Section: Introductionmentioning

confidence: 99%

Development of a reduced dynamic model for comfort evaluation of rail vehicle systems

Graa

Nejlaoui

Houidi

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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In this paper, an analytical reduced dynamic model of a rail vehicle system is developed. This model considers only 38 degrees of freedom of the rail vehicle system. This reduced model can predict the dynamic behaviour of the rail vehicle while being simpler than existing dynamic models. The developed model is validated using experimental results found in the bibliography and its results are compared with existing more complex models from the literature. The developed model is used for the passenger comfort evaluation, which is based on the value of the weighted root mean square acceleration according to the ISO 2631 standard. Several parameters of the system, i.e., passenger position, loading of the railway vehicle and its speed, and their effect on the passenger comfort are investigated. It was shown that the level of comfort is mostly affected by the speed of the railway vehicle and the position of the seat. The load, however, did not have a significant effect on the level of comfort of the passenger.

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“…Dukkipati et al 8 and Narayana et al 9 applied heuristic nonlinear creep theory in analyses of the lateral stability and steady-state curving performance of bogie systems. Bell et al 10 investigated the stability and curving mechanics of a forced steering bogie system without considering spin creepage.…”

Section: Introductionmentioning

confidence: 99%

A parametric dynamic study on hunting stability of full dual-bogie railway vehicle

Kim

Jung

Seok

2011

Int. J. Precis. Eng. Manuf.

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Analysis is performed on the hunting stability of a full railway vehicle system composed of a vehicle body, two bogie frames, and two wheelsets for each bogie frame. Incorporated into this analysis are the nonlinear heuristic creep and flange-rail contact models. The results show that the hunting speed is most sensitive to the primary longitudinal and lateral stiffnesses, and the nonlinear heuristic creep model plays a key role in confining the hunting speed within a physically reasonable range. Eigenanalysis is performed to investigate the dynamic behavior of the vehicle in the vicinity of the hunting speed. The results reveal that there exists not only the most dominant pair of complex conjugate roots, but also its shadowed roots. The roles of these two principal pairs of eigensolutions in the hunting motion are thoroughly explored via numerical studies using bifurcation analysis and an orbital representation. It is shown that the nonlinear hunting motions before the modal transition speed mainly refer to the principal mode, and those after the critical speed refer not only to the principal mode, but also to its shadowed mode, which supports the necessity of the dual-bogie railway vehicle model in the hunting analysis. Parameters Values Vehicle body, bogie frame, and wheelset masses [kg] m c =34,000, m t =3,000, m w =1,400 Roll, pitch, and yaw moments of inertia of the vehicle body [kg m 2 ] I cx =75.06×10 3 , I cy , I cz =2.086×10 6 Roll, pitch, and yaw moments of inertia of the bogie frame [kg m 2 ] I tx =2,260, I ty =2,710, I tz =3,160 Roll, pitch, and yaw moments of inertia of the wheelset [kg m 2 ] I wx =915, I wy =140, I wz =915 Primary longitudinal, lateral, and vertical stiffnesses [kN/m] K px =10,000, K py =5,000, K pz =750 Secondary longitudinal, lateral, and vertical stiffnesses [kN/m] K sx =150, K sy =150, K sz =400 Primary longitudinal, lateral, and vertical damping coefficients [kNs/m] C px =12, C py =12, C pz =15 (450)

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Lateral Stability and Steady State Curving Performance of Unconventional Rail Trucks.

Cited by 6 publications

References 19 publications

Railway carriage simulation model to study the influence of vertical secondary suspension stiffness on ride comfort of railway carbody

Railway carriage simulation model to study the influence of vertical secondary suspension stiffness on ride comfort of railway carbody

Development of a reduced dynamic model for comfort evaluation of rail vehicle systems

A parametric dynamic study on hunting stability of full dual-bogie railway vehicle

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