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

Graa, Mortadha; Nejlaoui, Mohamed; Houidi, Ajmi; Affi, Zouhaier; Romdhane, Lotfi

doi:10.1177/1464419315627914

Cited by 7 publications

(11 citation statements)

References 34 publications

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“…To simplify the full model, the following assumptions on the DOF of the system are made. 24 The DOF of the obtained model drops from 60 for the full model to 38 for the reduced model. 24 To reduce the computational complexity, the Hertzian spring stiffness effect is considered as linear in the vertical ( k hz ) and the lateral direction ( k hy ) (Figure 2).…”

Section: Dynamic Model Of the Reduced Dof Rvmentioning

confidence: 98%

“…The different creep force and moment components (longitudinal, lateral and spin creep moments) are calculated from Kalker's linear theory. 25 They are given in Graa et al 24 The reduced dynamic model of the RV system is derived by the Lagrange approach. The equations of motion for the wheel-sets are given in Graa et al 24 The equations of motion of the bogie are…”

Section: Dynamic Model Of the Reduced Dof Rvmentioning

confidence: 99%

“…The equations of motion are solved in MATLAB using the Runge-Kutta method. 27 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 in the work of Graa et al 24…”

Section: The Dynamic Rv Model Validationmentioning

confidence: 99%

See 2 more Smart Citations

Mechatronic suspension design for full rail vehicle system

Graa

Nejlaoui

Houidi

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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Section: Dynamic Model Of the Reduced Dof Rvmentioning

confidence: 98%

Section: Dynamic Model Of the Reduced Dof Rvmentioning

confidence: 99%

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Mechatronic suspension design for full rail vehicle system

Graa

Nejlaoui

Houidi

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…However, in the lateral direction the wheelsets are effectively unconstrained on the railhead (except by flange contact) allowing relative displacement in the lateral direction between the wheels and rails, especially during curving. Model complexity for ride analysis has been studied by Graa et al 29 .…”

Section: Introductionmentioning

confidence: 99%

Effect of train speed and track geometry on the ride comfort in high-speed railways based on ISO 2631-1

Chi

Thompson

Griffin

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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The operational speeds of passenger trains have been increasing and now often exceed 300 km/h. Higher speeds can lead to increased vibration and reduced ride comfort for railway passengers. This study investigates the combined effect of speed and track geometry on vibration discomfort in high-speed trains. Railway vehicle dynamic models with various levels of complexity are used, with the measured geometry of a section of a high-speed track as an input. The models have been calibrated with vibration measurements carried out in a train running over this section of the track and then applied to predict the vibration discomfort at increased speeds. To evaluate the vibration discomfort at speeds up to 400 km/h, information on track geometry should include wavelengths up to at least 150 m. Vertical irregularities have the greatest effect at all speeds but lateral irregularities are also important. Both the vertical and lateral irregularities of a high-speed track should be controlled at wavelengths of 50–100 m that excite rigid modes of the car body, corresponding to frequencies of typically 1–2 Hz. Additionally, vertical irregularities with wavelengths of 5–12 m that excite the fundamental flexible mode of the car body, typically around 10–15 Hz, should also be controlled. The effects of cant, the rates of change of cant, and the radius of vertical curves are also evaluated although they only have a small effect on vibration discomfort.

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“…This method is quite reliable even if the number of DoF and sample size is large enough. Many researchers [7][8][9] focused their research on active suspension systems for rail-vehicles and proposed the same to other practical applications. Active suspension systems consist of pneumatic actuators and oil cylinders.…”

Section: Introductionmentioning

confidence: 99%

Ride comfort of a higher speed rail vehicle using a magnetorheological suspension system

Sharma

Kumar

2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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In a railway vehicle, vibrations are generated due to the interaction between wheel and track. To evaluate the effect of vibrations on the ride quality and comfort of a passenger vehicle, the Sperling's ride index method is frequently adopted. This paper focuses on the feasibility of improving the ride quality and comfort of railway vehicles using semiactive secondary suspension based on magnetorheological fluid dampers. Equations of vertical, pitch and roll motions of car body and bogies are developed for an existing rail vehicle. Moreover, nonlinear stiffness and damping functions of passive suspension system are extracted from experimental data. In view of improvement in the ride quality and comfort of the rail vehicle, a magnetorheological damper is integrated in the secondary vertical suspension system. Parameters of the magnetorheological damper depend on current, amplitude and frequency of excitations. Three semi-active suspension strategies with magnetorheological damper are analysed at different running speeds and for periodic track irregularity. The performance indices calculated at different semi-active strategies are juxtaposed with the nonlinear passive suspension system. Simulation results establish that magnetorheological damper strategies in the secondary suspension system of railway vehicles reduce the vertical vibrations to a great extent compared to the existing passive system. Moreover, they lead to improved ride quality and passenger comfort.

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

Cited by 7 publications

References 34 publications

Mechatronic suspension design for full rail vehicle system

Mechatronic suspension design for full rail vehicle system

Effect of train speed and track geometry on the ride comfort in high-speed railways based on ISO 2631-1

Ride comfort of a higher speed rail vehicle using a magnetorheological suspension system

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