Effect of Track Irregularities on the Response of Two-Way Railway Tracks

Javaid, Omer; Choi, Dong Ho

doi:10.3390/app10010011

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…The track irregularities have been defined with the step of 0.5 m. An illustration of track irregularities used in the track model is in Figure 6. This track model has led to the generation of rail vehicle excitations and to related observable dynamical effects [60][61][62].…”

Section: A Description Of a Railway Track Modelmentioning

confidence: 99%

Assessment of Dynamics of a Rail Vehicle in Terms of Running Properties While Moving on a Real Track Model

et al. 2022

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Simulation computations represent a very effective tool for investigating operational characteristics and behaviours of vehicles without having a real product. The rail vehicles sector is typical, in that simulation computations including multibody modelling of individual vehicles (i.e., wagons) as well as entire trainsets are widely used. In the case of designing rail vehicles, running safety and ride comfort are two of the most important assessment areas. The presented work is focused on the research of the dynamical effects of a rail vehicle while running on a railway track created in a commercial multibody model. There is a lot of research focused on the investigation of dynamic performances while a rail vehicle is running on a flexible railway track. The real operation of a rail vehicle meets problems on track, where the stiffness-damping parameters of a railway track vary in transient sections (e.g., the exit of a tunnel). This work brings a contribution to research related to the assessment of the dynamic response of a rail vehicle on a chosen track section. A passenger railway vehicle is chosen as a reference multibody model. Simulation computations were performed for three different railway track models, i.e., for a rigid track model and for a flexible track model defined in two different manners. The stiffness-damping parameters of the rail vehicle are defined symmetrically in relation to the longitudinal axis of the vehicle, e.g., they are the same values for the left and right side. The centre of gravity is not located symmetrically, but it is partially shifted in the lateral direction. This can be observed in the results of wheel forces and their waveforms. There are evaluated values and waveforms of the vertical wheel forces, the lateral wheel forces and the derailment quotient. The obtained results have revealed the influence of the railway track formulation in the model on the output parameters.

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Section: A Description Of a Railway Track Modelmentioning

confidence: 99%

Assessment of Dynamics of a Rail Vehicle in Terms of Running Properties While Moving on a Real Track Model

et al. 2022

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“…Our model includes track irregularities measured on the track. Thus, such a track model generates excitation of the vehicle and acceleration signals can be detected [68][69][70].…”

Section: A Description Of a Track Modelmentioning

confidence: 99%

Evaluation of Ride Comfort in a Railway Passenger Car Depending on a Change of Suspension Parameters

Dižo

Blatnický

Gerlici

et al. 2021

Sensors

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Ride comfort for passengers remains a pressing topic. The level of comfort in a vehicle can influences passengers’ preferences for a particular means of transport. The article aims to evaluate the influence of changes in suspension parameters on the ride comfort for passengers. The theoretical background includes a description of the applied method for a creating the virtual model of an investigated vehicle as well as the method of evaluating the ride comfort. The ride comfort of the vehicle is assessed based on the standard method, which involves calculating the mean comfort method, i.e., ride comfort index NMV in chosen points on a body floor. The NMV ride comfort index (Mean Comfort Standard Method) requires the input of acceleration signals in three directions. The rest of the article offers the results of simulation computations. The stiffness–damping parameters of the primary and secondary suspension systems were changed at three levels and the vehicle was run on the real track section. The ride index NMV was calculated for all three modifications of the suspension system in the chosen fifteen points of the body floor. It was found that lower values in the stiffness of the secondary suspension system lead to lower levels of ride comfort in the investigated railway passenger car; however, lower values in the stiffness–damping parameters of the primary suspension system did not decrease the levels of ride comfort as significantly.

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“…The running is evaluated as very comfortable (Table 1). Together, comparing these results have shown, that higher running speed causes lower level of passenger ride comfort [20][21][22].…”

Section: Conclusion and Contributionsmentioning

confidence: 75%

Investigation of Passenger Ride Comfort in a Railway Wagon for Various Suspension Parameters

Dižo¹,

Blatnický²,

Gerlici³

et al.

Civil-Comp Conferences

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Comfort for passenger in rail vehicles is still currant topic. Passengers often choose the preferred kind of transport just based on the comfort level. This article is focused on the investigation of passenger ride comfort in a railway wagon for various suspension parameters. The theoretical approach comes from a description of the applied method necessary to create a virtual model of an evaluated railway wagon and it also includes the method for evaluation of the passenger ride comfort. The passenger ride comfort in a wagon is evaluated by means of the standard method, at which, the passenger ride comfort indices marked as NMV in the determined locations on a wagon body floor are calculated. The calculation of the passenger ride comfort NMV index requires to know values of the accelerations signals in all three directions as an input. The section of the article presents the obtained results of simulation computations. There were changed the stiffness-damping parameters of the primary and secondary suspension system and their values have been changed in three levels. The railway wagon vehicle has been running on a model of a real track section. The passenger ride indices NMV have been calculated for all three variants of the wagon fifteen points located on the wagon body floor. The research results have shown, that lower values of stiffness of the secondary suspension system affects the passenger ride comfort more significantly than the lower values of stiffness-damping parameters of the primary suspension.

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Effect of Track Irregularities on the Response of Two-Way Railway Tracks

Cited by 8 publications

References 33 publications

Assessment of Dynamics of a Rail Vehicle in Terms of Running Properties While Moving on a Real Track Model

Assessment of Dynamics of a Rail Vehicle in Terms of Running Properties While Moving on a Real Track Model

Evaluation of Ride Comfort in a Railway Passenger Car Depending on a Change of Suspension Parameters

Investigation of Passenger Ride Comfort in a Railway Wagon for Various Suspension Parameters

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