An Efficient Algorithm for Nonlinear Analysis of Vehicle/Track Interaction Problems

Sadeghi, Javad; Khajehdezfuly, Amin; Esmaeili, Morteza; Poorveis, Davood

doi:10.1142/s0219455415500406

Cited by 15 publications

(9 citation statements)

References 24 publications

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“…In order to investigate the effects of track and rolling stock parameters on the TRC, a 2D numerical model of vehicleslab track dynamic interaction was developed in this study. This model is an upgraded/improved version of the one developed by these authors in (Sadeghi et al 2016a(Sadeghi et al , 2019. In the new model, the concrete slab is simulated as a continuous layer, which has less computational cost compared to the original one.…”

Section: Development Of Vehicle-track Modelmentioning

confidence: 99%

“…where is the contact force between the wheel and the rail, ℎ stands for the wheel vertical displacement, is the rail vertical displacement of the wheel-rail contact point, stands for the rail irregularity and is the Hertz spring constant. The stiffness, mass and damping matrices of the whole model were derived by assembling the stiffness, mass and damping matrices of the sub-models (Askarinejad and Dhanasekar 2016, Khajehdezfuly 2019, Sadeghi et al 2016a, 2016b, Sadeghi et al 2019. The vehicle-slab track dynamic interaction equation was solved using Advanced Solution Algorithm (ASA) developed by Sadeghi et al (2016a).…”

Section: Development Of Vehicle-track Modelmentioning

confidence: 99%

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Development of train ride comfort prediction model for railway slab track system

Sadeghi

Rabiee

Khajehdezfuly

2020

Lat. Am. j. solids struct.

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Despite considerable importance of train ride comfort (TRC) in railway slab tracks, there is no TRC prediction model for the slab tracks in the available literature. In this regard, a practical TRC prediction model was developed in this research, taking into account all the track and rolling stock influencing parameters. For this purpose, a vehicle/slab-track interaction model was developed. The model was validated using the results obtained from a comprehensive field test. The effects of rail pad, resilient layer, subgrade, properties of rolling stock suspension systems and vehicle speed on the TRC were studied through a parametric study of the model in which random rail irregularities with various severities were considered. The results obtained were used to develop the TRC prediction model. The accuracy of the model predictions was evaluated by comparing them with those obtained from a railway field. It was shown that the TRC prediction model developed here is a reliable tool for estimation of the TRC from slab track properties, rolling stock parameters and track irregularities. Applicability of the model in the real world of practice is illustrated.

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Section: Development Of Vehicle-track Modelmentioning

confidence: 99%

Section: Development Of Vehicle-track Modelmentioning

confidence: 99%

Development of train ride comfort prediction model for railway slab track system

Sadeghi

Rabiee

Khajehdezfuly

2020

Lat. Am. j. solids struct.

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“…Many studies have been conducted with the vehicle-slab track coupled model including the comparison of two-and threedimensional models [16], the comparison of two-layered and three-layered slab tracks [17], the comparison of linear and nonlinear Hertzian contact theory [18], and the dynamic effects under different irregularities [19][20][21]. Furthermore, many efficient algorithms have been put forward to solve the nonlinear vehicle-track interaction problem [22][23][24][25]. ese studies provide a basis for studying the vibration responses under defects.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Vibration Responses in High-Speed Railways considering Mud Pumping Defect

Shao

et al. 2019

Shock and Vibration

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As a newly appeared defect under slab tracks in high-speed railways, mud pumping weakens the support ability of the subgrade to slab track, bringing about deviations on the vibration responses of the vehicle, slab track, and subgrade. Therefore, this paper proposes a vehicle-slab track-subgrade coupled model based on the multibody simulation principle and the finite element theory to highlight the influences of mud pumping defect. As an external excitation to this model, random track irregularity is considered. In order to simulate the mud pumping defect, the contact between the concrete base and subgrade is described as a spring-damper system. This model is validated by field test results and other simulation results, and a very good agreement is found. The vibration responses of the vehicle, slab track, and subgrade under different mud pumping lengths and train speeds are studied firstly. The deviations of vibration responses in high-speed railways induced by mud pumping are then obtained, and the limited mud pumping length is put forward finally to provide a recommendation for maintenance works of high-speed railways in practice.

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“…Neves et al [14] and Montenegro et al [15] used the Alpha method, an improvement of the Newmark method, for analyzing the nonlinear vehicle structure. Sadeghi et al [16] used the Newmark Beta integration method together with full Newton-Raphson incremental iterative to solve the equations of motion of the vehicle-track system which can reduce computational cost. Uzzal et al [17] used the Rayleigh-Ritz method to solve the coupled equations of the vehicle-track system by considering wheel flat.…”

Section: Introductionmentioning

confidence: 99%

A Two-Step Composite Time Integration Scheme for Vehicle-Track Interaction Analysis considering Contact Separation

Gao

2019

Shock and Vibration

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The two-step composite time integration scheme is combined with the linear contact relation between the wheel and rail (termed the two-step method) to solve coupled vehicle-track dynamic problems. First, two coupled vehicle-track models with different degrees-of-freedom are constructed, in which a vehicle-track system is modeled as two subsystems and the interaction between the two subsystems is implemented via kinematic constraints. Then, the two-step method is applied in the models to simulate several cases, and the accuracy and efficiency of this method are discussed in comparison with additional methods of the Newmark family. Contact separation can also be simulated using the same scheme without causing spurious oscillations for large integration steps. The results indicate that track irregularities can cause wheels to momentarily lose contact with the track, causing large impacts between the wheels and rail. Additionally, with the increase of the running velocity, contact separation will occur more frequently. The adoption of the two-step integration method can ensure the accuracy of solutions and significantly increase the computational efficiency; moreover, the matrixes representing the model information will not change during the calculation process, so the substructure data exported from commercial finite element software can be directly adopted.

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An Efficient Algorithm for Nonlinear Analysis of Vehicle/Track Interaction Problems

Cited by 15 publications

References 24 publications

Development of train ride comfort prediction model for railway slab track system

Development of train ride comfort prediction model for railway slab track system

Numerical Analysis of Vibration Responses in High-Speed Railways considering Mud Pumping Defect

A Two-Step Composite Time Integration Scheme for Vehicle-Track Interaction Analysis considering Contact Separation

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