Investigation of rail irregularity effects on wheel/rail dynamic force in slab track: Comparison of two and three dimensional models

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

doi:10.1016/j.jsv.2016.03.033

Cited by 51 publications

(21 citation statements)

References 15 publications

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“…The vibration of bogies passing to carbodies was attenuated to 1/30, and the vibrations of bogies and carbodies were effectively restrained. Through theoretical analysis and field testing, the results proved that the suspension of a locomotive has excellent attenuation characteristics and is consistent with the research of Zhai et al 5,10 Presently, the traditional vehicle dynamics modeling [1][2][3][4][5]29,30 ignores bearing coupled characteristics and simplifies the axle box and wheelset to a whole component. However, as illustrated in Figure 7(a) and (b), the vertical and lateral accelerations of the axle box were 18.7% and 23.3% higher than those of the wheelset, respectively; therefore, the vibration acceleration responses of a wheelset and an axle box differ greatly.…”

Section: Discussionsupporting

confidence: 82%

“…Scholars have given more attention to the dynamic characteristic of complete vehicle or vehicle-track system, without taking into account the effect of nonlinear contact force of the axle box bearings. [1][2][3][4][5] Based on the modular method, a three-dimensional dynamic vehicle-track coupled dynamics was established by Liu et al, 1 considering the large creep of wheel-track contact. A finite element model of the vehicle was calibrated using experimental modal parameters.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic investigation on railway vehicle considering the dynamic effect from the axle box bearings

Sun

Meng

et al. 2019

Advances in Mechanical Engineering

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The nonlinear load of the axle box bearing and the spatially coupled relationship of vehicles have seldom been considered in the dynamic modeling of vehicle-track systems in recent years. Therefore, based on the time-varying nonlinear contact load of an axle box bearing, a vehicle spatially coupled dynamic model is established. Subsequently, the vehicletrack spatially coupled dynamic model is established by the dynamic coupled relationship between the wheel and rail. Finally, the vehicle wheelset testbed is set up to verify the correctness of the theoretical model. Experimental results show that (1) the vibration of an axle box has a strong nonlinear coupled relationship. The axle box vertical amplitude aroused by lateral alternating load is approximately 0.108 mm, which was approximately 22.2% of the lateral vibration and (2) the lateral displacement and acceleration errors of axle box between the simulation and experiment are about 5.7% and 6.9%, respectively, which validates the theoretical model. The vehicle-track spatially coupled dynamic model accurately reflects the vibration characteristics of locomotives under track irregularity and provides theoretical support for the design of key components, such as axle box bearings.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Dynamic investigation on railway vehicle considering the dynamic effect from the axle box bearings

Sun

Meng

et al. 2019

Advances in Mechanical Engineering

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“…At present, numerical simulation has become an efficient solution to study the dynamic effects of railways with the development of computer science [14,15]. 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].…”

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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“…Vibrations of the vehicle are transmitted to the track through wheel-rail contact, resulting in the excitation of track vibrations, which is in reverse act on the vehicle [1]. Meanwhile, the wheel flat [2] and track irregularities [3] are input to the coupled system via the wheel-rail force which significantly amplifies the dynamic interaction and generally displays nonlinear properties. e computational cost is greatly increased.…”

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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Investigation of rail irregularity effects on wheel/rail dynamic force in slab track: Comparison of two and three dimensional models

Cited by 51 publications

References 15 publications

Dynamic investigation on railway vehicle considering the dynamic effect from the axle box bearings

Dynamic investigation on railway vehicle considering the dynamic effect from the axle box bearings

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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