An Extension of FASTSIM for Steady State Non-Hertzian Contact

Qazi, Aquib; Sébès, Michel; Chollet, Hugues; Yin, Haiping; Pozzolini, Cédric

doi:10.1007/978-3-031-07305-2_50

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…In VOCO, the contact patch is discretised using strips, in each one of which the creepages are defined, as shown in Figure 6(c). us, the Polach Method [56] is used in MUBODyn, while VI-Rail uses FASTSIM, as presented in [52], VOCO uses a functional approximation of FASTSIM adapted for non-elliptical contact patches by using the local properties of each strip [38,57].…”

Section: Creep Forcesmentioning

confidence: 99%

Wheel-rail contact models in the presence of switches and crossings

Magalhães

Marques

Antunes

et al. 2022

Vehicle System Dynamics

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Multibody codes are widely used to model and study the operation of railway vehicles on realistic track, where the wheel-rail contact model is the key to represent the vehicle-track interaction forces. However, the development and implementation of wheel-rail contact models in multibody codes remain two active research topics, aiming at improving the accuracy of numerical results and computational efficiency of the dynamics analysis. The realism of numerical results is challenged when considering switches and crossings (S&C), where the most adverse wheel-rail contact conditions occur. This paper presents a benchmark study where the performance of the multibody codes MUBODyn, VOCO and VI-Rail are assessed using three case scenarios that involve typical contact conditions observed in S&C. A focused description of the relevant methods to determine the wheel-rail contact forces is presented for each software. The three scenarios considered in this work have been designed to represent typical challenging contact conditions observed in S&C, i.e. conformal contact, contact with a sharp edge, and impact loads. The scenarios proposed in this work are fully described, making them easily reproducible. The agreement between results is discussed in the framework of the methods implemented in each code. This work highlights the impact of wheelrail contact methods on the results as well as on the computational efficiency of the multibody codes.

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Section: Creep Forcesmentioning

confidence: 99%

Wheel-rail contact models in the presence of switches and crossings

Magalhães

Marques

Antunes

et al. 2022

Vehicle System Dynamics

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“…The two-dimensional numerical simulation on the subsurface stress field in Hertzian contact under pure sliding condition for different speeds and coefficients of friction is studied applying normal load and angular speed for the cylinder. Quazi et al [23] proposed a strip-based local approach to extend the FASTSIM algorithm to non-elliptical contact cases. Different settings for the traction bound are explored to determine their influence on the contact stresses, creep forces, and the limits of the saturation zone in the case of wheel-rail contact.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Vibro-Impact Nonlinear Damped and Forced Oscillator in the Dynamics of the Electromagnetic Actuation

et al. 2023

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In this work, the effect of vibro-impact nonlinear, forced, and damped oscillator on the dynamics of the electromagnetic actuation (EA) near primary resonance is studied. The vibro-impact regime is given by the presence of the Hertzian contact. The EA is supplied by a constant current generating a static force and by an actuation generating a fast alternative force. The deformations between the solids in contact are supposed to be elastic and the contact is maintained. In this study, a single degree of freedom nonlinear damped oscillator under a static normal load is considered. An analytical approximate solution of this problem is obtained using the Optimal Auxiliary Functions Method (OAFM). By means of some auxiliary functions and introducing so-called convergence-control parameters, a very accurate approximate solution of the governing equation can be obtained. We need only the first iteration for this technique, applying a rigorous mathematical procedure in finding the optimal values of the convergence-control parameters. Local stability by means of the Routh-Hurwitz criteria and global stability using the Lyapunov function are also studied. It should be emphasized that the amplitude of AC excitation voltage is not considered much lower than bias voltage (in contrast to other studies). Also, the Hertzian contact coupled with EA is analytically studied for the first time in the present work. The approximate analytical solution is determined with a high accuracy on two domains. Local stability is established in five cases with some cases depending on the trace of the Jacobian matrix and of the discriminant of the characteristic equation. In the study of global stability, the estimate parameters which are components of the Lyapunov function are given in a closed form and a graphical form and therefore the Lyapunov function is well-determined.

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An Extension of FASTSIM for Steady State Non-Hertzian Contact

Cited by 2 publications

References 15 publications

Wheel-rail contact models in the presence of switches and crossings

Wheel-rail contact models in the presence of switches and crossings

Analysis of the Vibro-Impact Nonlinear Damped and Forced Oscillator in the Dynamics of the Electromagnetic Actuation

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