Dynamic Analysis of the High Speed Train-Track Spatial Nonlinear Coupling System Under Track Irregularity Excitation

Article Engineering, Geological

Three-dimensional train-track-bridge coupled dynamics model based on the explicit finite element method

Zhi-Ping Zeng et al.

Summary: In this paper, a train-track-bridge coupled dynamics modeling and coupling method is proposed. The method uses finite element method to model the coupled dynamic system as multiple subsystems separately, and the threedimensional nonlinear wheel-rail contact relationship is used to consider non-linearity. By using explicit numerical methods and coupling the subsystems by the load term, repetitive iteration in the dynamic response solution process is avoided, achieving a simplified solution of nonlinear dynamic models in limited time. The modal superposition method is adopted to meet the requirement of diagonalization of the mass matrix. The proposed method only requires a set of mass, damping, and stiffness matrices of the subsystem structure for solution, greatly reducing the dynamic system matrix dimension for periodic train-track-bridge coupled dynamic systems. The train-track bridge coupled dynamics model proposed in this paper is suitable for various track and bridge structures and has higher accuracy in describing the force state between wheel and rail. The effects of different track structures on train operation safety are analyzed using numerical experiments, and the results show that the separation model is preferable for predicting train operation safety.

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING (2022)

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Article Engineering, Civil

Three-Dimensional Vehicle-Curved Track Dynamic Model Based on FEM and DEM

Xianmai Chen et al.

Summary: This work presents a systematic vehicle-curved track dynamic model, including the modeling of the vehicle and track structure, as well as improvements in the discrete element method and iterative-update method, along with the introduction of the improved infinite cyclic calculation method. Through engineering practices and numerical studies, conclusions have been drawn regarding vibration issues caused by vehicles.

INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS (2021)

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Article Engineering, Civil

A Novel Snake-Like Model to Simulate Infinite Track for Vehicle-Track Coupling Vibration

Tao Xin et al.

Summary: The dynamic interaction between vehicles and tracks is crucial for railway safety. Previous models often used only a finite length of track in simulations to reduce computation efforts, but this may overlook long-wavelength track irregularities affecting vehicle responses. This paper presents a novel snake-like model inspired by the game Snake to simulate infinite tracks, showing consistent accuracy with existing methods but significantly reduced computational effort.

INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS (2021)

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Article Acoustics

An advanced train-slab track spatially coupled dynamics model: Theoretical methodologies and numerical applications

Jun Luo et al.

Summary: This paper extends the classical vehicle-track coupled dynamics theory by introducing track flexibility and advanced coupling relations into a three-dimensional train-slab track system. The model takes into account longitudinal coupling effects and flexible lateral vibration of track slab, which are often neglected in conventional dynamics models. The proposed dynamics model has been verified using ANSYS software and co-simulation technique, showing that dynamic responses are sensitive to longitudinal coupling effects and slab in-plane vibration, emphasizing the importance of accurate evaluations on train-slab track interactions.

JOURNAL OF SOUND AND VIBRATION (2021)

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Article Engineering, Civil