Yixuan Shi

Point Cloud-Based Measurement of Switch Rail-to-Sleeper Longitudinal Displacement with Multi-Bolt Reference

Cuijun Dong, Qingzhou Mao, Shihao Zhang, Zongming Zhang et autres

The longitudinal displacement of the switch rail relative to the sleeper is a critical defect affecting the safety of railway switching operations, as the sleeper serves as the mounting base for the switch machine. Existing measurement methods that rely on the stock …

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Dynamic Derailment Behavior and Anti-Derailment Performance Analysis of High-Speed Electric Multiple Units

Yixuan Shi, Qingzhou Mao, Huailong Shi, Hao Gao et autres

For high-speed electric multiple units, derailment may lead to severe vehicle instability and safety hazards, making it essential to understand post-derailment dynamic behavior and protective mechanisms. To elucidate the dynamic evolution characteristics and anti-derailment mechanisms of high-speed electric multiple units under derailment …

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Rail surface defect segmentation via strip-aware deformable convolution and spectral deformable transformer

Wang Tong, Qinzhou Mao, Yixuan Shi, Haoxuan Xu et autres

Abstract Accurate segmentation of rail surface defect regions is critical to the safe operation of railway systems. To achieve precise rail defect segmentation, a segmentation approach that integrates deformable convolution with a spectral–deformable transformer was proposed. A multi-scale strip-aware orientation-constrained deformable convolution …

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Abnormal vibration characteristics and modal coupling mechanism of low-floor tram gearbox

Yixuan Shi, Qingzhou Mao, Huanyun Dai, Q.X Wang et autres

Abnormal vibration of gear transmission systems is one of the key factors affecting the operational reliability of tram vehicles. However, the vibration characteristics and excitation mechanisms of gearbox systems under actual operating conditions are not yet fully understood. In this study, field …

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A novel monitoring framework for hunting motion of railway vehicles and its experimental validation on a roller rig

Qunsheng Wang, Yuncheng Chen, Lai Wei, Rancheng Mao et autres

While structural health monitoring has largely focused on detecting material degradation and stiffness loss, dynamic instability remains an overlooked failure mode. This study addresses railway vehicle hunting motion, a self-excited oscillation that evolves into sustained instability under adverse conditions. A novel health …

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Investigation on the causes of abnormal vertical shaking of high-speed EMU carbody

Yixuan Shi, Qingzhou Mao, Sheng Yang, Cuijun Dong et autres

• Field tests revealed abnormal carbody vertical shaking in a high-speed EMU at 38 Hz. • Traction motor excitations triggered the bogie torsional mode during acceleration. • Coupling with carbody local bending modes amplified the vertical vibration response. • A rigid-flexible coupled …

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Dynamic Derailment Behavior and Anti-derailment Performance Analysis of High-speed EMU

Yixuan Shi, Qingzhou Mao, Huailong Shi, Hao Gao et autres

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Wheel polygonal wear of metro vehicles caused by wheel-rail P2 force resonance

Yixuan Shi, Qingzhou Mao, Huanyun Dai, Cuijun Dong

Wheel polygonal wear significantly affects vibration performance of rail vehicles. In this study, dynamic track test is carried out and dynamical modelling for a vehicle-track vertical coupling system is developed. Results show that the wheel polygonal wear of order 7-9 occurs in …

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Research on Wheel Polygonal Wear of Metro Vehicles Based on Wheel/Rail Vertical Coupling

Yixuan Shi, Qingzhou Mao, Cuijun Dong, Huanyun Dai et autres

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Dynamic modelling and simulation of metro train collision and derailment

Hao Gao, Yixuan Shi, Huailong Shi, Jingmang Xu et autres

Abstract To investigate the dynamic response and instability mechanisms of urban rail vehicles under extreme collision and derailment scenarios, a high-fidelity dynamic simulation model of a metro train system was developed based on the ADAMS/Rail platform. The model integrates three-dimensional nonlinear contact …

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Dynamic Modelling and Response Research on Derailment Protection of High-Speed EMU

Yixuan Shi, Qingzhou Mao, Huailong Shi, Qunsheng Wang et autres

High-speed electric multiple units (EMUs) are exposed to derailment risks under extreme scenarios such as collisions or foreign object intrusions, posing serious threats to railway operational safety. To address this issue, a vehicle–track coupled dynamics model incorporating nonlinear wheel–rail interaction and 3D …

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Parametric resonance induced by bridge excitation in high-speed trains: mechanisms and suppression measures

Qunsheng Wang, Y. P. Pei, Rancheng Mao, Jing Zeng et autres

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