A5048376607- Magnetic Bearings and Levitation Dynamics
- Railway Engineering and Dynamics
- Civil and Geotechnical Engineering Research
- Tribology and Lubrication Engineering
- Vibration and Dynamic Analysis
- Structural Behavior of Reinforced Concrete
- Probabilistic and Robust Engineering Design
- Infrastructure Maintenance and Monitoring
- Traffic Prediction and Management Techniques
- Magnesium Alloys: Properties and Applications
- Concrete Corrosion and Durability
- Geotechnical Engineering and Underground Structures
Northwestern Polytechnical University
2020-2024
Abstract The characterization of track irregularities is crucial in railway dynamics, as are the primary source internal excitation systems. In this paper, three mathematical models proposed to characterize under different circumstances. first model a novel explicit spectrum function, which performs better reflecting inherent periodic components than existing spectra. On foundation, second model, parameterized random represent vast measured from probabilistic perspective. Finally, third an...
The structure of low-to-medium–speed maglev trains significantly differs from that traditional wheel/rail trains, leading to significant differences between the coupling vibration mechanism train and bridge systems. To determine vertical dynamic interaction train–bridge system, a model was established studied, based on proportional–integral–derivative active suspension control system modal superposition method. simulation validated through field tests Changsha commercial line....
The deflection ratio of the bridge is an important design parameter influencing stability low-to-medium speed maglev train by affecting levitation gap. This study focuses on dynamic interaction and bridges with different vertical ratios investigates required for train. experimental investigation carried out first. Then, a numerical model established verified based field tests. And then, influence 25 m simply supported girder responses discussed, as well same but span lengths. Finally,...
To investigate the dynamic performance of low-to-medium-speed (LMS) maglev train and bridge system under uneven ground settlement, a refined vertical interaction model LMS train–track–bridge with settlement is proposed. Firstly, numerical verified based on field test. Secondly, performances induced by settlements are numerically analyzed. Furthermore, studies carried out to effect various types, compare two typical bridges, assess contribution F-rail in presence settlement. The results show...
As a novel type of non-mechanical contact rail transit, the maglev vehicle is stabilized by actively controlled levitation forces without contact. The steel bridge exhibits complex self-vibration characteristics with dense high-frequency vibration modes. gap and force are disturbed vehicle-induced deformation bridge, significant moving vehicle–steel coupled phenomena occur. To solve this problem, mechanism on should be understood. This paper establishes detailed models theoretical dynamic...
The at-ground-structure supports the maglev track on subgrade segment and receives subgrade’s equally distributed elastic support to ensure holding running of train. A complicated train-track-at-ground-structure coupled system is produced, negatively affecting stable operation To explore vibration mechanism, an elaborate was established considering active levitation control, field tests confirmed reliability numerical method. Firstly, natural frequencies track-at-ground-structure were...
Improving the running speed on in-service commercial LMS maglev transit is most cost-effective way to enhance carrying capacity. The increasing will disturb train’s lateral guidance performance, and further affects vibration performance of train track-bridge system. In order explore coupling train-track-bridge system under speed-up state, a filed test for Changsha express at various speeds carried out data responses analyzed. Then, refined theoretical model established proved through this...