A comprehensive review on coupling vibrations of train–bridge systems under external excitations

In recent years, high-speed railways in China have developed very rapidly, and the number and span of the railway bridges are keeping increasing. Meanwhile, frequent extreme disasters, such as strong winds, earthquakes and floods, pose a significant threat to the safety of the train–bridge systems. Therefore, it is of paramount importance to evaluate the safety and comfort of trains when crossing a bridge under external excitations. In these aspects, there is abundant research but lacks a literature review. Therefore, this paper provides a comprehensive state-of-the-art review of research works on train–bridge systems under external excitations, which includes crosswinds, waves, collision loads and seismic loads. The characteristics of external excitations, the models of the train–bridge systems under external excitations, and the representative research results are summarized and analyzed. Finally, some suggestions for further research of the coupling vibration of train–bridge system under external excitations are presented.

     

A dynamic model with substructures for contact-impact analysis of flexible multibody systems

In the fields of science and engineering, many kinds of impact problems of flexible multi-body systems, such as impact of objects on a spacecraft and collision caused by locking of space-craft extension mechanisms, are frequently encountered. They are referred to as contact-impact problems when people are not interested in the local deformation close to contact points but in the transient dynamic response in contact-impact duration. It is necessary to investigate contact- impact dynamics of f…     

An efficient method for train–track–substructure dynamic interaction analysis by implicit-explicit integration and multi-time-step solution

In this work, a method is put forward to obtain the dynamic solution efficiently and accurately for a largescale train–track–substructure(TTS) system. It is called implicit-explicit integration and multi-time-step solution method(abbreviated as m I-n E-MTS method). The TTS system is divided into train–track subsystem and substructure subsystem. Considering that the root cause of low efficiency of obtaining TTS solution lies in solving the algebraic equation of the substructures, the high-efficie...