<b>Numerical Simulation of Train-induced Vibration in Consideration of Types of Excitation Forces</b>

Abstract

Vibrations caused by running trains sometimes lead to environmental issues. Traininduced vibrations are caused by moving static and dynamic axle loads. In numerical simulations of train-induced vibration, the type of excitation force greatly affects the relevant structure and ground responses. This study evaluated the influence of excitation force types on ground responses. Numerical simulations demonstrated that at frequencies below or equal to 31.5 Hz, a large part of the ground vibration caused by moving excitation forces consists of averaged components such as moving static axle loads. On the other hand, the simulations also showed that at frequencies equal to or over 40 Hz, a large part of the ground vibration due to moving excitation forces consists of varying components such as dynamic axle loads. Furthermore, it was found that there is a frequency at which the moving excitation force accelerance nears the point force excitation accelerance. It was then clarified that the point force excitation accelerance at that frequency can be used as a substitute for moving excitation forces.