Experimental study on vibration displacement of a CRH<inf>2</inf> EMU under strong wind conditions

Abstract

Under strong wind conditions, safety of train operation is seriously being influenced by abrupt change of the aerodynamic force caused by complex terrain and special sections. In this paper, machine vision inspection methods are utilized to vehicle tests conducted on the vibration displacement of a CRH <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> electric multiple units (EMU) running in windy conditions, provide basis for ensure the safety of train operation. Experimental results show that under strong wind conditions, the “car-swaying” phenomenon happened when EMU passing through the transition zone of wind proof structures or mutation zones of landform, whilst parameters such as roll angle of car body and lateral displacement of the center of gravity position change significantly. Under this described test conditions, there was no obvious function law between maximum value of roll angle, lateral displacement of center of gravity position, speed of EMU as well as ambient wind. The maximum values of roll angle and lateral displacement of the center of gravity position of the head car are significantly higher than the corresponding values of the tail car. Among all the typical windproof structures, roll angle of car body and lateral displacement of the center of gravity position have the largest maximum values when EMU running in cutting, which shows the worst windproof effect.