Simulation on dynamic envelope gauge of NX70 flat car

Abstract

In railway transportation, the clearance provided between the vehicle and structure gauge is an important safe space. The general rules and methods for inspecting of rolling stock gauge are based on a static gauge in China. Dynamic envelope gauge calculation considers the rolling stock displacement much more than before. The paper combines dynamics simulation with the Standard for Metro Gauge to calculate the dynamic envelope gauge. The lateral static vibration offset caused by the error of manufacturing, installation and maintenance is calculated. The lateral dynamic vibration and the vertical dynamic vibration offset caused by the suspension and wheel/rail gap is obtained by dynamic simulation. According to the current structure gauge, the clearance between the dynamic envelope gauge and the structure gauge can be calculated and the safety of railways operation can be analyzed. As an example, NX70 dynamic simulation model is established. The clearance between the vehicle and structure gauge is enough to curve and straight line when the center height of gravity increased to 2400mm for NX70.