Modeling of Pantograph under Sliding Friction using FMBD and Stability Analysis

Abstract

Sliding of the pantograph head and contact wire causes frictional force acting on traveling pantograph head in horizontal direction. If the coefficient of friction between the pantograph head and contact wire is large, unstable vibration of the traveling pantograph could be observed. To analyze this vibration, a 2-dof pantograph model considering frictional force acting on the pantograph head based on the multi-body dynamics (MBD) has been proposed. However, elastic deformation of each element of the pantograph is not studied in this model. Therefore, this study proposes a pantograph model that considers friction characteristics of the pantograph based on the flexible multi-body dynamics (FMBD) approach. In this paper, a single-arm pantograph for shinkansen train is modeled using the FMBD technique. In addition, a stability analysis method based on the complex eigenvalue analysis for the pantograph model is proposed. Furthermore, excitation test of actual pantograph for Shinkansen train is carried out to identify its dynamic characteristics. Then mode shapes and natural frequencies of the pantograph are identified. Moreover, the stability analysis based on the complex eigenvalue analysis is carried out using identified parameters.