The Nonlinear Finite Element Analysis Of The Drop Length Of The Overhead Catenary System (OCS)

This paper discusses the Overhead Catenary system(OCS)and gets the accurate drop length and the dynamic property about Qin-Shen private line of passenger transport ,one of priority construction of China.The Overhead Catenary system (OCS) is flexible cable structure and it is difficult to calculate accurately by using the traditional computing method.The finite element method is one of capable tools of structural analysis ,but its application in the field of the Overhead Catenary system(OCS) is rare. This paper establishes the model of OCS according to the cable structure and creates nonlinear equation of finite elements method and solves the problem of the counts of drop length.This paper indicates that nonlinear method of finite elements is one of powerful tools of OCS analysis. With this method we establish stiffness matrix and mass matrix and then can compute the drop length accurately, in a way the traditional method is incomparable with FEA ways. The result of FEA is more accurate and economic, so it is an important method in the way of computing the length of drop.In addtion,the author analyses the dynamic property of the OCS with Ansys software and obtain its front ten natural frequencies and models and get some useful conclusions.Finally,a reductionism way is put forward to computing the drop length, it may be useful to the construction budget.