Static Form-Finding Analysis Of Flexible Suspension Overhead-Catenary System

In this paper, by using ANSYS, procedures about flexible suspension overhead- catenary system are programmed to accomplish the parameterization input and the form-finding computation.The static form-finding of the catenary is to make sure the best combination of curve shape-prestress state on the given support and boundary condition, which satisfy the requirement of the catenary system. That is to say, considering the gravity, the catenary is hanged to designed height.First, the calculation model of catenary is established, the static differential equations of equilibrium are derived, and the technical theories relative to various parts of the model are described. To meet the functional requirements of the software, the procedure is programmed to set up the parameterization model of the catenary by means of scalar parameters, array parameters and while loops. Considering that the catenary is a flexible suspension structure, it has the nonlinear computation characteristic, so we need to open the corresponding nonlinear analysis option, load the gravity to solve its deformation, and then add the displacement to nodes of the definite element model, extract update coordinates of the contract wire, calculate their differences between the designed values, which are used to reduce the length of droppers so as to raise the contract wire. By cycling the above process, the contract wire is gradually lifted to the designed height. At last, numerical examples are put forward to illustrate the implementation of simulation procedures. The static form-finding of the simple stiched catenary and the elasticity catenary are studied and droppers'lengths are obtained. Based on the update forming, the static elasticity is solved as the preliminary judgment standard of current collection. Besides, important measures about high-precision suspension and improvement of the static elasticity are proposed too.Proved through examples, the procedure can accomplish parametric inputting of the catenary system and accurate calculation of the droppers, which can be used to the computation and installment of the droppers and the erection of the catenary.