A 3D Dynamic Modeling Method for Catenary Threads Based on Static Balance

Abstract

The invention discloses a three-dimensional dynamic modeling method for catenary clues based on static balance. The finite element theory is used to construct the catenary by using two-node nonlinear elements in space, and the nonlinear finite element modeling based on the combined structure of cables and rods is adopted. Methods: According to the topological relationship of the catenary structure, the stiffness matrix and the unbalanced force matrix are assembled, and the overall nonlinear equilibrium equation is established; the Newton-Raphson method is used to solve the static geometric parameters after the catenary is loaded; based on the static balance of the catenary obtained by the solution Parameters, the three-dimensional catenary model is represented by the triangular patch construction method; the model data such as normal vector and triangular vertex conversion matrix are calculated by using the three-dimensional spatial analytic geometric method; finally, the high-precision three-dimensional digital model of the catenary is automatically generated by real-time rendering. The method of the invention greatly reduces the manual modeling work of catenary designers, and the generated high-precision three-dimensional model provides an accurate model source for later design verification.

Description

technical field [0001] The invention relates to the field of three-dimensional model modeling of an electrified railway catenary, in particular to a three-dimensional dynamic modeling method for catenary threads based on static balance. Background technique [0002] At present, in the catenary 3D BIM (Building Information Modeling) design, the approximate 3D model of the catenary clue structure is generally constructed by manual modeling. The manual modeling method has a large workload, and does not consider the changes in the parameters such as the guide height and pull-out value of the catenary after loading, and once the design parameters change, it is time-consuming and laborious to manually modify the model. Therefore, catenary clue modeling has become a bottleneck link restricting the development of catenary BIM design. The industry urgently needs to study catenary clue data-driven automatic construction that can meet design data association, model automatic change, an...

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Problems solved by technology

[0003] The current railway modeling research mainly focuses on the on-site data collection of real railway objects in the real world and the research on the method of reconstructing the real railway objects according to the collected data, and most of the physical objects of railways are concentrated in the models of railway lines, buildings, geological terrains, etc. Research on 3D Parametric Dynamic Modeling of Nets

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