Research On Railway Vehicle Axle Parametric Design System

There are various kinds of railway rolling stock axles, but the structure is relatively simple and standard.The introduction of parametric technology will greatly improve the design efficiency. The axle strength calculation should be performed in accordance with EN 13103 and EN 13104, which provide limited algorithm.New strength calculation algorithm should be deduced by designers to check the axles which haven’t been included in the standard yet.It’s significant for the implementation of checking various axles strength to construct axle system mechanical model based on basic mechanics principles.Under Windows operation system, a parametric design system of railway vehicle axle is developed on UG platform by using mixed programming technology, AFV(Abstract Fuse Verification) technology,and load abstract technology.The thesis studies the secondary development of UG technology based on C#.NET, parameter assignment of axle, and mixed programming technology. Due to the advantages in terms of syntax, interface and development framework, UG Open API and C#.NET are adopted for secondary development of UG. A new method of visually assigning parameter is achieved,which simplifies the parameter assigning process. The system is developed by using C#, Fortran and C++,and the user interface, numeric calculation part and nephogram part are written in C#, Fortran and C++ respectively. The design and realization of this system fully utilized C#, Fortran and C++.New parametric method in varied structure designing has been studied.The traditional parametric method difficult to adapt to variable structure design, a new parametric method (AFV) for varied structure designing has been presented.AFV technology can make full use of existing designing resources to complete design more quickly.The implementation of AFV technology is independent of structure and function of the template, which improves expandability and flexibility of the system.The method of constructing axle system mechanical model using UG 3D geometry (Curve and DatumAxis object) based on basic mechanics principles has been discussed.The load module is designed for this system, which consists of two main functions:defining loads and solving loads.Defining loads includes appling loads, adding contact loads, modifying loads, and adding balance equation.The system is divided into a set of objects by contact loads, and unknown loads are solved by balance equations of all objects.The axle strength visualization technology has been researched, and OpenGL has been choosed to achieve stereoscopic display in post-processing.Stereoscopic display is realized by polygon filling technology, which provides visual observation of axle strength for the user.The system is divided into three parts:preprocessing module, solution module and post-process module. Meshing and parametric modeling are implemented by preprocessing module, force apply and solution are completed by solution module, and post-process module displays the result by curve and nephogram. Accomplishing the whole process from structural design to strength check, the system is very practical to realize efficient and reliable design of rolling-stock axle.