Graphic Rendering And Parallel Computing For Design Software Of Aircraft Tire Structure

Aircraft tires are crucial to the safe takeoff and landing of an aircraft as they are the only part contacting with the ground.To break free from dependence on foreign technology and design high-performance tires independently,it is necessary to develop a finite element industrial software for aircraft tire structure design.This thesis focuses on the graphic rendering and parallel computing functions of aircraft tire structure design software.The main research works are described as follows.In Chapter 2,VTK visualization technology is studied comprehensively.Firstly,the architecture of VTK is studied in detail,including the composition and execution mechanism of visualization pipeline and rendering engine.Afterwards,the data structure of VTK is summarized systematically,including data objects and datasets as well as commonly used cell types and dataset types.Finally,VTK is successfully configured in aircraft tire structure design software.In Chapter 3,the graphic rendering functions of pre-processing module in aircraft tire structure design software are developed by using VTK graphics engine.Firstly,finite element meshes for commonly used 3D cells are rendered,and graphic display ability for second-order cells is optimized,then finite element meshes for multi-component aircraft tire as well as its2 D cross-section are rendered,and it is proved that the rendering efficiency of VTK and ABAQUS is almost the same.Afterwards,this Chapter draws loads and constraints for finite element model,and further implements fixed-pixel display technology.Finally,commonly used interactive functions are developed in pre-processing.In Chapter 4,fast solution functions of finite element method in aircraft tire structure design software are developed by using multi-core parallel computing with CPUs.Firstly,the first-order hexahedral cell is taken as an example to derive finite element expressions such as stiffness matrix.Afterwards,parallel computing methods in.NET framework and PARDISO parallel numerical computation library are studied to apply them into finite element solution processes.Finally,two examples with tens of thousands and millions of degrees of freedom are used respectively to verify the efficiency in parallel computing.In Chapter 5,the graphic rendering functions of post-processing module in aircraft tire structure design software are developed by using VTK graphics engine.Firstly,the color lookup table and scalar bar of finite element contour are constructed.Afterwards,this Chapter draws aircraft tire finite element contour by using lookup table and scalar bar.Finally,the displacement contour with adjustable deformation scaling factor and stress contour with adjustable average threshold are drawn,and other commonly used interactive functions for post-processing are developed.Finally,the thesis is summarized and prospected.