Parametric curve modeling method of high degree of freedom

Abstract

The invention discloses a parametric curve modeling method of a high degree of freedom. The parametric curve modeling method comprises the following steps: 1) establishing a basic model curve, and setting the control parameter of the basic model curve for controlling the shape and the position of the curve; 2) establishing a function curve to control the change rule of the parameter of the basic model curve; 3) intercepting coordinates on a parameter control curve to generate the model curve of different positions; and 4) through a plurality of basic model curves of different positions and different shapes, forming a Nurbs curve. Through the method, when a complex curve is established, required manual design is little, and the generated curve has better controllability, higher deformation degree of freedom, flexibility in parameter setting and control, and high curve continuity and fairness quality.

Description

technical field [0001] The invention relates to the field of surface modeling, in particular to a high-degree-of-freedom parametric surface modeling method. Background technique [0002] In the current industrial field, with the improvement of product performance requirements, the complexity of product models is also getting higher and higher. Ordinary model modeling can no longer meet the performance requirements of products, and more and more complex surfaces are applied to product design. In, such as aircraft, automobiles, ships, fans, water pumps, etc. However, when these complex surfaces are widely used, they also bring various technical difficulties, such as the difficulty of modeling the surface and the difficulty of deformation control. Currently widely used 3D modeling software such as Pro-E and SolidWorks usually adopts the method of establishing curves in the form of points and then combining curves to obtain surfaces. However, these 3D modeling software requires...

AI Technical Summary

Problems solved by technology

[0002] In the current industrial field, with the improvement of product performance requirements, the complexity of product models is also getting higher and higher. Ordinary model modeling can no longer meet the performance requirements of products, and more and more complex surfaces are applied to product design. In, such as aircraft, automobiles, ships, fans, water pumps, etc.

However, when these complex surfaces are widely used, they also bring various technical problems, such as the difficulty of modeling the surface and the difficulty of deformation control.

Currently widely used 3D modeling software such as Pro-E and SolidWorks usually adopts the method of establishing curves in the form of points and then combining curves to obtain surfaces. However, these 3D modeling software requires a large amount of Point and line data, when controlling surface changes, controlling the shape of the surface can only be achieved by modifying the shape of the curves at different positions that make up the surface, which not only results in poor controllability of the surface, low degree of freedom of deformation, and the inability to accurately control the shape of any position on the surface ; and there are few parameter setting methods, it is impossible to give the changing law from one position to another on the surface, the parameters of each position can only be changed independently, and the smooth transition of the surface cannot be guaranteed when the parameters change

Therefore, the traditional three-dimensional modeling software needs to manually establish the profiles of multiple sections, and cannot simply control the parameter relationship between each profile, and cannot easily and conveniently adjust the surface after it is generated. When creating some complex surfaces, manually Increased design, resulting in increased labor costs