Research Of Parametric Design Theory

Parametric design is an important aspect of CAD field, with this method, the product can be design quickly and efficiently, so, it is necessary to do some research of the theory of parametric design. There .are many aspects in CAD that need to be enhanced, this paper presents some new methods and theories, which were realized with programming language. The result of programme shows these methods are efficient.This paper presents new optimum design method in CAD, the examples in this paper show this method is efficient. During design procedure, under-constrained problem is met usually, for each type of under-constrained problem, this paper generalizes associated solution method, which can be used in CAD programming.This paper presents a new method of sparse matrix decompose which is based on the concept of matched degree, this method can make the process much simple and can be used in the decomposition of the construct matrix with multiple-freedom variables and constraints.This paper presents partial-variable iteration method to solve recurrent-constraints. During the process of calculation the number of the iterated variables is decreased, which increases the stability of the process of calculation.This paper presents the method of curve deform which is based on the concept of the energy of deform curve. The method has many uses, such as the design of industry shaping and the parametric deform of spline-curve.