特征模型参数范围的计算

提出一种通过计算特征模型拓扑结构改变时的参数值确定参数范围的方法．方法针对的特征模型由一个关联参数和特征几何信息的几何约束系统和一个细胞元模型组成．细胞元模型将欧几里德空间分成准分离单元——由特征几何体的相交确定．该方法创建一个新的几何约束系统来将模型参数和细胞元模型中的拓扑实体关联起来．对每个依赖于可变参数的实体，特定的几何约束会使它退化．对约束系统求解就能得到关键参数值，从而确定参数范围．

Parameter Range Computation for Feature Model

A method is presented to determine the parameter values for the topology changes of a feature model, i.e. the critical values of a given variant parameter. The considered feature model consists of a system of geometric constraints, relating parameters to feature geometry, and a cellular model. The cellular model partitions Euclidean space into quasi - disjoint cells, determined by the intersections of the feature geometry. The method creates a new system of geometric constraints to relate the parameters of the model to topological entities in the cellular model. For each entity that is dependent on the variant parameter, degenerate cases are enforced by specific geometric constraints. Solving this system of constraints can get the critical parameter values.