一种支持多态特征转换的特征建模

在不同的工程应用中对特征有不同的定义方法。本文讨论了一种支持并行工程的特征建模方法，将一特征模型表示为三层：特征，正则形状，求解几何。在特征层定义了包括形状类型和有效约束的型特征，在正则形状层每一特征用参数化的实体表示，在求解几何层用一中心单元模型与各不同的工程应用相联系。不同的工程应用有各自不同的特征视角。本文的特征模型通过保持各视角的约束来保证其有效性。各视角的约束同存于造型系统中，用特征转换将变化在各视角间进行传播，从而保证各视角的一致性

A Feature Model Method Supporting Multiple Feature Conversion

Feature has different definition in different application,a feature modeling method surporting multiple feature transformation is discussed.A feature model is separated into three levels:feature,canonical shape and evaluated geometry.At feature level,a shape type and validation contrainsts are combined in a generic feature.At canonical level,a feature is represented by a parametization solid. At evaluated geometry level,a central cell model is linked to various applications.Various applications have different featrue views, the validation of the feature model is verified by maintaining the constraints in the different views,and feature conversion propagates changes among the various application views.