Faculty Early Career Development: Virtual Design and Virtual Prototyping for Near Net Shape Manufactured Parts

9501760 GADH这笔赠款为计算机辅助设计研究的职业奖项提供资金。它的目标是提供一个框架，用于在虚拟环境中创建形状设计，并在虚拟原型环境中进行可制造性分析和模具形状分析。这种方法的主要应用领域是使用注塑或压铸等工艺的接近净形状的制造零件。这项研究有三个重要组成部分。第一个重点是在虚拟环境中创造概念几何设计，第二个和第三个重点是将下游分析带入虚拟设计阶段。该方法将使用一组非均匀的B-样条线来表示对象的曲面模型，使用基于能量的方法，该方法利用弹簧连接曲面的控制点，从而确保曲面的平滑修改。特征提取将根据称为循环的更高级别实体的链来定义。自动化模具设计将分两步进行。在第一步中，将确定零件相对于开模方向的方向。在第二步中，使用提取零件轮廓的差分深度过滤器的变体来提取分型线。虚拟设计允许设计师头脑中的概念通过自然的人类手势输入计算机。这一过程应该会加快设计时间，并使设计过程更加直观。

9501760 Gadh This grant provides funding for a Career award for research in computer aided design. Its goal is to provide a framework for creating shape designs in a virtual environment and analysis of manufacturability and die shape analysis in a virtual prototyping environment. The principal domain to which this approach is applied is near net-shape manufactured parts using processes such as injection molding or die casting. There are three significant components to this research. The first focuses on creation of concept geometric designs in a virtual environment, and the second and third focus on bringing downstream analysis upstream to the virtual design stage. The approach will be to use a set of non-uniform B-splines to represent the surface model of an object, using an energy based approach that utilizes springs connecting the control points of the surface, thus ensuring smooth modification of the surfaces. Feature extraction will be defined in terms of chains of higher level entities called loops. Automated die design will be performed in two steps. In the first step, the orientation of the part with respect to the die-open direction will be determined. In the second step, a parting line is extracted using a variation of the differential depth filter that extracts the silhouette of the part. Virtual design allows concepts that reside in the designer's mind to be input into a computer with natural human gestures. This procedure should speed design time and make the process of design more intuitive.