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A methodology for representation and reasoning in conceptual design: Application in creating an integrated design environment for stamped metal parts

机译：概念设计中表示和推理的方法：在创建冲压金属零件的集成设计环境中的应用

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摘要

This research proposes a new graph based representation methodology called Sketching Abstraction for representing preliminary designs with an emphasis on the conceptual design of components. In a sketching abstraction the functionally essential geometry of the part is represented using functional features along with a face representation while the nonessential geometry is abstracted using a linkage mechanism. The part functionality is correlated with the sketching abstraction using data structures called function-form matrices. The sketching abstraction is annotated with a set of primitives and a grammar is used to parse the annotations into pairwise canonical relationships between the essential geometry of the part.;The sketching abstraction and the functional signature of the part can be used for various reasoning activities such as extracting parts from a database that are functionally similar but whose geometry is different. We prove that such a search process can be carried out in polynomial time. We also show the link between a sketching abstraction and a solid model of the part. The application domain for this research is stamped metal parts manufactured by stamping dies.;This work presents a set of procedures to evaluate the manufacturability between two sketching abstractions. This includes checking for dimensional constraints, use of standardized tooling, accessibility of tooling for creating a feature and the estimation of costs for die construction. We also present a methodology to represent stamping dies at an early stage of design. Dies are represented using die sketches which are ordered collection of punch-die pairs that on application on a strip of metal result in the desired part design. A methodology is presented to create a die sketch from the sketching abstraction using a combination of domain dependent heuristic knowledge and geometric reasoning algorithms based on the dimensional and tolerance relationships between the key geometric entities in the sketching abstraction. We also present a set of algorithms for the estimation of lead times for die construction which is used to estimate the effect of design decisions on the overall product development lead time.;We also address the issue of organizing the design workflow during conceptual design using the sketching abstraction. We present the different collaborative tasks involved and suggest procedures for efficient utilization of design resources during conceptual design which may be utilized to develop a decision support system for conceptual design. (Abstract shortened by UMI.).
机译：这项研究提出了一种新的基于图形的表示方法，称为草绘抽象，用于表示初步设计，并着重于组件的概念设计。在草绘抽象中，使用功能特征和面部表示来表示零件的功能基本几何形状，而使用链接机制来抽象非必要几何形状。使用称为函数形式矩阵的数据结构，将零件功能与草图抽象相关联。草图抽象用一组原语进行批注，并且使用语法将注释解析为零件的基本几何形状之间成对的规范关系。从数据库中提取功能相似但几何形状不同的零件。我们证明了这样的搜索过程可以在多项式时间内进行。我们还展示了草图抽象和零件的实体模型之间的联系。这项研究的应用领域是通过冲压模具制造的冲压金属零件。这项工作提出了一套程序来评估两个草图抽象之间的可制造性。这包括检查尺寸约束，使用标准工具，用于创建特征的工具可访问性以及模具制造成本的估算。我们还提出了一种在设计的早期阶段代表冲压模具的方法。模具使用模具草图表示，模具草图是冲模对的有序集合，在金属条上应用后，可得到所需的零件设计。提出了一种方法，该方法可使用基于领域的启发式知识和几何推理算法相结合的，基于草图抽象的模具草图来创建模具草图，该算法基于草图抽象中关键几何实体之间的尺寸和公差关系。我们还提出了一套用于模具设计的交货时间估计的算法，该算法用于估计设计决策对整体产品开发交货时间的影响。;我们还解决了在概念设计过程中使用草绘抽象。我们介绍了所涉及的不同协作任务，并提出了在概念设计过程中有效利用设计资源的程序，这些程序可用于开发概念设计的决策支持系统。 （摘要由UMI缩短。）。

著录项

  • 作者

    Mukherjee, Amit.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Industrial engineering.;Mechanical engineering.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 342 p.
  • 总页数 342
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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