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首页> 外文会议>2001 ASME Design Engineering Technical Conferences and Computers and Information in Engineering Conference Vol.2: 27th Design Automation Conference, 2001, 2001 >SOLUTION SELECTORS: A USER-ORIENTED ANSWER TO THE GEOMETRIC CONSTRAINT MULTIPLE SOLUTION PROBLEM
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SOLUTION SELECTORS: A USER-ORIENTED ANSWER TO THE GEOMETRIC CONSTRAINT MULTIPLE SOLUTION PROBLEM

机译：解决方案选择者：针对几何约束的多重解决方案问题的用户导向型答案

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摘要

The development of solid modeling to represent the geometry of designed parts and the development of parametric modeling to control the size and shape have had significant impacts on the efficiency and speed of the design process. Designers now rely on parametric solid modeling, but surprisingly often are frustrated by a problem that unpredictably causes their sketches to become twisted and contorted. This problem, known as the "multiple solution problem" occurs because the dimensions and geometric constraints yield a set of non-linear equations with many roots. This situation occurs because the dimensioning and geometric constraint information given in a CAD model is not sufficient to unambiguously and flexibly specify which configuration the user desires. This paper first establishes that only explicit, independent solution selection declarations can provide a flexible mechanism that is sufficient for all situations of solution selection. The paper then describes the systematic derivation of a set of "solution selector" types by considering the occurrences of multiple solutions in combinations of mutually constrained geometric entities. The result is a set of eleven basic solution selector types and two derived types that incorporate topological information. In particular, one derived type "concave/convex" is user-oriented and thought to be very useful.
机译：代表建模零件几何形状的实体建模的发展和控制尺寸和形状的参数化建模的发展对设计过程的效率和速度产生了重大影响。设计师现在依赖于参数化实体建模，但是令人惊讶的是，常常令人惊讶的是，这个问题导致草图无法正确地扭曲和扭曲。因为尺寸和几何约束会产生一组具有许多根的非线性方程，所以会出现称为“多解问题”的问题。之所以会出现这种情况，是因为CAD模型中给出的尺寸和几何约束信息不足以明确，灵活地指定用户所需的配置。本文首先确定，只有明确，独立的解决方案选择声明才能提供一种灵活的机制，足以满足所有解决方案选择的情况。然后，本文通过考虑相互约束的几何实体的组合中多个解决方案的出现，描述了一组“解决方案选择器”类型的系统推导。结果是一组包含拓扑信息的11种基本解决方案选择器类型和2种派生类型。特别地，一种派生类型“凹/凸”是面向用户的，并且被认为非常有用。

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