基于约束参数化的设计技术研究现状分析

系统分析了基于约束的参数化设计技术的研究现状。首先指出早期CAD系统初级参数化的主要缺陷；根据参数化设计方法在不同时期的主要特点，回顾了参数化设计的发展过程。参数化方法被划分为程序参数化、在线交互参数化和基于自组织方式的离线参数化。在在线交互参数化方法中，重点探讨了初等方法、变量几何法、人工智能法和构造过程法的原理和特点，并在人工智能法中介绍了基于知识的几何推量法、基于自由度分析的约束传播法和基于神经网络的自学习法；给出基于自组织方式离线参数化方法的主要步骤和特点。最后阐明了各种参数化方法存在的问题，以及该技术将来的发展方向。

The Analysis of Research Status for Based-Constraint Parametric Design

The analysis of research status for based-constraint parametric design is given. This article gives main limitations for early CAD system firstly, then reviews the development process of parametric design by main features in different phases. Parametric design methods are divided into program parametric design, on-line alternating parametric design and off-line parametric design. The principles and features are given for primary method, variational geometry method, artificial intelligence method and constructional process method, in the same time, some representative methods, such as geometry reasoning based on knowledge, constraint promulgation based on freedom analytical, are introduced in artificial intelligence method. Main processes and features for off-line parametric design are given. In the end, the article analyzes the current research situation, problems in different parametric methods and research direction in the future work.