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| 基于优先表的工程约束求解算法研究 |
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刘晓平1,2, 何涛3, 黄永红3, 唐卫清3, 刘慎权3
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1.中国科学院等离子体物理研究所,合肥,230031;2.合肥工业大学计算机学院,合肥,230009;3.中国科学院计算技术研究所CAD开放研究实验室,100080
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| 摘要: |
| 文章分析了工程设计中约束问题的特点和规律，阐明了工程约束与几何约束在工程CAD领域中的表现形式，提出了符合工程特点的“多元约束图”的约束表示模型和约束传播层的设计思想．为了有效地结合设计领域的特点，文章还提出了具有工程特性的“基于优先表的改进算法”．基于此思想，多种启发式的工程经验可以被加入其中，使处理速度大为提高．该研究已应用于工厂钢结构的系统设计中，取得了良好的效果． |
| 关键词: 工程CAD 模型 约束 优化 启发式 优先表 |
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| 基金项目:本文研究得到国家自然科学基金资助. |
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| The Priority List Based Algorithm for Solving Engineering Constraints in CAD System |
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LIU Xiao-ping,HE Tao,HUANG Yong-hong,TANG Wei-qing,LIU Shen-quan
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| Abstract: |
| The authors review current research situation of engineering CAD, including engineering con-straints and geometry constraints, and analyze the denotation and characteristics of engineering design. Somerules and peculiarities of constraints in engineering design are analyzed. Engineering constraints representationmodel named as “Multilateral Elements Constraints Graph”, and the method based on the model constructs theone-way dependence relations between constraints variable are analyzed. In this way, some problems of constraints consistency and search space are solved well.To bridge the gap between the constraints solver and special engineering domain,an improving algorithm based on priority list is developed.Many heuristic rules and engineering experiences could be added to the list for the efficiency.These algorithms have been used in the CAD system of plant steed structure design. |
| Key words: Engineering CAD model constraint optimization heuristic priority-list |
