Strategies for design reuse play a fundamental role in the development of products that change and evolve over time. Design changes often involve modifications in the geometry of parts and assemblies, which are driven by changes in the digital representation of the product, i.e. the procedural and parametric CAD model. Consequently, constraint redundancies in the two-dimensional profiles that build the parametric model can significantly hinder alterability and reusability. This paper argues that constraint redundancy conditions are not solely a computational problem but a more complex issue that involves the interaction with the sketch throughout the modeling process and the modeling scheme used to convey a specific design intent. We analyze a representative group of 3D MCAD systems and the interaction with their corresponding geometric kernels and Geometric Constraint Solvers (GCS) to determine how constraint redundancy is managed at the profile level. Next, we report the results of a series of experiments to evaluate the influence of redundant constraints on model editing and reusability tasks and describe the development of a new software tool for identifying and parsing constraint redundancy conditions. We conclude that constraint redundancy in profiles significantly and unnecessarily compromises model conciseness, robustness, and the overall model quality, which negatively affects user productivity and downstream processes. The implications of constraint redundancy conditions for CAD training are emphasized. Our experiments also demonstrate the value of our parsing tool to assist users in maximizing model reuse (by removing redundancies) and the communication of design intent (by proposing an optimal set of non-redundant constraints), but further development is necessary to use it as a practical tool for engineering analysis.

设计重用策略在随时间变化和发展的产品开发中起着基本作用。设计更改通常涉及零件和装配体几何形状的更改，这些更改由产品的数字表示形式（即过程和参数CAD模型）的更改来驱动。因此，建立参数模型的二维配置文件中的约束冗余会严重阻碍可更改性和可重用性。本文认为约束冗余条件不仅是一个计算问题，而且是一个更复杂的问题，涉及整个建模过程中与草图的交互以及用于传达特定设计意图的建模方案。我们分析了一组代表性的3D MCAD系统以及与它们相应的几何核和几何约束求解器（GCS）的相互作用，以确定如何在轮廓级别管理约束冗余。接下来，我们报告一系列实验的结果，以评估冗余约束对模型编辑和可重用性任务的影响，并描述用于识别和解析约束冗余条件的新软件工具的开发。我们得出的结论是，配置文件中的约束冗余会严重不必要地损害模型的简洁性，鲁棒性和整体模型质量，这会对用户的生产力和下游流程产生负面影响。强调了约束冗余条件对CAD训练的影响。