高级检索

基于多维度视图的MBD模型检索算法

MBD Model Retrieval Algorithm Based on Multi-Dimensional Views

  • 摘要: 针对现有模型检索算法难以准确、高效地融合基于模型定义(model-based definition, MBD)的CAD模型的几何特征与语义特征, 导致MBD模型检索准确率不佳的问题, 提出一种基于多维度视图的MBD模型检索算法. 首先在语义层次上将制造语义特征基于状态位映射至纹理构建表面制造属性视图, 突破传统的形状描述符仅依赖几何特征的局限性; 然后在几何层次上结合表面深度视图和壁厚视图共同表达几何特征, 并将3类视图融合为多维度视图统一表达MBD模型复合特征; 再依据工程语义规则驱动的视图注意力机制实现模型的姿态一致性投影, 提高多维度视图表达的几何不变性; 最后基于ResNet和Transformer网络构建多层次、多粒度相似性评估策略, 通过双分支训练实现类别区分到实例辨识的特征学习, 提升不同检索意图下跨维度特征表达能力. 在纯几何CAD模型与MBD模型数据集上的实验结果表明, 所提算法在查全率、查准率等系列评价指标上均优于对比算法, 并能检索到更符合用户意图的MBD模型, 为零件系列化、标准化设计提供有力支撑.

     

    Abstract: To address the limitations of existing retrieval algorithms in accurately integrating the geometric and se-mantic features of CAD models expressed through model-based definition (MBD), resulting in inferior re-trieval accuracy, this paper proposes a retrieval algorithm based on multi-dimensional views. First, at the semantic level, engineering semantic features are mapped to texture based on state bits to construct surface manufacturing attribute views, breaking through the limitations of traditional shape descriptors that rely solely on geometric features. At the geometric level, surface depth views and wall thickness views are combined to jointly express geometric features, with three types of views fused into multi-dimensional views to represent the composite features of MBD models. Then, A view attention mechanism driven by engineering semantic rules is developed to achieve pose-consistent projection, improves the geometric in-variance of the multi-dimensional views. Finally, a multi-level, multi-granularity similarity evaluation strategy is constructed based on ResNet and Transformer networks, and dual-branch training is employed to achieve feature learning from category discrimination to instance identification, enhancing cross-dimensional feature representation capabilities under different retrieval intents. Experimental results on pure-geometry CAD and MBD datasets show that the proposed algorithm significantly outperforms comparison methods across evaluation metrics such as recall and precision, retrieves MBD models that better match user intent, and provides strong support for part serialization and standardized design.

     

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