中文摘要：

针对传统的基于“相似零件结构有相似工艺”准则的知识检索方法造成知识重用粒度大等缺点，提出一种基于三维工序模型序列演变过程的工艺相似性度量方法.首先利用具有仿射不变性的一组物理特征量，即形状描述元，表达三维工序模型几何形状的特征值；然后通过比较形状描述元的差异获取三维工序模型序列中发生几何变化的体素；再由发生几何变化的体素构建相邻两道工序模型之间几何变化的属性邻接图，并利用属性邻接图所构成的序列表达工序模型几何演变过程；最后通过度量属性邻接图序列之间的相似性实现工艺相似性度量方法，实例结果表明，该方法是有效的.

英文摘要：

A similarity measure method based on the geometry evolution sequence of three-dimensional process model is presented against the criterion that “similar parts structure have similar process” which would result in disadvantages such as big process knowledge granularity. First, we use a group of physical feature vectors which are affine-invariant, called shape descriptors, to express the feature value of the three-dimensional process model’s geometry; Then, the changed voxels in the process model sequence will be obtained through comparing the difference of the shape descriptors; Next, we build the attribute adjacency graphs of two adjacent process models’ geometry evolution by using the changed voxels and use the sequence of the attribute adjacency graph to express the geometry evolution process of the process model; Finally, a novel similarity measure method of machining process is achieved by comparing the sequence’s similarity of the attribute adjacency graph. The case results proved the validity of the method.