The Evaluation and Application of Part Search System

本研究利用CAD圖檔的外型與製造特徵，進行相似零件圖檔搜尋，並應用在產品管理系統中，使得具有類似外型與特徵的零件，可以共享彼此的設計製造資料。
利用零件圖檔的打光投影影像，進行Polar Fourier Transform（PFT）分析，得到描述此影像的Generic Fourier Descriptor（GFD）資料，以此進行圖檔外型的描述與比較；透過分析製造特徵與特徵辨識技術，可以取得圖檔的特徵種類與特徵輪廓。比較GFD與特徵資料，能夠判斷圖檔的相似性。此法則應用在產品管理系統中，可以搜尋資料庫中具有特定外型的零件圖檔，透過分析圖檔的外型與特徵變更，進行自動版本管理的工作。

Using the contents that CAD file provides, this research presents a method of searching parts with similar shape and manufacturing feature, identifying parts with similar shape and feature, in order to share their design and manufacturing data in PDM systems.
Polar Fourier Transform (PFT) analysis is applied to shadings image of a part to get its Generic Fourier Descriptor (GFD) indexes; feature recognition is applied for a part to get its manufacturing features. Using GFD index and feature information, it is possible to define the similarity of two parts. This approach can be applied to PDM systems for searching parts with certain shape and feature, and processed the automatic version control by analysis the shape and feature difference of different version parts.