薄殼零件薄殼本體之結構化實體網格自動建構技術發展

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/84343

Title:	薄殼零件薄殼本體之結構化實體網格自動建構技術發展
Authors:	吳家瑋;Wu, Jia-Wei
Contributors:	機械工程學系
Keywords:	結構化實體網格;實體網格自動化;薄殼;特徵辨識;structured grid;automatic solid mesh;thin shell;feature recognition
Date:	2020-07-29
Issue Date:	2020-09-02 19:07:42 (UTC+8)
Publisher:	國立中央大學
Abstract:	模流分析(Mold flow analysis)為有限元素分析的一種，普遍應用於塑膠射出成型的產業中，隨著各產業對產品品質的要求提高，模流分析的精度要求也逐漸提高。其中，塑膠薄殼元件是射出成型當中常見的成品，因薄殼元件中包含許多凸起物等其它較為複雜支撐結構，所以目前大多以四面體網格建立，但此建構方式容易造成網格品質不良，若能將薄殼本體與凸起物分離，個別以手動進行六面體網格與三角柱網格建立，則可以改善網格品質，但是此兩種結構化網格的建立卻是非常耗時。因此本研究發展自動化搭建結構化實體網格的技術，針對薄殼元件之薄殼本體部份，探討如何使用特徵辨識資訊及Moldex3D Mesh基本網格建構模組，建立以六面體網格和三角柱網格為主的結構化實體網格。本研究會先掌握拓撲與幾何及特徵辨識資訊後，建立薄殼本體實體網格化所需要的資料與關聯，並產生高品質且結構規則的實體網格，未來可結合薄殼元件之凸起物網格建構資訊，發展更完整的薄殼元件自動化實體網格建構之演算法。;Mold flow analysis is a type of finite element analysis, and is commonly used in plastic injection molding industry. As the requirement for product quality is increased, so is the requirement for the precision of mold flow analysis. Thin-shell plastic parts exist in many products and are frequently manufactured by injection molding. Tetrahedral meshes are currently used for thin-shell parts that contain many protrusions and other more complex support structures. But this type of meshes usually results in poor quality in simulation. When protrusion features and thin-shell are separated from a thin-shell part, it could be easy to generate structured type of meshes (hexahedron and prism) manually. However, building up structured type of meshes is very time consuming. This study is aimed at the development of an automatic mesh generation method for the thin-shell of a thin-shell part. We investigate how to build structured meshes for a thin-shell, and applys Moldex3D Mesh module to develop the program for automatic mesh generation of hexahedral and prismatic meshes for a thin-shell. In this method, the topological, geometric and feature identification information is first recorded. The data and correlated information of solid meshes used for each region of the thin-shell is then evaluated. Finally, an algorithm high-quality structured meshes generation for the thin-shell is developed. The results of this study can be used to develop a more complete method for structured-type mesh generation of thin-shell parts by combining the meshing of protrusion features.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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