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博碩士論文 etd-0903103-103447 詳細資訊
Title page for etd-0903103-103447
論文名稱
Title
T形管件液壓成形之自適性模擬
Adaptive simulation for Tee-shape tube hydroforming processes
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
89
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2003-06-27
繳交日期
Date of Submission
2003-09-03
關鍵字
Keywords
自適性模擬、模糊控制器、管材液壓成形法、有限元素法
tube hydroforming, fuzzy logic controller, finite element method, adaptive simulation
統計
Statistics
本論文已被瀏覽 5671 次,被下載 4331
The thesis/dissertation has been browsed 5671 times, has been downloaded 4331 times.
中文摘要
管材液壓成形技術已廣泛地被應用於輕量化且高強度零組件之製造,在成形過程中所施予的負載路徑:內壓力對時間與軸向進給量對時間之關係,對於成形的結果有著相當大的影響,而有限元素法則常被用來模擬不同負載路徑下之成形結果,以降低實際試模所需的花費。本文以T形管件之液壓成形為研究的對象,以有限元素法套裝軟體LS-DYNA結合模糊控制器之副程式來進行自適性模擬。在管材液壓成形過程的模擬中,副程式能根據管材模頂處節點之厚度及厚度變化率的不同程度,來給予主程式每一階段所需的軸向進給量,藉由自動調適負載路徑來達到較佳支管厚度分佈的控制目標,經與一般線性路徑之模擬結果相比,亦證實此法有其優越性。在實驗的部分,經由與T形管件液壓實驗之比較,證實了LS-DYNA軟體對於成形結果之預測具有相當程度的準確度,而本法所得到之負載路徑之實驗結果亦優於一般線性負載路徑所得到之結果。
Abstract
The tube hydroforming (THF) technology has been widely used in manufacturing the lightweight and high strength components. The success of THF is largely dependent on the selection of the loading paths: internal pressure vs. time and axial feeding vs. time. The Finite element method is used to simulate the forming result of different loading paths and reduce the cost of die-testing. T-shape tube hydroforming is investigated adaptive simulation by combining FEM code LS-DYNA with fuzzy logic controller subroutine is proposed. During the simulation process, subroutines can adjust the loading paths according to the values of the minimum tube thickness and its variance. Then, the purpose of better thickness distribution of the formed tube at the side branch is achieved. Comparing with other linear loading paths, this adaptive control method got better results. In experiments, the validity of LS-DYNA applied in THF process is verified and the experimental results by adaptive simulation are better than those by the linear loading paths.
目次 Table of Contents
摘要 I
Abstract II
目錄 III
圖目錄 VI
表目錄 X
第一章 緒論 1
1-1 前言 1
1-2 管材液壓成形技術簡介 2
1-3 文獻回顧 5
1-4 研究動機與方法 7
第二章 有限元素模擬簡介 9
2-1 LS-DYNA有限元素軟體簡介 10
2-2 模擬模型之建構 12
2-2-1 假設條件 12
2-2-2 建立幾何模型 13
2-2-3 材料性質 14
2-2-4 網格分割 15
2-2-5 邊界條件 15
2-3 控制副程式 16
2-3-1 I/O模組 18
2-3-2 運算模組 23
2-3-3 操作連結 23
第三章 模糊控制理論簡介 25
3-1 模糊控制系統 26
3-2 模糊集合與歸屬函數 29
3-3 簡易模糊推論法 31
3-4 模糊控制設定 35
3-4-1 輸入歸屬函數 35
3-4-2 輸入歸屬函數 37
3-4-3 規則庫 38
第四章 模擬結果與討論 41
4-1 單階段控制策略 41
4-2 多階段控制策略 44
4-3 與線性控制策略之比較 48
第五章 T形管件液壓成形實驗 50
5-1 實驗目的 50
5-2 實驗設備 50
5-3 實驗結果 51
5-3-1 有限元素模擬與實驗值之比較 53
5-3-2 線性路徑與自適性控制路徑之實驗值比較 59
第六章 結論 66
6-1 研究成果之概要 66
6-2 今後研究之課題 67
參考文獻 68
附錄A 隱性與顯性有限元素法簡介 71
附錄B LS-DYNA分析輸入檔 73
附錄C 實驗管材之厚度分佈情況 76

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