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博碩士論文 etd-0807110-154251 詳細資訊
Title page for etd-0807110-154251
論文名稱
Title
微渦流扇葉片結構強度之研究
A Study on the Impeller Strength of Mini Blower
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
98
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
2010-07-03
繳交日期
Date of Submission
2010-08-07
關鍵字
Keywords
有限元素法、微渦流扇、葉片、塑膠、潛變
impeller, creep, mini blower, finite element method, plastic
統計
Statistics
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中文摘要
微型直流塑膠風扇由於體積小、重量輕、扭力大、噪音低、易於安裝、易量產及客製化等優點,大量用於消費性電子產業。然而就塑膠材質風扇而言,最大的考驗就是高溫操作環境。微型直流風扇為了達到減重目的,設計上儘可能趨向輕薄,使扇葉在高轉速及高溫的條件下,極易衍生潛變問題,長期之異常潛變足以導致風扇卡死或其他失效,尤其是應用於車輛電子零組件之各型風散熱風扇,操作條件尤為嚴苛,潛變效應更不可忽視。本文乃期針對塑膠扇葉,探討在不同的工作溫度下,其溫度與轉速對扇葉應力分佈及潛變變形影響。
文中利用Marc有限元素套裝軟體,內建「熱-彈-潛」耦合模式,進行微扇葉之高溫運轉數值模擬,其結果並與PA66+GF30扇葉高溫運轉實驗結果比對。結果顯示兩者在變形的趨勢上有良好的一致性。文中亦針對兩種塑膠PET+GF30及PBT+GF30材質之扇葉進行分析與比較,結果顯示兩材質在高溫運轉下有不同的潛變效應,數據顯示PA66+GF30塑膠,明顯較適合於高溫轉轉。
Abstract
The interaction between the operating speed and the creep behavior of mini plastic fan has investigated in this study. The thermal-elastic-creep coupling model in Marc finite element method package are employed to simulate the stress distribution and creep deformation of a plastic fan operated in different operating temperature are simulated in this study. Results indicate that operating temperature affect the creep deformation significantly for a plastic fan or impeller. A comparison between the simulated data and measured data of PA66+ GF30 plastic fan was provided. A good agreement has been observed in this study. A comparison between the creep deformation of PET+GF30 and PBT+GF30 fan sets has also presented. Results indicate that PA66+GF30 plastic fan has a much better creep resistance a high temperature operating.
目次 Table of Contents
目錄 i
表目錄 iv
圖目錄 v
符號表 ix
摘要 xi
Abstract xii
第一章 緒論 1
1-1 微型直流風扇之應用及特色 1
1-2 目前國內微型直流風扇之發展 6
1-3 微型風扇的種類及用途 8
1-4 直流微型風扇的組成及發展 11
1-5 研究動機及方法 20
1-6 文獻回顧 21
1-7 論文架構 22
第二章 微型風扇設計與實驗方法 23
2-1 微型風扇的設計 23
2-1-1 馬達選用 24
2-1-2 軸承選用 27
2-1-3 系統需求 29
2-1-4 風扇性能曲線與測試 31
2-1-5 系統阻抗曲線與測試 32
2-1-6 系統與風扇的匹配 33
2-2 高溫運轉實驗 34
第三章 理論與數值分析 38
3-1 潛變效應 38
3-1-1 諾頓模式 39
3-2 塑膠材料 40
3-2-1 塑膠的種類及分子結構 41
3-2-2 常見的熱塑性工程塑膠 44
3-2-3 熱塑性塑膠變形機制 46
3-2-4 熱塑性塑膠的潛變 47
3-3 模型的建構 47
3-4 邊界條件的設定 51
3-5 材料參數 53
3-5-1 PET+GF30 54
3-5-2 PBT+GF30G6 55
3-5-3 PA66+GF30 56
3-5-4 馬達殼(SPCC) 57
第四章 結果與討論 59
4-1 分析結果 59
4-1-1 轉速的影響 59
4-1-2 溫度的影響 65
4-2 材料適用範圍 74
第五章 結論 79
5-1 結論 79
5-2 未來展望 80
參考文獻 81
參考文獻 References
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