臺灣博碩士論文加值系統

同步輻射光在科技研究應用方面扮有相當重要的角色，研究人員可以藉由同步輻射光從事各種基礎與應用科學研究。在同步輻射光產生的過程中，需藉由高頻共振腔提供電子束能量。為確保光源品質，超導共振腔體可藉由沿軸向拉伸或壓縮來調整電磁場的共振頻率。在調整共振頻率的過程中，若過度壓縮，造價昂貴的腔體可能發生挫曲或塑性變形而無法繼續使用。本文以ANSYS軟體分析低溫超導共振腔在不同溫度、外部壓力及不同材料常數時的挫曲及變形行為。在實驗方面，使用一個和500 MHz共振腔幾何外形相似的1.5 GHz腔體模型進行實驗，觀察其變形行為及挫曲時的端面位移量，以驗證ANSYS的分析結果。分析結果顯示具彈性材料的共振腔體挫曲負載較彈塑性共振腔體高出許多；共振腔體的厚度越大、兩端的開口越大，挫曲負載值亦隨之增大；共振腔體額外承受一大氣壓的外壓力後，腔體的挫曲負載及變形行為並無明顯改變。本文之研究將有助於預測可容許的腔體調整範圍，並建立薄殼式共振腔的結構分析與設計能力。

頁次
摘要………………………………………………………………. i
誌謝………………………………………………………………… ii
目錄………………………………………………………………. iii
圖表目錄…………………………………………………………. v
第一章 簡介……………………………..………………………. 1
1.1 研究動機………………………...……………………..1
1.2 文獻回顧…………………………………………….....2
1.3 研究目標……………………...…………………………..5
第二章 有限單元模擬分析…………..…………………………. 7
2.1結構分析流程….………………...…………………….. 7
2.1.1 幾何模型建立………………...…...………………8
2.1.2 單元選取…………………………...…...…………9
2.1.3 有限單元網格之建立……..………………………10
2.1.4 邊界條件設定……………………………………….11
2.2 有限單元析……………………………………………...12
2.2.1 機械結構之有限單元分析………………………….12
2.2.2 牛頓-拉夫森法(Newton-Raphson Method)………17
2.2.3 弧長法(Arc-Length Method)………...…………17
2.2.2 特徵挫曲分析………...……………………………19
第三章 實驗程序……………………………………………………20
3.1 實驗設備…………………………………………………..20
3.2 材料常數量測………………………………………………20
3.3 試件尺寸……………………………………………………21
3.4 挫曲實驗……………………………………………………22
第四章 結果與討論…………………………………………………24
4.1 非完美尤拉柱的挫曲分析…………………………………24
4.2 圓柱殼受軸向負載的挫曲分析……………………………26
4.3 兩端管徑不同之圓柱殼受軸向負載之挫曲分析…………29
4.4 磷銅腔體之挫曲分析與實驗…………………………….30
4.5 500 MHz薄殼腔體受軸向壓縮位移之挫曲………………31
4.5.1 500 MHz薄殼腔體厚度改變之影響…………………34
4.5.2 500 MHz薄殼腔體溫度改變之影響…….…………36
4.5.3 500MHz薄殼腔體開口之影響……………..………37
4.6 1.5 GHz 薄殼腔體受軸向壓縮位移之挫曲分析…………38
4.6.1 1.5 GHz薄殼腔體厚度改變之影響…………………38
4.6.2 1.5 GHz薄殼腔體開口之影響…...………………38
4.6.3 內外壓力差對1.5 GHz 腔體挫曲的影響…………39
第五章 結論…………………………………………………….40
參考文獻………………………………………………………42
圖表………………………………………………………………45
附錄………………………………………………………………80
附錄圖表…………………………………………………………84

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