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系統識別號 U0026-2706202010212900
論文名稱(中文) 支承勁度對浮動式道床減振效能之影響
論文名稱(英文) The Influence of Bearing Stiffness on Reduction of Vibration of Floating Slab Track
校院名稱 成功大學
系所名稱(中) 土木工程學系
系所名稱(英) Department of Civil Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 李俊璋
研究生(英文) Chun-Chung Li
學號 N66074441
學位類別 碩士
語文別 中文
論文頁數 78頁
口試委員 指導教授-郭振銘
口試委員-余志鵬
口試委員-黃銘智
中文關鍵字 浮動式道床  橡膠老化  支承勁度  插入損失  減振效能 
英文關鍵字 Floating slab track (FST)  Robber aging  Bearing stiffness  Insertion loss  Reduction effect 
學科別分類
中文摘要 浮動式道床軌道系統中最重要的減振抗噪構件,係浮動式道床底下的彈性支承墊,通常採用天然橡膠、合成橡膠或者是金屬彈簧,彈性支承墊材料性質需要具備高使用壽年與高抵抗疲勞老化之特性。
若浮動式道床彈性支承墊採用天然或合成橡膠,於長時間營運下經過列車動態載重反覆加載,會造成橡膠發生疲勞老化之現象,支承墊垂向勁度將會隨之提高,進而影響到浮動式道床之減振效能。
本文將利用有限元素分析軟體Abaqus/CAE,依據桃園機場捷運延伸線浮動式道床軌道設計圖,建立三維浮動式道床有限元素分析模型,由文獻與現地試驗對模型進行驗證,再接著探討橡膠支承墊於不同疲勞老化程度的情況下,對於列車行經浮動式道床後減振效能的影響。
藉由分析模型所得之浮動式道床插入損失頻譜圖與其總體插入損失,可以得知隨著橡膠老化而支承勁度提升後,浮動式道床插入損失曲線有隨之上移的趨勢、總體插入損失也隨之減少,意即隨著橡膠老化支承勁度提升,浮動式道床減振效能也隨著降低,也會造成隧道仰拱面以及隧道土層接觸面之振動量隨之上升,影響環境振動之大小。
英文摘要 The most important component in the floating slab track (FST) system is the elastic bearing system, natural rubber, synthetic rubber or metal springs are usually used, and the material of the elastic bearing needs to have the characteristic of high service life and high resistance to fatigue and aging.
If the elastic bearing of the FST adopt natural or synthetic rubber, it will cause fatigue and aging of the rubber bearing under the repeated load of the dynamic train load during long-term operation. It will cause fatigue and aging of the rubber and the vertical stiffness of the rubber bearing will increase, which will affect the reduction effect of the FST.
In this research, the commercial finite element software Abaqus/CAE will be used to build a three-dimensional finite element model of the FST which is based on the design diagram of the extension line of the Taoyuan Airport MRT. The model will be verified by literature and the on-site hammer test. After verifying the FST model, the influence on reduction effect of the FST will be discussed under different circumstances of fatigue and aging of the rubber bearing when the train model pass through the FST.
By analyzing the insertion loss spectrum and the overall insertion loss of the FST, we see that the insertion loss spectrum curve of the FST has a trend to move upward and the overall insertion loss of the FST decrease as the rubber ages and the bearing stiffness increase. This means that as the rubber ages, the bearing stiffness increase, the reduction effect of the FST decrease, which will cause the vibration amount of the tunnel invert and the outside-surface increase and the environmental vibration will increase, too.
論文目次 目錄
摘要 I
EXTENDED ABSTRACT II
致謝 XII
目錄 XIV
圖目錄 XVI
表目錄 XIX
第1章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 文獻回顧 3
1.4 論文架構與研究流程 5
第2章 相關理論 8
2.1 .浮動式道床簡介 8
2.2 Abaqus/CAE簡介 13
2.3 衝擊錘原理 15
2.4 頻率響應函數 17
2.5 快速傅立葉轉換函數(FFT) 19
2.6 插入損失(Insertion Loss) 20
2.7 1/3八音倍頻(One-third Octave Band) 21
第3章 有限元素模型驗證 23
3.1 簡支梁有限元素模型 23
3.2 比較分析 27
3.3 比較結果 29
第4章 浮動式道床有限元素模型 31
4.1 模型建立與參數設定 31
4.1.1 軌道模型 31
4.1.2 隧道模型 37
4.1.3 列車模型 41
4.2 分析設定與邊界條件 43
4.3 模型驗證 46
4.3.1 實驗地點及流程 46
4.3.2 實驗設備介紹 50
4.3.3 初步分析 55
第5章 橡膠老化影響 57
5.1 時域反應 58
5.1.1 橡膠未老化 58
5.1.2 橡膠老化後 60
5.2 頻域反應 65
5.2.1 橡膠未老化 65
5.2.2 橡膠老化後 69
第6章 結論與建議 74
6.1 結論 74
6.2 建議 75
參考文獻 76
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