博碩士論文 105323026 詳細資訊




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姓名 陳仕賢(Shi-Xian Chen)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 不同工作條件下冷媒雙螺桿壓縮機之轉子受力分析及動載響應預測
(The Study of Dynamic Response Prediction and Analysis of Cyclic Loads on Rotors for a Twin-Screw Compressor under Different Working Conditions)
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摘要(中) 雙螺桿壓縮機為一種高效率、高穩定性、低噪音之流體機械,應用於冷凍空調、食品製造等多種產業,然而提升效能、改善振動情形仍為其技術發展之重要課題,本文提出一套數值分析方法,以螺桿轉子齒形離散點資料為基礎,結合熱力與流體力學計算得到之工作腔氣體壓力變動曲線,可快速計算不同齒型、不同工作條件下螺桿轉子所受之氣體衍生力及力矩、壓縮機運轉功率、軸承受力等結果,並將全載與部分負載之理論數值計算結果與CFD模擬結果比對驗證。前述計算所得螺桿轉子承受之氣體衍生變動力及力矩,後續施加於本研究所建立之雙螺桿壓縮機多體動力學(Multi-body Dynamics, MBD)分析模型,考量隨轉子接觸曲率半徑變化之赫茲接觸剛度及作用於轉子之循環氣體衍生負載對不同工作條件(100%全負載與75%、50%、25%部分負載等4種不同案例)下進行轉子接觸力、軸承受力與軸承加速度之時域及頻域分析,探討其動載響應之特徵並給予合理建議以改善其壓縮機之動態特性。
摘要(英) Twin-screw compressor is a fluid machinery with high efficiency, high stability and low noise used in refrigeration, air conditioning, food manufacturing and other industries. However, improving performance and reducing vibration is still an important issue for the development of compressor manufacturing industry. This thesis proposes a set of theoretical numerical analysis method to calculate gas-induced force and torque on rotors, operating power of motor and force on the bearings under different working conditions and rotor tooth types based on discrete points of rotor tooth and the pressure curve in working chamber that is calculated by thermodynamics and fluid dynamics quickly. The results calculated by theoretical numerical analysis method are then compared and verified by CFD (computational fluid dynamics) model. Importing cyclic gas-induced force and torque on rotors into MBD (multi-body dynamics) model considering Hertz contact stiffness of rotors and gas-induced load on rotors to analyze the contact force between rotors, force on bearings and acceleration of bearings under time and frequency domain for different working conditions (100%, 75%, 50% and 25% loading conditions), and investigating the characteristic of dynamic response of Twin-screw compressor and make reasonable suggestion to improve the vibration behavior of compressor.
關鍵字(中) ★ 雙螺桿壓縮機
★ 循環氣體負載
★ CFD
★ 多體動力學
★ 動態響應分析
關鍵字(英) ★ Twin-screw compressor
★ gas-induced load
★ CFD
★ MBD
★ Dynamic response
論文目次 摘要 i
ABSTRACT ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 x
符號說明 xi
第1章 緒論 1
1-1研究背景 1
1-2文獻回顧 4
1-3研究動機與目的 7
1-4論文架構 8
第2章 不同工作條件下螺桿轉子及軸承系統之負載計算及結果比較 9
2-1 雙螺桿壓縮機之結構及幾何 9
2-1-1 螺桿轉子—軸承系統及滑閥結構 9
2-1-2 幾何參數定義 14
2-1-3 轉子齒形與接觸線之離散點處理及計算 19
2-2 螺桿轉子—軸承系統之負載分析及計算 21
2-2-1 轉子間接觸力 22
2-2-2 循環氣體壓力衍生之轉子負載 23
2-2-3 軸承負載 31
2-3 理論數值計算與CFD模擬結果比較 38
2-3-1 不同工作條件下雙螺桿壓縮機CFD模擬 38
2-3-2 理論與模擬氣體衍生力矩與馬達運轉功率之比較 40
第3章 雙螺桿壓縮機多體動力學模型之建立 47
3-1多體動力學模擬軟體MSC.ADAMS介紹 47
3-1-1拘束對種類簡介 48
3-1-2求解器之選用 49
3-2雙螺桿壓縮機CAD模型建立 50
3-3轉子對與軸承系統之拘束條件與接觸參數設定 52
3-4 雙螺桿轉子之變動負載與動力參數設定 56
第4章 雙螺桿壓縮機之多體動力學模擬分析 62
4-1於過壓與仿真壓力曲線條件下轉子間變動接觸力比較 62
4-2 於理想與過壓壓力曲線條件下轉子間變動接觸力比較 73
4-3不同負載條件下母轉子排氣端軸承所受變動力分析 82
4-4不同負載條件下母轉子排氣端軸承加速度頻譜分析 85
第5章 總結與未來展望 92
5-1總結 92
5-2未來展望 94
參考文獻 95
作者介紹 98
參考文獻 [1] 邢子文,螺桿壓縮機-理論、設計及應用,北京機械工業出版社,2000。
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[8] S. Rane, A. Kovacevic, N. Stosic, “CFD Analysis of Oil Flooded Twin Screw Compressors,” International Compressor Engineering Conference, City University, Indiana, USA, No. 1023, 2016.
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[16] B.T. Wang, C.H. Hsieh, W.C. Wang, C.L. Liu, “Noise and Vibration Characteristic Studies of Twin Screw Compressor in Different Operation Conditions,” International Compressor Engineering Conference, Purdue University, West Lafayette, Paper, No. 2121, 2012.
[17] N. Stosic, E. Mujic, A. Kovacevic, I.K Smith, “The Influence of Discharge Ports on Rotor Contact in Screw Compressors,” International Compressor Engineering Conference, Purdue University, West Lafayette, Paper, No. 1809, 2006.
[18] Y.R. Wu, V.T. Tran,” Dynamic response prediction of a twin-screw compressor with gas-induced cyclic loads based on multi-body dynamics,” International Journal of Refrigeration, Vol. 65, 111-128, 2016.
指導教授 吳育仁(Yu-Ren Wu) 審核日期 2018-8-8
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