不同氣體負載下雙螺桿壓縮機動力響應及振動頻譜特徵之預測

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許博華(Po-Hua Hsu) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

不同氣體負載下雙螺桿壓縮機動力響應及振動頻譜特徵之預測
(Prediction of Dynamic Responses and Vibration Spectrum Characteristics for a Twin-screw Compressor under Different Gas-induced Loads)

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摘要(中)

雙螺桿壓縮機具有高效能與低噪音的特性，常用於許多需節能及高效率能源系統的產業。若能建立一模型可成功預測於循環氣體負載下雙螺桿壓縮機之動態響應，不但可藉其改善系統傳動特性，更可輕易變更螺桿轉子、軸承組及各種工作狀況，預先得知母轉子輸出轉速、轉頻、齒間受力及振動訊號等變化，提供業界有根據之設計參考。因此，本研究提出一種新穎方法建立螺桿轉子與軸承系統之多體動力學模型，其中不僅考慮壓縮機工作腔中循環氣壓施加於螺桿轉子上之變動軸向力、徑向力與變動力矩，亦考量隨轉子接觸曲率半徑變化之赫茲接觸剛度，藉由理論與實驗驗證噴油式雙螺桿壓縮機中螺桿轉子與軸承系統之多體模型動態響應。並於得證後，本文最後利用所建立之多體動力學模型分別探討內部工作腔循環氣壓過壓縮、振盪、50%負載、轉子軸偏位及受壓受熱效應後等九種狀況之動態特性，歸納、整理上述工況改變對母轉子輸出轉頻、齒間受力、振動訊號頻譜有何影響，並提供製造商初步診斷壓縮機噪音來源，給予合理建議以改進其壓縮機之動態特性。

摘要(英)

A Study of the Correlation between Geometric and Dynamic Properties of Twin Screw Compressor Rotors under Circulating Pressure Load. High performance and low noise are characteristics of twin screw compressors, and they are often used in many industries that require energy saving and high efficiency energy systems. Establishing a model that can successfully predict the dynamic responses of twin screw compressors under circulating pressure loads can improve the system’s rotational properties, and easily change various working components such as rotor screws, bearing components, gaining preliminary understanding of changes in rotational speed, rotation frequency, tooth load, and vibration signal in female rotors., substantial design parameters for the industry can then be provided. Therefore, this study proposes a new method to establish a multibody dynamics model for rotor screws and bearing systems. Variations in axial force, radial force and moment of force of circulating pressure on rotor screws within the compressor’s working chamber are investigated, Hertz contact stiffness of varying rotor contact on radius of curvature is also examined. Multibody dynamic responses of rotor screws and bearing systems within the oil-injected twin screw compressor are then examined through theory and examination. This study then uses the established multibody dynamics model to examine the internal working chamber’s nine dynamic properties, including excessive compression, vibration, half load, rotor axial deviation, and heat and pressure effects. These property changes are organized and concluded to inspect the effects on the female rotor’s rotational frequency output, tooth load, vibration signal frequency spectrum. The conclusions are provided as substantial suggestions for manufacturers to preliminarily investigate compressor noise source, and improving the dynamic properties of compressors.

關鍵字(中)

★ 雙螺桿壓縮機
★ 多體動力學
★ 循環氣體負載
★ 赫茲接觸剛度
★ 動態響應

關鍵字(英)

★ Twin Screw Compressor
★ Multibody Dynamics
★ Circulating Pressure Load
★ Hertz Contact Stiffness
★ Dynamic Response

論文目次

摘要 I
ABSTRACT II
謝誌 IV
目錄 V
圖目錄 VIII
表目錄 XII
符號對照表 XIII
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 6
1-4 論文架構 7
第2章螺桿轉子理論接觸受力及氣體負載 9
2-1 螺桿轉子幾何參數定義及曲率半徑計算 9
2-2 轉子接觸特徵及受力理論 13
2-3 轉子表面所受循環氣體負載 18
2-3-1 螺桿轉子幾何特徵 18
2-3-2 循環氣體負載計算 20
2-4 本章結論 24
第3章雙螺桿壓縮機多體動力學模型之建立 25
3-1 螺桿轉子CAD模型建立 25
3-1-1 方法A：基於端面齒形沿軸線扭轉 27
3-1-2 方法B：基於端面齒形沿螺旋線掃出 28
3-1-3 方法C：基於幾何計算轉子軸向平面進行疊層拉伸 30
3-1-4 本節結論 31
3-2 雙螺桿壓縮機CAD模型簡化 32
3-2-1 本節結論 34
3-3 動載模擬軟體MSC.ADAMS介紹 35
3-3-1 模型匯入及網格設定 35
3-3-2 拘束對種類簡介 38
3-3-3 求解器的選用 39
第4章多體動力學模型之模擬分析及驗證 40
4-1 狀況1：螺桿轉子動力學模型與理論轉速、受力之驗證 41
4-1-1 動力學模型之建立方法 42
4-1-2 動載模擬分析結果 46
4-1-3 本節結論 48
4-2 狀況2：多體動力學模型與實驗量測之驗證 49
4-2-1 多體動力學模型之建立方法 49
4-2-2 實驗平台介紹及動載模擬結果 55
4-2-3 本節結論 59
第5章應用多體動力學模型預測壓縮機振動特性 60
5-1 狀況3-1：工作腔過壓縮壓力對轉子動載特性之影響 61
5-1-1 本節結論 66
5-2 狀況3-2：工作腔氣壓振盪對轉子動載特性之影響 67
5-2-1 本節結論 72
5-3 狀況3-3：工作腔半負載氣壓對轉子動載特性之影響 73
5-3-1 本節結論 78
5-4 狀況4：兩轉子軸偏位對多體動力學模型頻譜之影響 79
5-4-1 狀況4-1：公、母轉子軸向外軸偏移 79
5-4-2 狀況4-2：公、母轉子軸水平偏擺 81
5-4-3 狀況4-3：公、母轉子軸垂直偏擺 84
5-4-4 本節結論 86
5-5 狀況5：轉子受壓受熱變形對振動頻譜訊號造成之影響 87
5-5-1 本節結論 92
第6章總結與未來展望 93
6-1 總結 93
6-2 未來展望 95
參考文獻 96
作者介紹 99

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指導教授

吳育仁(Yu-Ren Wu)

審核日期

2016-7-27

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