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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题名:	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
作者:	陳仕賢;Chen, Shi-Xian
贡献者:	機械工程學系
关键词:	雙螺桿壓縮機;循環氣體負載;CFD;多體動力學;動態響應分析;Twin-screw compressor;gas-induced load;CFD;MBD;Dynamic response
日期:	2018-08-08
上传时间:	2018-08-31 15:03:53 (UTC+8)
出版者:	國立中央大學
摘要:	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。;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.
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