應用阻尼顆粒於旋轉機械之振動抑制及動平衡設計;Vibration Suppression and Dynamic Balance Design for Rotating Machines with Damping Particles

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Title:	應用阻尼顆粒於旋轉機械之振動抑制及動平衡設計;Vibration Suppression and Dynamic Balance Design for Rotating Machines with Damping Particles
Authors:	王譯徵;Wang, I-Cheng
Contributors:	機械工程學系
Keywords:	迴轉式壓縮機;動平衡設計;顆粒阻尼器;抑振;雙向耦合;rotary compressor;dynamic balance design;particle damper;vibration suppression;two-way coupling
Date:	2022-01-19
Issue Date:	2022-07-14 01:20:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究提出透過顆粒阻尼器(Particle Damper, PD)依工件動平衡狀況進行顆粒配置，以同時達到配重和抑制振動之雙重效果。首先透過多體動力學(Multi-Body Dynamics, MBD)建立迴轉式壓縮機模型，模型中考量循環氣體負載變化、支座與橡膠墊剛性與阻尼，並透過實驗驗證在轉動頻率下之振動之趨勢與量值，確認此模型之可靠性；未來利用此模型探討具PD之迴轉式壓縮機(新構型)之動平衡與抑振研究。新構型模擬時需同時應用離散元素法(Discrete Element Method, DEM)和MBD進行雙向耦合得到迴轉式壓縮機之動態模擬結果；首先針對迴轉式壓縮機進行轉子系統之動平衡驗證，在此動平衡驗證中不考慮氣體負載影響；迴轉式壓縮機依據ISO 1940動平衡等級需低於G 2.5，透過PD可使轉子系統動平衡等級達到G 0.31，確認其動平衡改善成效。然後針對新構型進行模擬並與原構型(頂配重塊)比較其抑振效果，確認新構型確實有抑振效果；也探討在不同顆粒粒徑、摩擦係數和恢復係數下，對迴轉式壓縮機系統抑振之影響；在不同顆粒半徑下皆對新構型有抑振效益，其中顆粒半徑1 mm較其他粒徑抑振效益較佳；隨顆粒摩擦係數增加，新構型系統之總動能越小，說明摩擦耗能越大，PD之抑振效果越佳；隨顆粒恢復係數增加，新構型之動能越大，說明碰撞耗能越小，PD之抑振效果越差。最後透過實驗驗證新構型之實際振動數值，徑向加速度平均可降低9.7%，切向加速度平均可降低2.46 %，確認PD之抑制振動效果。 ;In this study, a particle damper (PD) is proposed to configure particles according to the dynamic balance of the workpiece to achieve the dual effects of counterweight and vibration suppression at the same time. Firstly, the rotary compressor model is established through Multi-Body Dynamics (MBD), which considers the change of the circulating gas load, the stiffness, and the damping of the bearing and rubber. Experiments verify the trend and magnitude of vibration at the rotating frequency to confirm the reliability of the model. In the future, this model will be used to study the dynamic balance and vibration suppression of the rotary compressor with PD (new design). The discrete element method (DEM) and MBD are used for two-way coupling to obtain the dynamic simulation results of the rotary compressor with PD (new design). Firstly, the dynamic balance verification of the rotor system is carried out for the rotary compressor, and the influence of gas load is not considered. According to ISO 1940, the dynamic balance level of the rotary compressor needs to be lower than G 2.5. Through PD, the dynamic balance level of the rotor system can reach G 0.31. The new design is simulated and compared its vibration suppression effect with the original design (top weight) to confirm vibration suppression effect. The different particle sizes, friction coefficients, and restitution coefficients on the vibration suppression of rotary compressors were discussed. The new design has the vibration suppression effect under different particle radii, among which the particle radius of 1 mm is better than other particle diameters. With the increase of particle friction coefficient, the smaller the total kinetic energy of the new design, indicating that the more significant the friction energy consumption, the better the vibration suppression effect of PD. With the increase of particle restitution coefficient, the greater the kinetic energy of the new design, the smaller the collision energy consumption, and the worse the vibration suppression effect of PD. Finally, the actual vibration value of the new design is verified through experiments. The radial acceleration can be reduced by 9.7 % on average, and the tangential acceleration can be reduced by 2.46 % on average, confirming the vibration suppression effect of PD.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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