Study on the Loading Capacity of An Electrorheological Squeeze Film Damper with Rotating Circular Plate Electrode

• Main Authors: Hong-Chi Nian, 粘鴻祺
• Other Authors: Chun-Ying Lee
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/29675310544499639022

碩士 === 大葉大學 === 機械工程學系碩士班 === 91 === ABSTRACT It is known that the electrorheogical (ER) fluid demonstrates better ER effect in the squeeze mode operation than in shear or flow modes. Hence, this thesis concentrates on the application of the ER fluid contained between rotating circular disks and operated in squeeze mode. When the axial loading or rotating speed of the disks has changed, the torque and axial loading capacity of this ER film damper can be controlled by adjusting the applied electric field. The result of this study can apply to the related research in the smart thrust bearing and transmission clutch. In the theoretical formulation, based on linear assumption, the rotating behavior and the squeezing dynamics of the ER fluid between two circular disks are uncoupled from each other. Therefore, the axial loading capacity and the rotation torque of the circular disks under different rotation speeds, amplitudes and fre- quencies of axial displacement are derived. The loading character- istics of this rotating ER squeeze film damper are also measured using an experimental test rig setup in this study. The measurements in axial loading capacity and rotating torque of the ER squeeze film damper under various operation circumstances verify the accuracy of the theoretical formulation. In addition, the modification on the surface morphology of the rotating electrodes can alter the local distribution of the electric field between them. These could make the suspension particles in the ER fluid aggregate into thicker chain-like structure upon the application of electric field. Thereby the ER effect can be enhanced. Accordingly, three circular electrodes with different surface morphology are studied experimentally. The result suggests the modification on the electrode surface can provide a feasible method for improving the ER effect on this rotating squeeze film damper. It is expected that the results of this study can be applied to the related field in the design of the ER smart bearings. Keywords: electrorheological fluid, squeeze mode, thrust bearing, smart bearing.