Directionally controllable squeeze film damper using liquid crystal |
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Authors: | Young-Kong Ahn Shin Morishita Bo-Suk Yang |
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Affiliation: | (1) Department of Mechanical Engineering, Yokohama National University, 156 Tokowadai, Hodogaya-ka, 240 Yokohama, Japan;(2) School of Mechanical & Automotive Engineering, Pukyong National University, 599 Daeyon-dong, Nam-ku, 608-737 Pusan, Korea |
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Abstract: | Liquid crystals (LC) are characterized by its phase, which appears as an intermediate state between crystalline solid and
isotropic liquid. This intermediate, phase is caused by orientation of molecules, and it can be controlled by an externally
applied electric or magnetic field. Subjected to an electric field, the viscosity of the LC varies according to the applied
electric field strength, which is called the electroviscous effect. This paper describes an application study of the electroviscous
effect of a LC to a controllable squeeze film damper (SFD) for a rotating machine. A prototype controllable SFD using a LC
was constructed and its performance was studied. It should be noted that the present SFD can produce anisotropic damping force
for a flexible rotor at the supporting position, which enables us to stabilize a flexible rotor in a wide range of its rotating
speed. |
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Keywords: | Squeeze Film Damper Liquid Crystal Electro-Rheological Fluid (ER Fluid) ER Effect Directional Damping Electric Field Flexible Rotor |
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