Dynamic Analysis of a Rotor System with Oil Film Bearing

• Main Authors: Jhang, Sheng-Sen, 張勝森
• Other Authors: Liu, D. S.
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/14721662530491422030

碩士 === 國立中正大學 === 機械工程學系暨研究所 === 100 === The focus of this paper is to study the dynamic behavior of rotating shaft with oil-film bearing, the excellent design of oil-film bearing can restrain obviously the amplitude of vibration with comprehensive researches, therefore, this paper use the curve intersection method to find the gap ratio of oil, and cites the force model of oil-film from scholar Li [22] to derive the oil force, then we employed the global assume mode method(GAMM) induce the equation of motion. This paper discuss the variable parameters of dynamic response of rotating system such as coefficient of oil-film(μ), oil clearance(c) and bearing stiffness at different rotating speed, the results show that the single-rotor of system product the phenomenon of bifurcation at 9000(rad/s) of rotating speed due to the coefficient of oil-film and oil clearance are 4*10^-6(N-s/m) and 1*10^-5(m), respectively. When coefficient of oil-film increase and oil clearance decrease, the rotating speed of the initial point of bifurcation decrease to 8500(rad/s), and thumping quality of amplitude of system enlarge 2.466*10^-3(m).