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《Power Engineering》 2004-03
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Nonlinear Vibration Analysis of a Low-Pressure Rotor-Bearing System for 200MW Steam Turbine

LIU Zhan-sheng~1,CUIYing~1,LENG Shu-xiang~2,HAN Wan-jin~1,HUANG Wen-hu~2(1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2. School of Astronautics, Harbin Institute of Technology, Harbin 150001, China)  
The nonlinear dynamical characteristics of a actual large-scale rotor-bearing system is firstly investigated by using numerical simulating method, and the computational results accord with the operating experiences. The nonlinear differential equation that govern the motion of a low-pressure rotor-beariong of 200MW turbine unit is presented using the FEM, and the Newmark method is applied to simulate the vibration responses of the rotor in the processes of increasing and decreasing rotational speed. It is obtained the instability threshold speeds of the system and the phenomenon "inertial sluggish" of the oil whip. The effect of the eccentricity and gravity of rotor on the oil whirl and oil whip is analyzed. The numerical results reveal the changing rule of the amplitude with the eccentricity of rotor, the clearance-to-radius ratio, the length-to-diameter ratio and oil viscosity of bearing. Figs 15, table 1 and refs 7.
【Fund】: 国家自然科学基金重大项目(编号19990510)
【CateGory Index】: TK263.61
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