Modal analysis of rotor on piecewise linear journal bearings under seismic excitation

被引:17
作者
Gaganis, BJ [1 ]
Zisimopoulos, AK [1 ]
Nikolakopoulos, PG [1 ]
Papadopoulos, CA [1 ]
机构
[1] Univ Patras, Dept Mech Engn, GR-26500 Patras, Greece
来源
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME | 1999年 / 121卷 / 02期
关键词
D O I
10.1115/1.2893963
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A rotor bearing system is espected to exhibit large vibration amplitudes when subjected to a large seismic excitation. It is possible that these vibrations can lean to large values the eccentricity of the bearings. Then the bearing is operated in highly nonlinear region because the stiffness and the damping coefficients are nonlinear as functions of the eccentricity. To solve this problem numerical integration must be performed with high cost in computer time. The idea of this paper was to divide the nonlinear area into more areas where the stiffness and damping coefficients could be considered to be constants. In other words the bearing coefficients are considered to be piecewise constant. The excitation due to the earthquake is modelled as a movement of the base of the bearings using the El Centro data for the acceleration. Then a simplified modal analysis for each of these piecewise linear regions can be performed. The equation of motion of the rotor contains rotational speed depended terms, known as gyroscopic terms, and terms due to base excitation. The response and the variation of the dynamic properties of this complicated rotor bearing system are investigated and presented.
引用
收藏
页码:190 / 196
页数:7
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