Jeffcott转子-可倾瓦滑动轴承系统不平衡响应的非线性分析  

NONLINEAR ANALYSIS OF UNBALANCE RESPONSE FOR JEFFCOTT ROTOR-TILTING PAD BEARING SYSTEM

作　　者：焦映厚[1] 陈照波[1] 刘福利[1] 曲秀全[1] 张直明[2] 

机构地区：[1]哈尔滨工业大学机电学院,黑龙江省哈尔滨市150001 [2]上海大学机械工程系,上海市闸北区200072

出　　处：《中国电机工程学报》2004年第12期227-232,共6页Proceedings of the CSEE

基　　金：黑龙江省自然科学基金项目(E0220)黑龙江省自然科学基金重点项目(ZJG03-1)。

摘　　要：考虑了可倾瓦滑动轴承的非线性油膜力,对Jeffcott转子-可倾瓦轴承系统的不平衡响应进行了非线性分析。以非定常雷诺方程和雷诺破膜条件为依据,生成了单瓦非线性油膜力数据库。根据可倾瓦滑动轴承的结构特点,对单瓦数据库进行插值和拼装以获得可倾瓦滑动轴承的非线性油膜力的瞬时值。通过计算得到了不同参数下,Jeffcott转子-可倾瓦轴承系统的轴颈和转子的涡动轨迹及振幅。计算结果与线性动力学所得的结果进行比较。两者在不平衡量比较小的情况下结果吻合良好,但在不平衡量很大时结果却有较大差别。可见在进行转子-可倾瓦轴承系统的非线性动力学分析时有必要计入可倾瓦滑动轴承油膜非线性的影响。Unbalance response of Jeffcott rotor-tilting pad bearing system is analyzed with the nonlinearity of the bearing oil film forces considered. Based on the unsteady Reynolds equation and Reynolds boundary condition, a database of nonlinear oil film force for single pad is set up firstly. According to the structure characteristics of the tilting pad bearing, the instant values of nonlinear bearing fluid forces are got from the database through interpolation and summing up. By means of numerical integration, the whirl orbits and vibration amplitudes of the journal and rotor are obtained in cases of different speeds and unbalance. The results are compared with those by linear theory. It is seen that the difference is neglectable in cases of small unbalance, whereas significant in cases of large unbalance. It is necessary to consider the influence of the nonlinearity of fluid forces in tilting pad journal bearings when the dynamics performance of the rotor-tilting pad bearing system is analyzed.

关 键 词：滑动轴承 非线性油膜力 不平衡响应 可倾瓦轴承 涡动 转子 不平衡量 轴颈 非定常 

分 类 号：TM311[电气工程—电机] TH133[机械工程—机械制造及自动化]