滑动轴承动力特性系数动态分析方法

Dynamic Analysis Method of Dynamic Character Coefficient of Hydrodynamic Journal Bearing

采用滑动轴承动力特性系数动态分析方法用以研究滑动轴承动力特性系数瞬态响应。分别采用有限元法与有限差分法分析转子瞬态响应与油膜流场压力分布;数值积分油膜压力关于扰动的偏微分项求解滑动轴承动力特性系数;在每个时刻采用学科间迭代方法实现转子响应分析与滑动轴承动力特性系数分析之间的耦合。以某型涡轮增压器转子系统为例,分别采用动态滑动轴承动力特性系数与定滑动轴承动力特性系数分析转子系统瞬态响应;讨论间隙宽度、轴承长度和润滑油粘度对动态滑动轴承动力特性系数的影响,并与文献中的结论进行比对,验证该方法的有效性。

Dynamic analysis method is proposed to study the transient response of the dynamic character coefficient of hydrodynamic journal bearing. The transient response of displacement and the prediction of oil film pressure are analyzed by using finite element method （FEM） and finite difference algorithm respectively. The dynamic characters are calculated by numerical integral algorithm. The coupling process of rotor dynamics analysis and the dynamic character coefficient of journal bearing is achieved by the interdisciplinary iteration at every step. The dynamic coefficient and static coefficient of turbocharger rotor system,for example,are analyzed respectively. The effects of gap width,bearing length and oil viscosity on the dynamic coefficient are studied. By the comparison between the results and the conclusions in the literature,the effectiveness of proposed method is verified.