非解析径向轴承支承转子系统非线性动力特性分析

• Published in: 上海大学学报（英文版） Vol. 10; no. 3; pp. 247 - 255
• Main Authors: 吕延军, 虞烈, 刘恒, 张永芳
• Format: Journal Article
• Language: Chinese
• Published: 西安交通大学%西北工业大学 2006
• Subjects: bifurcation; chaos; finite element method; nonlinear dynamics; stability; journal bearing-rotor system
• ISSN: 1007-6417

TH13; Nonlinear dynamic behaviors of a rotor dynamical system with finite hydrodynamic bearing supports were investigated.In order to increase the numerical accuracy and decrease computing costs, the isoparametric finite element method based on variational constraint approach is introduced because analytical bearing forces are not available.This method calculates the oil film forces and their Jacobians simultaneously while it can ensure that they have compatible accuracy.Nonlinear motion of the bearing-rotor system is caused by strong nonlinearity of oil film forces with respect to the displacements and velocities of the center of the rotor.A method consisting of a predictor-corrector mechanism and Newton-Raphson method is presented to calculate equilibrium position and critical speed corresponding to Hopf bifurcation point of the bearing-rotor system.Meanwhile the dynamic coefficients of bearing are obtained.The nonalyzed by the Floquet theory.Chaotic motion of long term dynamic behaviors of the system is an