摘要
以某船用燃气轮机低压转子-轴承系统为研究背景,考虑轴承非线性特性建立三支承双跨转子-轴承系统。并基于Lagrange运动方程和转子动力学理论建立系统动力学微分方程组,采用四阶Runge-Kutta法对方程组进行求解,分析了转速和径向游隙对系统非线性特性的影响。结果表明:在低转速时系统处于拟周期运动状态,随转速增大,系统运动状态演变为周期二、周期四和单周期运动,存在倍周期分岔现象;随3个轴承径向游隙同时增大,系统非线性特性更加复杂,系统表现为单周期、周期二和周期四运动;随右端支承轴承径向游隙增大,系统表现为单周期和周期二运动。
Taking low pressure rotor-bearing system for a marine gas turbine as research background,a tri-support double-span rotor-bearing system is established considering nonlinear characteristics of the bearings.The system dynamics differential equations are established based on Lagrange equation of motion and rotor dynamics theory.The fourth-order Runge-Kutta method is used to solve equations.The effects of rotational speed and radial clearance on nonlinear characteristics of the system are analyzed.The results show that the system is in quasi-periodic motion state under low speed.With the increase of rotational speed,the motion state of the system evolves into period two,period four and single-cycle motion,and there is a period-doubling bifurcation phenomenon.With the radial clearance of three bearings increases simultaneously,the nonlinear characteristics of the system are more complicated,the system behaves as single cycle,cycle two and cycle four motion.With the radial clearance of supported bearing at right end increases,the system exhibits single cycle and cycle two motion.
作者
李默
刘永葆
王强
LI Mo;LIU Yongbao;WANG Qiang(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China;College of Weapon Engineering,Naval University of Engineering,Wuhan 430033,China)
出处
《轴承》
北大核心
2019年第11期38-44,共7页
Bearing
关键词
滚动轴承
转子
径向游隙
非线性
动力学分析
rolling bearing
rotor
radial clearance
nonlinearity
dynamics analysis
