不同油膜力模型下转子椭圆轴承系统的动力学分析

1引言滑动轴承的非线性油膜力模型是转子-轴承系统非线性动力学分析和研究的关键问题。滑动轴承的油膜力具有强烈的非线性特性,研究转子-椭圆轴承系统的非线性动力学问题关键在于获得椭圆轴承的油膜力模型。其中椭圆轴承的非线性油膜力的计算精度和计算速度将直接影响到转子-轴

A Dynamic Analysis of a Rotor Elliptic-bearing System Using Different Oil-film Force Models

The nonlinear oil-film force obtained by using several kinds of elliptic-bearing nonlinear oil-film models currently available is analyzed and compared with that derived by directly using a finite-difference numerical method for solving a Reynold equation.Meanwhile,the relative errors,calculation speed and dynamic characteristics of the response of an actual rotor-elliptic bearing system obtained under different elliptic-bearing non-linear oil-film force models have also been analyzed and compared.With the calculation accuracy,computation speed and dynamic characteristics of the above system being taken into account in a comprehensive way,research results show that a database method should be an oil-film force model to be recommended as a first priority,followed by a database fitting-expression and variation method model as a second choice.The foregoing provides a basis for the selection of oil-film force model during the nonlinear dynamic analysis and design of an actual rotating mechanical rotor-elliptic bearing system.