转子-SFDB系统临界转速及稳定性的一种迭代解法

Damped Critical Speeds and Stability of a Flexible Rotor-SFDB-Support Structure System

本文研究装有挤压油膜阻尼器(SFDB)的转子-轴承-支承系统的临界转速计算及运动稳定性分析,探讨了不同的油膜阻尼器设计参数对转子系统临界转速及运动稳定性的影响。文章首先建立起考虑各种因素在内的转子系统的运动微分方程;然后通过复数运算,找出转子系统通过此非线性支承时的传递矩阵;进而用一种新的迭代方法计算转子系统的临界转速及稳定性边界。通过对以上振动特性进行分析,找到挤压油膜轴承-转子系统获得最佳设计时的参数范围。

Squeeze-Film Damper Bearing (SFDB) is quite often used in rotor-bearing system for controlling vibration and instability[1-5]. Perhaps because of the high nonlinearity of squeeze film force, many rotor-SFDB problems remain not thoroughly analysed. By computing the critical speeds and the vibration characteristics of a rotor system supported in SFDB, some researchers determined quantitatively values of bearing parameters B and clearance ratio C/ R to be used in order to reduce vibration of rotor system. But ...