旋转冲压转子-动静混合气体轴承系统振动特性仿真研究

张广辉;刘占生;田 新

振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 155-160.

PDF(1750 KB)
PDF(1750 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (9) : 155-160.
论文

旋转冲压转子-动静混合气体轴承系统振动特性仿真研究

  • 张广辉;刘占生;田 新
作者信息 +

Numerical study of vibration characteristics for rotating ramjet rotor-hybrid gas bearings system

  • Zhang Guang-hui;Liu Zhan-sheng;Tian Xin
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摘要

本文研究了旋转冲压压缩转子涡动时,在进气道压缩气流激力作用下的动静压混合气体轴承-柔性转子系统非线性动力学特性。首先对压缩进气道的内部流场进行分析,获得作用在转子上的非线性复杂激振力模型;同时采用有限单元法对旋转冲压发动机中动静压混合气体轴承转子系统(多自由度)进行建模,对含时间项的气体润滑雷诺方程与转子运动学方程进行耦合求解。通过动力学仿真获得了该系统在不同供气压力及不同偏心距作用下的轴心轨迹图与频谱图。研究结果表明,适当的选择供气压力与偏心距,可以降低旋转冲压压缩转子-动静混合气体轴承系统的振动幅值并提高其稳定性。

Abstract

The nonlinear dynamic characteristics of hybrid gas bearings-flexible rotors for rotating ramjet was studied where the inlet compressed flow forces were considered which were generated from the whirl of the rotor. Firstly the internal flow of compressed inlet flow was analyzed and the nonlinear complex forces model which acted on the rotor was obtained; the hybrid gas bearing-rotor system (multi-degree freedom) of rotating ramjet was modeled by employing the finite element method, and then this model was solved coupling with the gas lubricated Reynolds equation with time terms. The trajectory and frequency spectrum of the system for different supply pressure and eccentricities were obtained by the numerical simulation. The results indicated that if the supply pressures and eccentricities were chosen properly, the vibration amplitudes can be reduced and the stability would be improved.

关键词

旋转冲压 / 气体轴承 / 转子动力学

Key words

rotating ramjet / gas bearings / rotor-dynamics

引用本文

导出引用
张广辉;刘占生;田 新. 旋转冲压转子-动静混合气体轴承系统振动特性仿真研究 [J]. 振动与冲击, 2010, 29(9): 155-160
Zhang Guang-hui;Liu Zhan-sheng;Tian Xin. Numerical study of vibration characteristics for rotating ramjet rotor-hybrid gas bearings system [J]. Journal of Vibration and Shock, 2010, 29(9): 155-160

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