偏心量对涡轮增压器转子系统动力学特性的影响分析  

Effects of Eccentricity on Rotor Dynamics Characteristic of Turbocharger

作　　者：朱磊[1] 魏道高[1] 史伟[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《汽车工程学报》2013年第4期282-286,共5页Chinese Journal of Automotive Engineering

基　　金：国家自然科学基金资助项目(51050002);清华大学汽车安全与节能国家重点实验室开放基金(KF2007-05)

摘　　要：涡轮增压器转子轴承系统在高速运转下由于油膜力的影响会呈现复杂的非线性动力学现象。通过对某涡轮增压器双悬臂转子建立转子动力学数学模型并利用Matlab软件进行数值仿真分析,发现该转子在超过临界转速时会突然发生失稳,通过频谱分析还发现油膜涡动的频率略小于0.5倍工作转速和锁频现象。在小偏心下,转子系统在较小转速就会发生油膜失稳,增大偏心量会改善转子的运动稳定性。结果表明利用增大叶轮偏心量的方法可以抑制油膜失稳现象。Rich variety of nonlinear dynamics phenomena appear for the turbocharger rotor system at high speed due to the efl;ect of oil force. A mathematical model of turbocharger double overhung rotor dynamics was established and through numerical simulation by Matlab the sudden oil whirl was found when rotor speed was over the critical speed. The frequency of oil whirl is less than 0.5 times rotor speed and frequency- locking is seen from FFT spectrum. On the condition of small eccentricity, oil whirl occurs at low speed and the motion stability of the rotor is improved when the eccentricity increases. The result shows that increasing the eccentricity of impeller can effectively suppress the subsynchronous vibration of oil whirl.

关 键 词：涡轮增压器 双悬臂转子 油膜涡动 偏心 

分 类 号：U464.135[机械工程—车辆工程]