考虑浮环支承的涡轮增压器转子系统动力学行为研究

摘要

车用涡轮增压器作为一种高速旋转机械是由浮动轴承支承的。在高速高温工况下油膜的强非线性作用使转子系统在较大的转速范围内表现出复杂的动力学现象。本文利用双油膜短轴承模型结合涡轮增压器转子离散化模型进行建模和数值仿真，分别从浮环转速比、特征频谱、油膜偏心率三个方面比较分析来描述涡轮增压器全浮动轴承支承的转子系统的失稳特征。%As a kind of high-speed rotating machinery, vehicle turbocharger is supported on floating ring bearings. Under high speed and high temperature working conditions, the strongly nonlinear oil film force can make the rotor system complicated dynamic phenomena at a large speed range. A rotor dynamic model is established by using short bearing model of double oil films combined with the rotor discretization model of the turbocharger in this paper, the results of numerical simulation are described at the rotational speed rate of the floating ring relative to working speed, characteristic FFT spectrum and oil eccentricity respectively, and comparative analysis of such aspects to explain the double oil film instability characteristics of turbocharger rotor system supported on full floating bearings.