The floating-ring bearing supported turbocharger rotor system generally reaches the speeds exceeding 100,000 rpm in high-temperature environment, but the risky sub-synchronous whirl, oscillation, bifurcation, and chaos probably appear due to its unsteady hydrodynamic forces with the high shear rate and low viscosity lubricant. From this perspective of coupling tribology and dynamics, the transient acting pressures at the thermal double fluid-film bearing are computed by employing the turbulent lubrication theory, then a numerical model for the whole rotor-bearing system based on the transfer matrix method is developed to investigate its nonlinear vibration behavior. The results show that an “interval region” characterized by the synchronous unbalance vibration is available to avoid fluid-induced instability of this system at different high-speed requirements.

浮环轴承支撑的涡轮增压器转子系统在高温环境下转速一般达到100,000 rpm以上，但由于其具有高剪切速率和低粘度润滑剂。从摩擦学和动力学耦合的角度出发，利用湍流润滑理论计算了热双流体膜轴承的瞬态作用压力，然后建立了基于传递矩阵法的整个转子轴承系统的数值模型研究其非线性振动行为。