摘要：考虑发动机的基础激励和非线性油膜力，建立了涡轮增压器转子—轴承系统的动力学模型，研究了涡轮增压器转子在偏心质量作用下的非线性动力学行为。用数值计算方法对系统的动态响应进行了仿真计算，研究了转子随转速变化的分叉规律以及基础激励对转子非线性动力学行为的影响。结果表明，基础激励会通过非线性油膜力显著的影响转子的动力学行为，且基础激励会降低转子开始发生油膜涡动的转速，但基础激励对转子动力学的影响主要体现在转子转速较低的阶段。

Abstract: Considering the engine’s foundation excitation and nonlinear oil film force, the dynamic model of turbocharger rotor-bearing system is established, and the nonlinear dynamic behavior of eccentricity is investigated. The response is simulated by numerical calculation. The bifurcation disciplinarian of nonlinear rotor dynamics with different rotational speeds under foundation excitation is studied, and the influences of foundation excitation are evaluated. The result shows that foundation excitation will remarkably affect the rotor dynamic behaviors through the nonlinear oil film force, and foundation excitation will lower the rotational speed at which the oil whirl occurs. However, the influences of foundation excitation are more distinct on the low rotational speed stage of rotor than on the high speed stage.