Abstract Nowadays tendency is the practice of engine downsizing with a turbocharger, to increase fuel economy and decrease emissions. For both design and analysis, a reliable rotor-bearing model is mandatory. In turbochargers, floating-ring bearings support the rotating shaft, with a double-acting thrust bearing, to support axial force imbalances from the compressor and turbine gas flows. The typical turbocharger is highly nonlinear due to the high rotational speeds achieved. Therefore, a turbocharger model, supported by floating-ring and thrust bearings, is developed, considering both bearings nonlinear behaviour, including temperature variations in oil films. The thrust bearing model contemplates a full thermo-hydrodynamic evaluation, while the floating-ring bearing investigation is somewhat simplified. The analysis focuses on the thrust bearing influence in the turbocharger lateral vibrations.

中文翻译：

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推力轴承耦合对涡轮增压器横向动力学的影响

摘要 目前的趋势是采用涡轮增压器来缩小发动机尺寸，以提高燃油经济性并减少排放。对于设计和分析，可靠的转子轴承模型是必不可少的。在涡轮增压器中，浮动环轴承通过双作用推力轴承支撑旋转轴，以支撑来自压缩机和涡轮气流的轴向力不平衡。由于实现了高转速，典型的涡轮增压器是高度非线性的。因此，开发了一个由浮环轴承和推力轴承支撑的涡轮增压器模型，同时考虑了两种轴承的非线性行为，包括油膜中的温度变化。推力轴承模型考虑了完整的热流体力学评估，而浮动环轴承的研究稍微简化了。