In recent years, with increasingly serious energy and environmental issues, emission regulations have become stricter worldwide. Due to this fact, turbocharged engines have become more common because of their high volume of power output, low consumption, and low emissions. However, the better performance comes at a price because turbochargers operate at high speeds, usually hundreds of thousands of revolutions per minute, and tend to be prone to fatigue and instability. For this reason, a turbocharger rotor has to be designed carefully with respect to its dynamic properties, which could be a very interesting task due to the high nonlinearity of the turbocharger’s behavior. Figure 1 shows the assembly diagram of turbocharger rotor-floating ring bearing. The structure of the turbocharger includes a turbine disk, compressor disk, floating ring bearing, and supercharger housing. When the turbocharger operates, the dynamic performance of the rotor, the lubrication characteristics of the floating ring bearing, and the instability of the oil film will have a significant impact on the working performance of the turbocharger, and they are also the main areas of concern for turbocharger performance development.

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基于热弹流润滑轴承模型和柔性多体动力学方法的高速汽油机涡轮增压器动态特性

近年来，随着能源和环境问题日益严峻，全球范围内的排放法规日趋严格。因此，涡轮增压发动机因其高功率输出、低消耗和低排放而变得更加普遍。然而，更好的性能是有代价的，因为涡轮增压器以高速运行，通常每分钟数十万转，并且往往容易疲劳和不稳定。因此，必须仔细设计涡轮增压器转子的动态特性，由于涡轮增压器行为的高度非线性，这可能是一项非常有趣的任务。图1图为涡轮增压器转子-浮环轴承装配图。涡轮增压器的结构包括涡轮盘、压气机盘、浮环轴承和增压器壳体。涡轮增压器工作时，转子的动态性能、浮环轴承的润滑特性以及油膜的不稳定都会对涡轮增压器的工作性能产生重大影响，也是人们关注的主要领域用于涡轮增压器性能开发。