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- W4226514334 abstract "Since the Industrial Revolution (1760–1820), 2040 gigatonnes of carbon dioxide (CO2) were emitted to the atmosphere and the half of these emissions occurred between 1970 and 2010. Worldwide, greenhouse gas (GHG) emissions increased over 1970–2010, with larger absolute increases between 2000 and 2010 and 14% of this total amount was released due to transportation. Furthermore, 65% of GHG emissions are related to CO2 and, in order to mitigate its effect on global warming, stricter legislations lowered the CO2 emission limits for automobiles. To achieve these stricter emission limits, the strategy of engine downsizing with the use of a turbocharger has been adopted by the automotive industry. The turbocharger is characterized as a low weight and high-speed rotor, achieving rotational speeds as high as 350 krpm. To withstand these extremely high rotating speeds, the shaft is commonly supported by floating ring bearings, leading to complex rotor dynamic phenomena. This work summarizes the rotor dynamics of automotive turbochargers, presenting its expected, general behavior, along with a literature review on the most important topics regarding turbocharger dynamic analyses. The nonlinear effect of the floating ring bearing on the shaft lateral vibrations is discussed, along with the effect of different bearing systems on the turbocharger response, including the thrust bearing effect on the rotor axial and lateral dynamics. Current researches on turbocharger modelling and investigation are also presented. Most works rely on developing high fidelity models with low computational costs, including several different effects, such as temperature variations and mass-conserving cavitation algorithms in the lubricated bearings, investigations on newer geometries of the floating ring and thrust bearings and optimal solutions to reduce friction losses." @default.
- W4226514334 created "2022-05-05" @default.
- W4226514334 creator A5022446190 @default.
- W4226514334 creator A5073089947 @default.
- W4226514334 date "2022-01-01" @default.
- W4226514334 modified "2023-09-30" @default.
- W4226514334 title "A Review on the Rotor Dynamics of Automotive Turbochargers" @default.
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- W4226514334 doi "https://doi.org/10.1007/978-3-030-91869-9_4" @default.
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