The rotor dynamic analysis and optimization in turbocharger

In this paper the rotor dynamic characters of the bearing system in turbocharger are researched. The computing method of rotor dynamic is also analyzed. Through modeling the components and parts of bearing system and rotor dynamic model, the three critical speeds are computed and analyzed. By comparing the working speed and critical speed, we can judge that whether the turbocharger works nearby the critical speed or not. If it does, then how to make the turbocharger work stably is also researched. At the same time, how the key design parameters, such as the shaft length and diameter, impact on rotor dynamic character is discussed in detail. In the end, an optimization strategy of the rotor structure is proposed to make the working speed be away from the critical speed.