Rotor dynamic design and stability study of marine electric-assisted turbocharger
The technology of electrically assisted turbocharger(EAT)is an important technical means to effectively solve the problems of insufficient air intake and poor transient response when the engine is started or accelerated in the tradi-tional turbocharger,and realize the electrification of the internal combustion engine power system.Based on the hydro-dynamic bearing lubrication theory and the rotor motion control equation,the dynamic finite element model of a turbochar-ger rotor system supported by floating ring bearings is established and the axial trajectory test is carried out.The nonlinear rotor dynamic characteristics of normal and unbalanced rotors of electrically assisted turbochargers with different bearing support forms are deeply studied by numerical calculation method.The results show that the rotor of the electrically assisted turbocharger has a wide range of subsynchronous vibration in a wide speed range,and its dynamic behavior is complex,and the rotor supported by floating ring bearings obviously has a higher subsynchronous vibration amplitude.Because the rota-tion of the floating ring is limited,the energy of the whirling vibration of the oil film is much less than that of the fundament-al frequency vibration,which shows a better damping effect and can well suppress the whirling/oscillation of the oil film.The research content of this paper can effectively assist the research work of electrically assisted turbocharger and improve its NVH performance.
万方数据
维普
