For passenger vehicle turbochargers, which are one of the products offered by Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. (MHIET), variable geometry turbochargers (hereinafter referred to as VG turbochargers) are widely adopted as a technology for realizing both fuel efficiency and power output. A VG turbocharger controls the flow velocity of exhaust gas to the exhaust turbine blade to enhance the turbocharging effect. The nozzle mechanism, which controls the flow rate, consists of many components and operates in a high-temperature and non-lubricated environment. Accordingly, design in consideration of both function and reliability is difficult.
For the purpose of design that improves the reliability of this mechanism, we developed a dynamic behavior evaluation technology that can take into consideration interference and sliding resistance, in which the thermal deformation of components is added to the conventional MBD analysis technology considering elastic deformation and vibration response. This paper introduces an overview of the developed technology.
