Abstract
Present work focuses on the use of electrorheological fluid (ERF) as a lubricant in the high speed turbocharger rotor supported on floating ring bearings. The rotor is analysed by finite element modelling with gyroscopic effects and bearing forces. The ERF contains one carrier fluid and active particles that react to external electric field, which induces a yield stress in the fluid increasing its viscosity. In order to control the rotor vibration amplitudes, the dynamic changes in the fluid viscosities at the inner and outer films of bearing are employed with external electric field. A case study of automotive turbocharger rotor is considered and the effect of semi-active control is illustrated on the dynamic response of the system.
Highlights
The turbocharger rotor basically consists of a turbine and compressor which are connected through a shaft supported on a journal bearing system
The vibration control of high speed rotor systems by considering electrorheological fluids are explained by the literature [17,18,19]
For dynamic analysis of the rotor system a convergence study is carried out to select the number of elements and it was found that eight elements configuration performing nicely
Summary
The turbocharger rotor basically consists of a turbine and compressor which are connected through a shaft supported on a journal bearing system. Several earlier works [1,2,3] explained the stability analysis of high speed turbocharger rotor supported on the full floating ring bearings system. Wang et al.[8] measured the rotor dynamic coefficients of a controllable floating ring bearings They obtain the controllability of the bearing by utilizing the magneto rheological fluid as lubricant along with the external magnetic field. Some earlier works [9,10,11] explained the vibration control studies on the rotor dynamics by using of different methods like active and passive vibration controls. The vibration control of high speed rotor systems by considering electrorheological fluids are explained by the literature [17,18,19]. The present work focus on the use of electrorheological fluid (FRF) as a lubricant in the high speed turbocharger floating ring bearings.
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