Abstract
In order to improve the design quality and benefit of the automobile gasoil mechanical turbocharger, the finite element analysis method is proposed in this paper. Through the analysis of the semi-floating bearing structure, rotor dynamic analysis of small vehicle gasoline engine turbocharger have been done, including the calculation and analysis of critical speed and unbalance response. From the results of fatigue analysis and influence of super high pressure by selecting parts of geometry size as the design variables, in terms of meeting certain intension and toughness demands, the frame volume is selected as objective variable, and by adopting zero rank approach, the structural optimization is developed to prolong fatigue life of the material.
