Abstract
A turbocharger for gasoline engines is exposed to low-cycle thermal field. It is important to prevent a turbocharger from low-cycle thermal fatigue fracture. In conventional design methods, engineers design it using their knowledge and doing trial and error procedures. However, it is difficult to design the optimal shape by trial and errors. In addition, it requires large amount of trials since a shape of turbocharger is complicated. In the present paper, we develop a new design frame work to reduce low-cycle thermal stress using a non-parametric shape optimization method that can automatically and freely modify surfaces. We then apply our new design frame work to an exhaust manifold of turbine housing integrated exhaust manifold.
