Abstract
Keywords:
Shape optimization, FEM, B-spline curve, Torque converter, Lock-up clutch
Abstract
A FEM-based efficient method has been developed for optimizing the shape of 2-D structures. The sequential linear programming and Simplex method are coupled with finite element analysis. A selected set of master nodes on the design boundaries are employed as design variables and assigned to move towards their normal directions. Every other node along the design boundary is grouped into the master nodes. By interpolating the repositioned master nodes, the Bspline curves are formed so that the rest of the mid-nodes efficiently settle down on the B-spline curves. The mesh smoothing scheme is also applied to the nodes on the design boundary to maintain most of the finite elements in good quality. Finally, a numerical implementation of optimum design of an automobile torque converter piston subjected to a hydraulic pressure load and centrifugal force is presented. The results give the optimal shape of the piston and shows that additional weight up to 13% may be saved after the shape optimization.