Mest 16888 ES077 Structural Optimization II. Integrated Structural Optimization I. Design Space Optimization o Massachusetts Institute of Technology-Dr Il Yong Kim
19 © Massachusetts Institute of Technology – Dr. Il Yong Kim I. Structural Optimization II. Integrated Structural Optimization III. Design Space Optimization
16888 Bd Integrated Structural Optimization EsD.77 ☆ Motivation 1. Shape optimization Small number of design variables Smooth definite results Topology remains unchanged(Cannot make holes in the design domain) 2. Topology optimization Extremely large number of design variables Non smooth indefinite results Intermediate"densities" between void and full material → unrealistic o Integrate shape optimization and topology optimization o Massachusetts Institute of Technology-Dr Il Yong Kim
20 © Massachusetts Institute of Technology – Dr. Il Yong Kim Integrated Structural Optimization Motivation 1. Shape optimization - Small number of design variables - Smooth definite results - Topology remains unchanged (Cannot make holes in the design domain) 2. Topology optimization - Extremely large number of design variables - Non smooth indefinite results - Intermediate “densities” between void and full material unrealistic Æ Integrate shape optimization and topology optimization
16888 d Integrated Structural Optimization I ESD. 77 On CAD-integrated structural topology and design optimization N. OIhoff, M P. Bensoe and J. Rasmussen (1991) Interactive CAD-based structural system for 2-D Topology optimization CAD Shape optimization Topology optimization: Homogenization method(HOMOPT) Shape optimization CAOS(Computer Aided Optimization of Shapes CAD Commercial CAD system AutoCAD The designer decides the initial shape for shape optimization interactively with the results of the topology optimization o Massachusetts Institute of Technology-Dr Il Yong Kim
21 © Massachusetts Institute of Technology – Dr. Il Yong Kim On CAD-integrated structural topology and design optimization - N. Olhoff, M. P. Bensoe and J. Rasmussen (1991) - Interactive CAD-based structural system for 2-D - Topology optimization CAD Shape optimization - Topology optimization : Homogenization method (HOMOPT) - Shape optimization : CAOS (Computer Aided Optimization of Shapes) - CAD : Commercial CAD system AutoCAD - The designer decides the initial shape for shape optimization interactively with the results of the topology optimization Integrated Structural Optimization I
16888 d Integrated Structural Optimization ESD. 77 o Integrated Topology and shape Optimization in Structural Design M. Bremicker, M. Chirehdast, N. Kikuch and P.Y. Papalambros, (1991) 3-phase design process PhaseI Generate information about the optimum topology Phase l Process and interpret the topology information Phase ll: Create a parametric model and apply standard optimization isos (Integrated Structural Optimization System -Image processing scheme instead of interactive scheme o Massachusetts Institute of Technology-Dr Il Yong Kim
23 © Massachusetts Institute of Technology – Dr. Il Yong Kim Integrated Topology and Shape Optimization in Structural Design -M. Bremicker, M. Chirehdast, N. Kikuch and P. Y. Papalambros, (1991) - 3-phase design process Phase I : Generate information about the optimum topology Phase II : Process and interpret the topology information Phase III : Create a parametric model and apply standard optimization - ISOS (Integrated Structural Optimization System) -Image processing scheme instead of interactive scheme Integrated Structural Optimization II