M SA Step 1-Starting Out 6899 E508 2 Methods to Select the Initial Design Vector I Select a random point (ie random design architecture)in the trade space Select a known point in the trade space(ie a design architecture which has already been studied/demonstrated Typically, a random Design Vector is used to begin the SA algorithm(Exception: Construction Problem with few known feasible solutions) After a good " solution(s) has been found, this can be used as the starting point for a new run of the sa algorithm to try and find an even better solution(assumption You have now found the most favorable portion of the trade space) Massachusetts Institute of Technology-Dr. Cyrus D Jilla& Prof. Olivier de Weck Engineering Systems Division and Dept of Aeronautics Astronautics
SA Step 1 – Starting Out SA Step 1 – Starting Out • 2 Methods to Select the Initial Design Vector Γi – Select a random point (ie. random design architecture) in the trade space – Select a known point in the trade space (ie. a design architecture which has already been studied/demonstrated) • Typically, a random Design Vector is used to begin the SA algorithm (Exception: Construction Problem with few known feasible solutions). • After a “good” solution(s) has been found, this can be used as the starting point for a new run of the SA algorithm to try and find an even better solution (Assumption: You have now found the most favorable portion of the trade space). © Massachusetts Institute of Technology – Dr. Cyrus D. Jilla & Prof. Olivier de Weck Engineering Systems Division and Dept. of Aeronautics & Astronautics 11
M esd SA Step 2 -Evaluate E()Using Your 6899 Simulation Model E508 Design Vector Orbit 1AU Interferometer Type SCl-1D Environment Aperture Number of Apertures Size of Apertures 4 m Configuration Spacecraft Operations Dynamics, Optics Control, Structures Bus/Payload Metrics Systems Total Cost $902M GINA Total of Images 1273 Cost/Image 709K O Massachusetts Institute of Technology-Dr. Cyrus D Jilla& Prof. Olivier de Weck Engineering Systems Division and Dept of Aeronautics& Astronautics
SA Step 2 - SA Step 2 - Evaluate Evaluate E(Γ) Using Your ) Using Your i Simulation Model Simulation Model Design Vector Operations Systems GINA Spacecraft Bus/Payload Aperture Configuration Environment Dynamics, Optics, Control, & Structures Metrics Orbit 1 AU Interferometer Type SCI-1D Number of Apertures 4 Size of Apertures 4 m Total Cost $902M Total # of Images 1273 Cost/Image $709K © Massachusetts Institute of Technology – Dr. Cyrus D. Jilla & Prof. Olivier de Weck Engineering Systems Division and Dept. of Aeronautics & Astronautics 12