In Practice... MDO Uses (0) Step through(1)-(8) The 'MD'portion of 'MDO'is important on its own (ii)The optimizer will use an error in the problem setup to Often MDO is used not to find the truly optimal determine a mathematically valid but physically design,but rather to find an improved design.or even unreasonable solution a feasible design... OR The optimizer will be unable to find a feasible solution (satisfies all constraints) Range of design objectives (iii)Add,remove or modify constraints and/or design variables (iv)Iterate until an appropriate model is obtained Although MDO is an automated formalization of the design Feasible Improved Optimal Pareto process,it is a highly interactive procedure... System Engineering by J.J.Gao ③cLao 国 29 System Engineering by J.J.Gao ③cLco 30 Today's Agenda Fidelity/expense of disciplinary models: Fidelity is often sacrificed to obtain models with short computation times. Complexity: ■MDO definition Design variables,constraints and model interfaces must be managed carefully. Optimization problem 。Communication formulation The user interface is often very unfriendly and it can be difficult to change problem parameters. MDO in the design process 。Flexibility ■MDO challenges .It is easy for an MDO tool to become very specialized and only valid for one particular problem. How do we prevent MDO codes from becoming complex,highly specialized tools which are used by a single person (often the developer!)for a single problem? System Engineering by J.J.Gao ③ctGe 31 System Engineering by J.J.Gao ③c1Ge 32+ - System Engineering by J. J. Gao 29 In Practice... + - System Engineering by J. J. Gao 30 MDO Uses + - 31 Today䇻s Agenda System Engineering by J. J. Gao MDO definition Optimization problem formulation MDO in the design process MDO challenges + - Fidelity/expense of disciplinary models: Fidelity is often sacrificed to obtain models with short computation times. Complexity: Design variables, constraints and model interfaces must be managed carefully. Communication The user interface is often very unfriendly and it can be difficult to change problem parameters. Flexibility It is easy for an MDO tool to become very specialized and only valid for one particular problem. System Engineering by J. J. Gao 32 How do we prevent MDO codes from becoming complex, highly specialized tools which are used by a single person (often the developer!) for a single problem?