1. Value-Driven Design Value-Driven Design A Review Paul Collopy January 10, 2006

2. Value-Driven Design VDD: A Review Optimization Extensive Attributes Constraints System Value Model Modular Hierarchy Component Level

3. Value-Driven Design Optimization Choosing the Best Attributes } Objective Function Value Alternatives Search among To find the best Value Model

4. Value-Driven Design Extensive Attributes Composition Function Performance, Cost, and -ilities System Attributes which are functions of Component Attributes

5. Value-Driven Design Constraints A Constraint is a Fence in the Design Space Constraints are either active or inactive –If a Constraint is active, it has blocked off the Best Design –Otherwise, a constraint is inactive and unnecessary Requirements < $30 M unit mfg cost < 30,000 lbs. weight Cost Weight (0,0) Best Cost Weight (0,0) Increasing Value Traditional Spec MethodValue-Driven Design Limit of Feasibility

6. Value-Driven Design System Value Model Objective function from System Design Usually non-linear, can be complex –Best if transparent and differentiable Describes system users or stakeholders rather than the system itself Models Preferences Economics is to Value Models as Physics is to Performance Models

7. Value-Driven Design Modular Hierarchy Turbine Design Turbine Blade Design Propulsion Control System Temperature Sensor Design FADEC Design Servovalve Design Wing Design Cockpit Design Avionics Systems Radar Design Heads-Up Display Design Landing Gear Systems Aircraft Systems Propulsion Systems If each component is optimized, the overall system will be optimized If you design the best components, you will realize the best system

8. Value-Driven Design Component Level Value Model Value Chart

9. Value-Driven Design Value Model Objective Function Linear Derived from the System Level Value Model by Differentiating the System Model      component i i k x i m k n k x x y y             * 11

10. Value-Driven Design Engine Inlet StatusGradient Value Efficiency90%150,000135,000 Weight700-130-91,000 Manufacturing Cost700-700 Maintenance Cost500-0.5-250 Reliability15002.33,450 Design Value43,478 Maintainability 7.8 -340-2,652 Support Equipment12-15-180 Radar Cross-Section0.1 -1200 -120 InfraRed Signature1.4-50-70 Module Design Value is Commensurate with System Design Value x = Partial Derivatives of the Objective Function Value Chart