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

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

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

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

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

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

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

Value-Driven Design Component Level Value Model Value Chart

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

Value-Driven Design Engine Inlet StatusGradient Value Efficiency90%150,000135,000 Weight ,000 Manufacturing Cost Maintenance Cost Reliability ,450 Design Value43,478 Maintainability ,652 Support Equipment Radar Cross-Section InfraRed Signature Module Design Value is Commensurate with System Design Value x = Partial Derivatives of the Objective Function Value Chart