Packaging Geometric measures to check requirements Occupant model Inputs Shoulder room, knee room etc Roominess measure GM RD Trunk∨oume
14 4/14/04 Fenyes Packaging • Geometric measures to check requirements – Occupant model – Engine compartment packaging • Inputs – Occupant position - H-point, etc – Engine/transmission selection and position • Outputs – Shoulder room, knee room, etc – Roominess measure – Packaging feasibility 4/14/04 Fenyes Trunk Volume
Linear structures FE model associatively linked to UG parametric model - UG Scenario FE model is built once- automatically updated as geometry changes Beams/Springs/Shells/Masses Locations and properties associated to geometry (M, K. b, h, t, etc) Inputs Parametric geometry spe Component masses Initial structures model Outputs Vehicle mass Structural modes GM RD Tightly Coupling Representation to Analyses Analysis models remain synchronized with representation xample- CAD to CAE/structures: UG Modeling and UG Scenario Automatically update hybrid beam/spring/shell/mass model from CAD model Automatically update from CAD to CAE
15 4/14/04 Fenyes Linear Structures • FE model associatively linked to UG parametric model - UG Scenario – FE model is built once - automatically updated as geometry changes – Beams/Springs/Shells/Masses • Locations and properties associated to geometry (M, K, b, h, t, etc) • Inputs – Parametric geometry specification – Component masses – Initial structures model • Outputs – Vehicle mass – Structural modes 4/14/04 Fenyes Tightly Coupling Representation to Analyses • Analysis models remain synchronized with representation • Example – CAD to CAE/structures: UG Modeling and UG Scenario – Automatically update hybrid beam/spring/shell/mass model from CAD model Automatically update from CAD to CAE
Aerod Exterior aero surface linked to underlying structure CAD representation Aero drag is approximated Frontal area calculated in UG puts Outputs Frontal area GM RD Ener mpute fuel economy, acceleration based on spreadsheet model Depends on structures, marketing disciplines Frontal area Performance requirements Outputs Fuel economy (city, highway, combined)
16 4/14/04 Fenyes Aerodynamics • Exterior aero surface linked to underlying structure CAD representation – Aero drag is approximated – Frontal area calculated in UG • Inputs – Exterior shape • Outputs – Aero drag – Frontal area 4/14/04 Fenyes Energy • Compute fuel economy, acceleration based on spreadsheet model – Depends on structures, aero, marketing disciplines • Inputs – Cd – Drag – Frontal area – Powertrain, tires, etc. – Performance requirements • Outputs – Fuel economy • (city, highway, combined) – Acceleration
Business Estimate sales revenue costs Link performance to customer value Link customer value to sales/revenue Competitors Performance Forming and assembly technology Equipment, tooling costs BOM/Parts-size. mass. material Outputs Sales Revenue Net income, prof RD One Approach to Link Market Demand, Value, and Performance S-Model(Ref: H E. Cook, 1997) Customer-Perceived value Product Specifications Drive Drives market Demand Customer-Perceived value Increased Increased Improved Product spec Baseline value (e. g 0-60 Time, Turning Circle)
17 4/14/04 Fenyes Business • Estimate sales, revenue, costs – Link performance to customer value – Link customer value to sales/revenue • Inputs – Competitors – Performance – Forming and assembly technology – Equipment, tooling costs – BOM/Parts - size, mass, material • Outputs – Sales – Revenue – Cost – Net income, profit 4/14/04 Fenyes One Approach to Link Market Demand, Value, and Performance: S-Model (Ref: H. E. Cook, 1997) Customer-Perceived Value Drives Market Demand Price Sales Volume Baseline Value Competitive Advantage Increased Value Product Specifications Drive Customer-Perceived Value Product Value Product Spec Improved Function Increased Value (e.g. 0-60 Time, Turning Circle)
Example Problem Dimensional Flexibility for Vehicle Architecture atisfying performance requirements try, aero, fuel economy. packaging, business Body style Powertrain and components Nine high level, architectural design variables Vehicle width at rocker Front and rear track width+P Front and rear overhang Front and rear axe location- vertical and horizontal *N* Perturbed representation Computed change in Net Income(natural objective Generated sensitivities and optimized GM RD Example-Dimensional Flexibility Data Flow and Analysis esults (NASTRAN) (Excel) Aerodynamics Ene (SIGHT) Business
18 4/14/04 Fenyes Example Problem - Dimensional Flexibility for Vehicle Architecture • Maximize net income while satisfying performance requirements – Discipline analyses: geometry, aero, fuel economy. packaging, business – Discipline sub-optimization: structures, business • Specific vehicle configuration: – Body style – Powertrain and components • Nine high level, architectural design variables – Vehicle width at rocker – Front and rear track width – Front and rear overhang – Front and rear axle location – vertical and horizontal • Performed automated discipline analyses: – Perturbed representation – Generated analysis models – Exchanged data through database – Computed change in Net Income (“natural” objective) • Generated sensitivities and optimized Design Representation (Unigraphics) Database (MS Access) Multidisciplinary Design (iSIGHT) Structural Optimization (NASTRAN) Aerodynamics Interior Roominess (Excel) Business Summary of Results (Excel) Energy Custom Custom Custom 4/14/04 Fenyes Shoulder Room Design Representation (Unigraphics) Database (MS Access) Multidisciplinary Design (iSIGHT) Structural Optimization (NASTRAN) Aerodynamics Interior Roominess (Excel) Business Summary of Results (Excel) Vehicle Geometry Body Structure Mass Frontal Area, Cd Value of Roominess Optimized Gauges And Sections Architecture Configuration & Parameterization Net Income Exterior Width Gauges, Areas, Section Sizes Fuel Economy, Performance Energy Overall Width Example – Dimensional Flexibility Data Flow and Analysis Vehicle Width at Rocker