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