Lecture 10: Configurations Jason Mickey For AE 440 A/C Lecture September 2009
Configuration Responsibilities Design and determine the location, relationship and weights of primary component parts Calculate the center-of-gravity range and moments of inertia (to Stability) Integrate and control all external dimensions, including cross-sectional and plan-form aspects (wing data from Aerodynamics; non-wing data to Aerodynamics) Integrate all configurations with CAD renderings Get structural component dimensions and design and optimize remaining internal component placement
Design Considerations F-16 design included multiple weapons and multiple mission roles with high performance Key parameters included: -wing loading -thrust loading -control issues (at M~1 & M>1) -empty-weight fraction -pilot g tolerances
Design Considerations Grumman QSP Concept Selection
3-View Important quantitative aspect Located near the front Introduce overall features of the design
Design Considerations
F-18 Internal Configuration
X-32 3-D Solid Model Digital modeling reduces design rework, minimizes scrap, and significantly lowers assembly defects
Weights and Balances I xx, I yy, I zz About c.g. Needed for Stability
Center-of-gravity Travel Configure fuel system and payload placement to minimize travel
Systems Electrical Hydraulic Auxiliary Avionics
(AE 441) Electrical
(AE 441) Hydraulic
(AE 441) Auxiliary and Avionics Air Conditioners Bleed-air Avionics locations Cross-flow for engine restart
Samples of Configurations from Previous CDRs
AE View/Isometric View
AE 440 Selection Reasoning “The best LSA configuration for internal configuration reasons would be the LWT because having the fuel in the wings creates a more stable platform as it lowers the y-axis center of gravity which is discussed further in Section 6.4…”
AE 441 Final Configuration
Weight Buildup
CDR Suggestions Re-estimate aircraft weight/size every week Design deployment aspects & work with cost Incorporate data for external configuration Place components for internal configuration Communicate design problems and conflicts Get details on sub-systems size, weight, cost Trade studies: e.g. size vs. payload weight