System level PDN analysis enhancement including I/O Subsystem Noise modeling
Subsystem Level Design Review. Project Review System Level Changes ◦ Tail Dragger ◦ Airfoil...
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Transcript of Subsystem Level Design Review. Project Review System Level Changes ◦ Tail Dragger ◦ Airfoil...
P16121: SAE Aero Aircraft Design & Build
Subsystem Level Design Review
Project Review System Level Changes
◦ Tail Dragger◦ Airfoil Change and Discussion
Subsystem Selection◦ Fuselage Structure◦ Wing Material◦ Wing Construction◦ Landing Gear Selection◦ Tail Mounting
Aerodynamic Design, Sizing, and Static Stability◦ Aerodynamic Wing Design and Sizing◦ Horizontal Stabilizer Sizing and Longitudinal Static Stability◦ Vertical Stabilizer Sizing and Directional Static Stability ◦ Updated Take-off and landing◦ Testing Plan
Agenda
RIT Aero Design Club has been absent from the SAE Aero competition (Regular Class) since 2008◦ Prior to 2008, RIT had been inconsistent in participating in the
competition annually
Lacking…◦ Experienced veterans to lead/guide the club◦ Aeronautical engineering experience/knowledge◦ Full commitment as students are on co-op for parts of the year◦ Funding
Current State
Deliverables◦ A functional finished aircraft designed and built to SAE Aero standards◦ Comprehensive documentation of design, build, and testing methods and
processes
Jumpstart the Aero Club◦ Build competence through sharing experience from the present Senior Design
project◦ Desired State: Aero Design club is able to compete in the SAE Aero Competition
annually and be competitive
Desired State/Deliverables
Progress and Time Keeping
Objectives Targeted in this Phase
Objectives targeted from functional decomposition◦ Aircraft must have enough lift to fly◦ Aircraft must be stable and controllable◦ Aircraft must survive landing
Other Design Targets this Phase
Bill of Materials
Donated Materials
System Level Changes
More desirable α for takeoff for S1223 airfoil Support of front landing gear more directly
supporting the payload bay Benefits for meeting our dimensional constraints Tail strike during landing now a designed for risk Challenges:
◦ Additional bending stress during takeoff and landing on the tail boom
◦ Propeller strike during landing now more serious risk◦ E423 airfoil less generous in acceptable range of α
Taildragger Configuration
S1223 vs. E423
A tale of two airfoils
S1223E423
Pro or Con Detail:
+ Higher Cl
+ Designed for low Re
+ Cruise α more forgiving for stall characteristics
- Cmac very high
- CD high
- Manufacturing challenges
Pro or Con Detail:+ Cmac lower
+ Easier to trim
+ Smaller tail allows for more lifting area
- Lower Cl
- Flight conditions outside of traditional flight regime
+ Thicker trailing edge is easier to manufacture
+ At a particular angle of attack E423 generates more lift and less drag
Subsystem Selection
Fuselage Truss
Platform
Keel
Wing Material
Foam
Balsa
3D-Printed
Wing SectionOne Piece
Two Piece
Two Piece w/ Wingbox
Landing Gear
Tail MountingBottom
Middle
Wingbox
Feasibility and Analysis
Testing: Reinforced Trailing Edge Thin trailing edge on
S1223 wing configurations has a high risk of snapping
3D printed trailing edges would increase strength without too much of a weight increase
An estimate to get the order of magnitude for expected impact loading
We will want to design for impacts in the range of a thousand pounds
Landing Impact
An estimate to get the order of magnitude for expected bolting strength in the fuselage
We should be able to design for considerable strength
Bolting Strength
Aerodynamic Wing Design and Sizing: Parameter Selection
Horizontal Stabilizer Design: Parameter Selection
Longitudinal Static Stability Sizing Diagram
Preliminary Fuselage Sizing Diagram:Static Stability and Internal Storage Requirements
Horizontal Stabilizer Design: Overall Geometry
Overall Aircraft Longitudinal Static Stability
Vertical Stabilizer Design: Parameter Selection
Vertical Stabilizer Design: Overall Geometry
Overall Aircraft Directional Static Stability
Updated Take-Off and Landing Performance
Plan for continuing testing
Questions?