Reducing Aircraft Design Time Using FEA · Reducing Aircraft Design Time Using FEA. 5/22/2012...
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5/22/2012 Page 1 Presented by: Nick Mehlig Stress Engineer Structural Design and Analysis [email protected] Reducing Aircraft Design Time Using FEA
Transcript of Reducing Aircraft Design Time Using FEA · Reducing Aircraft Design Time Using FEA. 5/22/2012...
5/22/2012
Page 1
Presented by:
Nick Mehlig
Stress Engineer
Structural Design and Analysis
Reducing Aircraft
Design Time Using FEA
5/22/2012
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Meet the Presenters
Aswin JohnMarketing Specialist
703-935-2819
Aswin heads all marketing activities at
SDA. He promotes education in finite
element analysis and Siemens PLM and
HyperSizer software.
Nick MehligStress Engineer
703-935-2881
During his time at SDA, Nick has worked on
the Fokker D.VII Biplane, created breakout
models in Femap for the Orion Crew
Module, and used NX Nastran and
HyperSizer to size composite aircraft wings.
5/22/2012
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Vahana Project
• Carbon fiber Composite Aircraft
• Bonded Assembly
• eVTOL
• Electric Propulsion
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Vahana Project
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Structures.Aero Introduction
• Team of 12 Stress Engineers
• Experts in lightweight and load
efficient design
• Specializing in Aircraft, Spacecraft,
and Composite Structures
• On/Off-site Engineering Services
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Our Role
• Brought onto the project for stress
analysis
• Project Goals:
• Full-scale working Prototype
• Sized to lightest weight design
• Detailed Modeling
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Design Loop
Analysis &
Trade Studies
Results
Design UpdatesDesign
Group
Model Updates
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Analysis Process
Full Vehicle Analysis
Manufacturing & Structural Testing
Detailed Analysis
Initial Sizing
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Initial Sizing
• Hand analysis
• Coarse FEM
– Verify/tweak hand sizing
– Internal Loads
– Frequencies
• General structural layout
• Layup Schedules
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Detailed Analysis
• Detailed FEM
– Discrete Adhesive Bondlines
• Load spreading (Pressure Data Surface)
• Mesh Refinement/Break out models
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Manufacturing / Structural Testing
• Model test set up
• Provide deflections at customer
specified output locations
• Used to verify analysis, validate the
part strength, determine proper
equipment for testing
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Full Vehicle Analysis
• Load Spreading
– All load cases
– Inertial relief
– Asymmetric load cases
• Dynamic response
• Final Margins
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Reducing Design Time Using FEA
Modal Analysis
Load Spreading
Data Output & API
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Modal Analysis
• Propulsion system was not yet determined
• Component mass & CG affect mode shapes
and frequencies
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Load Spreading
• Flight Load Cases were a combination of Pressures and Motor Forces
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Data Output
• Input forces for each DOF at 12 unique locations
– 72 separate load cases
• Measure response at 3 different locations across frequency spread
– 735 frequencies x 12 output sets x 72 load cases = 635,040 data points!
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Special Offer
Try Femap and NX Nastran Free for 45-Days
SDA Exclusive:
All free trial sign-ups are sent tutorials and webinars to help learn Femap.
To get a 30 minute walkthrough with one of our Femap
experts, sign up at:
https://structures.aero/femap-trial
5/22/2012
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For questions on the material covered
today, please contact Nick.
For questions about Femap, training, or our
free informational materials, contact Aswin.
Contact Us
Aswin JohnMarketing Specialist
703-935-2819
Nick MehligStress Engineer
703-935-2881
