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Low Speed Airfoil Design. Joan Puig. Project Goals. Maximize L/D Easy to build Keep Cm at a value that is not going to make the airplane unstable Have space for a strong structure Design an optimal airfoil for my RC airplane. Tools. Panel Method to generate Cp distribution

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Presentation Transcript
project goals
Project Goals
  • Maximize L/D
  • Easy to build
  • Keep Cm at a value that is not going to make the airplane unstable
  • Have space for a strong structure
  • Design an optimal airfoil for my RC airplane
tools
Tools
  • Panel Method to generate Cp distribution
  • Shape adjusting function
  • Optimizer
  • Drag estimation tools (future work...)
shape adjusting function
Shape Adjusting Function
  • It generates any reasonable airfoil starting from a guess and a set of linerly independent bump functions.
optimization process review
Optimization Process Review
  • Don't assume anything about the input data
  • Fit the input data using a spline to the desired X coordinate values
  • Pass appropriate parameters to the optimization function
  • Collect data periodically
speed
Speed
  • Solving a matrix is o(n^3) -> most of the time is spent here
  • Try to be able to fit your matrix in the cache
    • 32*(n^2+8n)/(8*1024)<available cache ~128-512
  • Don't calculate x^2, x^3, sin(...) exp(...^n)... every time, compute them at the beginning and use them as global variables