Download presentation
Presentation is loading. Please wait.
Published byLaurence Parks Modified over 9 years ago
2
Low Speed Airfoil Design Joan Puig
3
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
4
Tools ● Panel Method to generate Cp distribution ● Shape adjusting function ● Optimizer ● Drag estimation tools (future work...)
5
Shape Adjusting Function ● It generates any reasonable airfoil starting from a guess and a set of linerly independent bump functions.
6
Bad bump function choice
7
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
8
Guess
9
20 Iterations
10
40 Iterations
11
60 Iterations
12
Final Result
13
Convergence rate
14
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
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.