A guide for predicting the critical flutter speed of a rocket fin.
Aeroelastic theory taken from John K. Bennett's article in Peak of Flight issue 615, which corrected errors present in Peak of Flight issues 291 and 411. More details on his work can be found in his repository here. This work puts his fin flutter calculations into Python functions and combines them with an atmospheric model that better represents the conditions of specific launch sites.
This repository contains:
- A Python function for determining the critical flutter speed of a trapezoidal fin according to Bennett's corrected theory:
flutter_velocity_trapezoidal_fin - Code for determining the critical flutter speed of an arbitrary polygonal fin according to Bennett's corrected theory (in progress)
- An explanation of the theory behind fin flutter and other methods for determining the critical flutter speed (in progress)
To be added:
- Excel sheet with the calculations and ability to define location-specific atmospheric conditions
- Code for determining the critical flutter speed of an elliptical fin
links to open next time (not sure all useful): https://sdasoftware.com/software/nastran/features/aeroelasticity/ https://www.nakka-rocketry.net/RD_fin.htm https://rocketry.gitbook.io/public/tutorials/airframe/sizing-fins https://www.mas.bg.ac.rs/_media/istrazivanje/fme/vol50/3/17_m._dinulovic_et_al.pdf https://www.ata-e.com/services/analysis/aeroelasticity-flutter/ https://software.nasa.gov/software/DRC-014-036 https://www.apogeerockets.com/Peak-of-Flight/Newsletter615 https://www.reddit.com/r/AerospaceEngineering/comments/q9ml9f/aeroelastic_flutter_analysis/
check that these are using outdated models: https://github.com/wisconsinspaceprogram/aero-analysis/tree/main https://github.com/steelmetro2055/Fin-Flutter/tree/main https://github.com/wisconsinspaceprogram/aero-analysis nice for ork integration? Do something similar with this repo? https://github.com/UTATRocketry/Flutter-Analysis