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convexengineering / gplibrary

Useful subsystem models
MIT License
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initial try at HALE gas powered model #35

Closed mjburton11 closed 8 years ago

mjburton11 commented 8 years ago

This is a model for a high altitude vehicle that uses gas as it's energy source. Breguet range is the underlying model for time on station.

mjburton11 commented 8 years ago

Hey @whoburg I added a sketchy power vs. weight that we made here (based on small honda engine models): https://docs.google.com/spreadsheets/d/15_bX0Ub71fxrkyj72nUteMgjKj_mJw72Qi2RW3fag0I/edit?usp=sharing.

eta_t is my throttle variable because I figured that P_shaft would only be some percentage of the max power, which is what we graphed.

What do you think of this approach? Should we expand our engine database to include higher hp engines? Would appreciate any help.

mjburton11 commented 8 years ago

@whoburg just added a wind model and update the power weight curve. This could be useful to look at in class today. I'm send the files that have the wind curves and power vs weight curves to Oren, Reo and Kelly

bqpd commented 8 years ago

(great to see these! the wind model could use shear / a power law?)

whoburg commented 8 years ago

This is great! Added a commit moving the model to a .py file for better tracking of diffs in git; there's also a .ipynb alongside to run the model.

whoburg commented 8 years ago

Also @mjburton11 I would recommend looking at the data sheet Prof. Drela sent for gas engine sizing.