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MATLAB Simulation
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Updated Simulation
January 17, 2008
Simulation files
Click below to download: File:Sim 2007 Oct 1.zip
To run a simulation:
- Check out motors.m, if the motor you want isn't there, add it.
- Edit vehiclesetup.m to reflect the vehicle parameters - the file in the zip is set up for something approximately like our guess at a competition rocket.
- Edit drag.m if you want to change the Cd or perhaps vary it with airflow characteristics
- Type
GRAPH_SUPPRESS=0(or 1 if you don't want a whole pile o' graphs) - Type
simulate
Other useful files in this zip:
- Atmosphere.m - a recent, accurate model of the atmosphere (pressure, density, temperature, speed of sound) at high altitudes
- balloonlift.m - a very rough and untested model of how much a balloon can lift, but maybe a useful starting point for something better
Henry (hallam at mit dot edu) wrote all of this apart from the Atmosphere code, so ask him if it's confusing.
Results
Simulation State Variables:
- engine size/hybrid?
- nose cone design
- fins, deployable?
- nozzle modification
- geometry (tube dia, length)
- structural mass, material
- payload mass
- sensor system: airdata, LINS (inertial nav system)
- data rate (balloon relay?)
- recovery mass
- launch system: first stage/piston system
- launch angle
Constraints:
Competition
- descent rate
- ballistic coeff: 12 lb/in^2
- I_max = 200,000s
- comm system
Internal
- CU Spaceflight: max mass
- $$
- Ignition Delay
<math>Insert formula here</math>