MATLAB Simulation

Updated Simulation

File:Simulation.zip

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

Media:rocket_sizing.xls

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>