Finite Burn Modeling

Spacecraft, Thruster, Tank, Propagator, CoordinateSystem, etc.

Finite Burn Modeling

Postby mstrain093 » Wed Mar 13, 2013 2:37 pm

Hey All,

I'm trying to move from an impulsive burn analysis to a finite burn, and I'm running into some troubles. Before, I'd vary all three directions of thrust (VNB) to achieve a certain lunar BdotT and BdotR. Each componant of the impulsive burn would have it's own vary command. Is there a way to do this with a finite burn?

I've set the burn time as a variable, and I start finite burn and propagate for that amount of time. All of this is within a target loop, again with some BdotT and BdotR set to achieve. I've tried setting the euler angles to vary, but this doesn't seem to be doing anything. There's also an option to vary the thrust direction of your Spacecraft.Thruster, but it doesn't seem like you can vary these parameters within the mission sequence.

Any ideas?

Thanks!
Mike
mstrain093
 
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Re: Finite Burn Modeling

Postby chancwj » Tue Jan 14, 2014 9:56 pm

In the 2013a version I'm running, you can vary the Spacecraft.Thruster.ThrustDirection1, 2 or 3. See attached screenshot.

I'm a year behind, just found out about GMAT and started playing with it.
Attachments
varydirection.png
chancwj
 
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