NTNUJAVA Virtual Physics Laboratory
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Author Topic: Satellite motion  (Read 16343 times)
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Fu-Kwun Hwang
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on: August 28, 2007, 03:34:20 pm »

You will find two simulations for satellite motion due to the gravitation force between satellite and massive object(center one with cyan color).
Which one is the correct simulation? The one will rotate or another one which does not rotate?

You can pause the simulation. Change the location or velocity of the satellite when velocity vector is visiable, then press 'play' button again. Enjoy it!
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lookang
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Reply #1 on: September 05, 2007, 12:23:15 am » posted from:Singapore,,Singapore

Hi prof hwang,

Q1: can you demonstrate how to wrap a world map onto the circle(sphere) in 3D view ?
http://science.nasa.gov/Realtime/JTrack/3d/JTrack3D.html

there is a non rotating Earth


many people can't visualize the meaning of geostationary orbit, i hope to help make an applet.

Q2: why is the xml file you declare GM = R*R instead of using the G = 6.67*10^-11 and M = 6.0x10^24 ?

the rest still thinking, those i know i post here for others to learn  Grin


Model constraint page:
cta=-Math.atan2(x,y); // cta is angle of satellite from origin which is earth comment lines by weelk
r=Math.sqrt(x*x+y*y); // r is radius of rotation comment lines by weelk
if(r>xmax*scale)scale=r*1.2/xmax; // just a way the scale the simulation 1.2 times bigger if the radius in getting bigger than xmax*scale instead of autoscale all the time comment lines by weelk

Model custom page:
double r,r2,r3,cst;
public double getA (double x, double y) {
 r2=x*x+y*y; 
 r3=r2*Math.sqrt(r2);
 return -GM*x/r3; //clever way of function getA (x,y) acceleration along each axis comment lines by weelk
}


I was hoping i can modify your codes to make a realistic earth with satellite in 3D view.

i will later add potential versus distance, mass of satellite changeable.

and others can use your template to make applets to suit their needs.  Grin
 
thanks
« Last Edit: September 05, 2007, 12:36:36 am by lookang » Logged
Fu-Kwun Hwang
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Reply #2 on: September 06, 2007, 10:08:36 pm »

The applet created by NASA was running with real time data. That is a good resource.
I believe their world map was draw with available data. It is not a combination of a static graphs in a 3D environment.
If you can find data for the earth surface. You can draw it with polygon element easily.

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lookang
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Reply #3 on: September 06, 2007, 10:23:50 pm » posted from:Singapore,,Singapore

i like easy!!!

data refers to graphics ?
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Fu-Kwun Hwang
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Reply #4 on: September 06, 2007, 10:38:35 pm »

No. Because it is a 3D view of the earth surface. So it was not generate by combination of static graph.
I believe they have all the data for the earth surface. And draw those data points when you change the view angle. I believe the data exists somewhere on the net. But I did not know where it is. And I do have time to search for that now.
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