NTNUJAVA Virtual Physics Laboratory
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Easy Java Simulations (2001- ) => Dynamics => Topic started by: Fu-Kwun Hwang on July 22, 2011, 04:46:28 am



Title: Satellite motion in 3D
Post by: Fu-Kwun Hwang on July 22, 2011, 04:46:28 am
The default status for the simulation is a synchronized satellite.

(http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=2245.0;attach=4335;image)

You can drag the arrow to change it's velocity when it is paused.

Click reverse button to change it's direction (opposite direction with same speed).

Please noticed that the satellite itself did not rotate when it is moving around the earth.
Enjoy it!


Title: Re: Satellite motion in 3D
Post by: lookang on July 22, 2011, 08:02:41 am
awesome!
your posted simulation will be studied perhaps even adopted to be the base template for another applet that i have been working on http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1877.0 Ejs Open Source Geostationary Satellite around Earth Java Applet.

or on another simulation http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2204.0 Ejs Open Source Newton's Mountain Projectile Orbits Model java applet
i actually tried to add 3D into my remixed simulation but the Ejs failed to render the 3D parts of the model, only 2D seems to work.
i abandon the modification (mods) because i could not figure out the problem with the xml or Ejs itself could not generate such a complex multiple view of 2D and 3D select-able.


i should be a ble to enhance them all
1. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1877.0 Ejs Open Source Geostationary Satellite around Earth Java Applet (http://1.bp.blogspot.com/-ofiuvIwCBeM/TgYBLGjw_4I/AAAAAAAAAts/QLAyUtkhvc8/s320/Ejs+Open+Source+Geostationary+Satellite+around+Earth+Java+Applet.png)
2. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2204.0 Ejs Open Source Newton's Mountain Projectile Orbits Model java applet (http://4.bp.blogspot.com/-vJbz1C1lafA/Tg14G0zFwrI/AAAAAAAAAvE/lNXb5KlHPRw/s320/Ejs_Open_Source_Newton%2527s_Mountain_Projectile_Orbits_Model_java_applet.png)

a little more, thanks to your newly released physics simulation on Satellite motion in 3D.

thanks!


Title: Re: Satellite motion in 3D
Post by: ahmedelshfie on July 22, 2011, 05:28:55 pm
Nice applet, i like 3d panel, well i modified applet that already created by prof Hwang, and but is not 3d is 2d http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2244.0 (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2244.0)

(http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=2245.0;attach=4338;image)
I add image to the earth and do a slow rotation for earth, but i believe im gonna to add more options may also add 3d panel, need only some time to study more about satellite motion. :)


Title: Re: Satellite motion in 3D
Post by: lookang on July 22, 2011, 06:28:51 pm
Well done ahmed, the power to create/remix knowledge and simulation is indeed possible now in this forum.
Glad you have evolve your learning to add more options.
Keep in the good work everyone! :)

Anyway
I been adding new animated gif into wikimedia and Wikipedia.
So far, the Wikipedia community has not deleted my animated gif from the Wikipedia pages.
 :)

U can see animated gif on several pages now.
Try the solar systems, planets, gimbal lock, collisions, momentum, vernier caliper, micrometer .

Power to the ejs community!!



Title: Re: Satellite motion in 3D
Post by: ahmedelshfie on July 22, 2011, 08:22:43 pm
Thanks  :), you right is really powerful that create/remix knowledge with simulation, and prof Hwang he the hero.
 
Question:- do you think movement of the earth is slowly or this velocity is good? i believe velocity is fine but just for confirm.


Title: Re: Satellite motion in 3D
Post by: lookang on July 22, 2011, 08:40:39 pm
Yes the velocity is suitable.
U may want to figure out how to add a time variable
So that the earth rotates one full round cta = 2*PI in t = 24 hours.
Try it!
It is fun :)


Title: Re: Satellite motion in 3D
Post by: ahmedelshfie on July 23, 2011, 12:24:47 am
Quote
U may want to figure out how to add a time variable
So that the earth rotates one full round cta = 2*PI in t = 24 hours.
Try it!

Can be some more details to add time. :)


Title: Re: Satellite motion in 3D
Post by: ahmedelshfie on August 01, 2011, 05:17:02 pm
I receive E-mail from prof Wolfgang Christian about Satellite motion applet, i was already contact OSP to if may they like to post the applet that i modified in their website, i need to understand how to modified the applet to be like what Wolfgang Christian suggest, here the E-mail.

Quote
Dear Ahmed—

Thank you for sending me your model.

The applet is very nice and shows how to include images in EJS model.  The images add a lot of realism but this realism may suggest that the scale is correct.   I am worried about the incorrect scale of the satellite image relative to the Earth and the orbital radius of the satellite.  Also, the axis of rotation is not the North Pole.

Wolfgang

I need help to understand this part
Quote
I am worried about the incorrect scale of the satellite image relative to the Earth and the orbital radius of the satellite.  Also, the axis of rotation is not the North Pole.

Thanks in advance